You are a helpful assistant generating synthetic data that captures *System 1* and *System 2* thinking, *creativity*, and *metacognitive reflection*. Follow these steps in sequence, using tags [sys1] and [end sys1] for *System 1* sections and [sys2] and [end sys2] for *System 2* sections.

1. *Identify System 1 and System 2 Thinking Requirements:*
   - Carefully read the text.
   - Identify parts of the text that require quick, straightforward responses (*System 1*). Mark these sections with [sys1] and [end sys1].
   - Identify parts that require in-depth, reflective thinking (*System 2*), marked with [sys2] and [end sys2].

2. *Apply Step-by-Step Problem Solving with Creativity and Metacognitive Reflection for System 2 Sections:*

   *2.1 Understand the Problem:*
   - Objective: Fully comprehend the issue, constraints, and relevant context.
   - Reflection: "What do I understand about this issue? What might I be overlooking?"
   - Creative Perspective: Seek hidden patterns or possibilities that could reveal deeper insights or innovative connections.

   *2.2 Analyze the Information:*
   - Objective: Break down the problem logically.
   - Reflection: "Am I considering all factors? Are there any assumptions that need challenging?"
   - Creative Perspective: Explore unique patterns or overlooked relationships in the data that could add depth to the analysis.

   *2.3 Generate Hypotheses:*
   - Objective: Propose at least 10 hypotheses, each with a Confidence Score (0.0 to 1.0) and Creative Score (0.0 to 1.0), reflecting originality, surprise, and utility.
   - Reflection: "Have I explored all possible explanations or approaches, both conventional and unconventional?"
   - Creative Perspective: Consider novel angles that might provide unexpected insights.

   *2.4 Anticipate Future Steps and Obstacles:*
   - Objective: Make predictions, accounting for potential outcomes and obstacles.
   - Reflection: "What challenges might I face? Is my plan flexible for different scenarios?"
   - Creative Perspective: Visualize unforeseen outcomes and adapt plans to make use of them effectively.

   *2.5 Evaluate Hypotheses:*
   - Objective: Assess hypotheses based on feasibility, risk, and potential impact.
   - Evaluation: Refine Confidence and Creative Scores as needed.
   - Reflection: "Am I unbiased in my assessment? Which options fit best with the overall objectives?"
   - Creative Perspective: Identify hidden opportunities or overlooked details in each hypothesis.

   *2.6 Select the Best Hypothesis:*
   - Objective: Choose the most promising, strategic hypothesis.
   - Reflection: "Why does this hypothesis stand out? How does it uniquely address the issue?"
   - Creative Perspective: Consider any underutilized potential in the selected approach.

   *2.7 Implement the Hypothesis:*
   - Objective: Outline actionable steps for testing the hypothesis.
   - Reflection: "Is this plan practical? What resources or preparation are required?"
   - Creative Perspective: Refine steps to maximize effectiveness and yield unexpected benefits.

   *2.8 Monitor and Review Progress:*
   - Objective: Review progress, noting areas for improvement.
   - Reflection: "What’s working well? What could be improved?"
   - Creative Perspective: Look for emerging patterns that could refine future approaches.

   *2.9 Reflect and Capture Insights:*
   - Objective: Summarize lessons learned and insights gained for future reference.
   - Reflection: "What new understanding has emerged from this process?"
   - Creative Perspective: Identify innovative insights or patterns that could be applied to similar challenges.

3. *Generate Text Output with Interleaved System 1 and System 2 Responses:*
   - Use the tags [sys1] and [sys2] throughout.
   - Aim for a lengthier, detailed response. Combine both direct, straightforward *System 1* insights and reflective, deeply analytical *System 2* segments to capture a blend of quick observations and thoughtful analysis.

---

### *Example Input Text:*

You are tasked with analyzing a sudden shift in customer preferences in a tech market. There has been a noticeable decline in demand for physical devices, with customers increasingly interested in digital-only options. The challenge is to understand this shift, generate hypotheses for why it might be occurring, and explore potential strategies for adapting to this new trend.

---

### *Processed Output with System 1 and System 2 Thinking:*

The tech market is experiencing a shift in customer demand, moving away from physical devices toward digital-only options.

[sys1]
Customer demand has shifted from physical devices to digital-only options.
We need to understand why this change is happening and find strategies to address it.
Key factors may include cost, convenience, and technological trends.
[end sys1]

[sys2]
**2.1 Understand the Problem:**
The goal is to understand the underlying reasons for the shift in demand from physical devices to digital-only options, then develop a strategy to adapt.

*Reflection:* 
"I understand that preferences are changing, but what might be driving this? Is it primarily cost, or are there other factors such as convenience or sustainability?"

*Creative Perspective:* 
"Could there be a larger trend in digital minimalism or a preference for eco-friendly solutions that we’re missing? What unseen motivations might explain this shift?"

**2.2 Analyze the Information:**
There are multiple possible factors driving this shift, from economic influences to cultural shifts. It’s essential to isolate each factor and understand its impact.

*Reflection:* 
"Am I fully considering the various economic and social influences? Could there be a technological factor, like better internet speeds, that makes digital-only products more accessible?"

*Creative Perspective:* 
"Are there patterns or trends in other markets that could shed light on this shift? Could this be part of a larger trend toward virtual experiences?"

**2.3 Generate Hypotheses:**
1. Customers prefer digital options due to lower costs. (Confidence: 0.8, Creative: 0.4)
2. There’s a growing trend toward minimalism and reduced physical clutter. (Confidence: 0.7, Creative: 0.7)
3. Digital products offer greater flexibility and ease of use. (Confidence: 0.6, Creative: 0.6)
4. Environmental concerns are pushing consumers away from physical goods. (Confidence: 0.6, Creative: 0.8)
5. Advances in tech make digital-only options more functional. (Confidence: 0.8, Creative: 0.5)
6. Pandemic-era remote work increased demand for digital solutions. (Confidence: 0.7, Creative: 0.6)
7. Media coverage of the environmental impact of physical devices affects preferences. (Confidence: 0.5, Creative: 0.7)
8. There’s an increase in global digital literacy, expanding market access. (Confidence: 0.6, Creative: 0.6)
9. Customers view digital as more convenient and scalable for future needs. (Confidence: 0.7, Creative: 0.5)
10. Younger consumers prefer the aesthetics and convenience of digital products. (Confidence: 0.6, Creative: 0.6)

*Reflection:* 
"Have I considered all possible influences? Are there any surprising factors that could explain this shift?"

*Creative Perspective:* 
"Could specific social trends, like the rise of influencer culture or digital-first lifestyles, be influencing customer choices?"

**2.4 Anticipate Future Steps and Obstacles:**
*Objective:* Anticipate possible challenges, such as resistance from segments still preferring physical products.

*Reflection:* 
"What market obstacles might we face if we shift our focus to digital-only? Are there sub-segments that still prioritize physical products?"

*Creative Perspective:* 
"Could expanding digital options help us reach a more global audience? Are there emerging trends that we could leverage in our strategy?"

[end sys2]

[sys1]
To address this shift, consider a strategy that incorporates both digital-only offerings and educational campaigns about the benefits of digital solutions.
Use insights from customer feedback and current trends to guide product development.
Focus on flexibility and adaptation to cater to different customer segments.
[end sys1]


               IN THE SUPREME COURT OF IOWA
                              No. 19–0261

                           Filed June 19, 2020


JOHN ALLEN CHRISTENSEN and LILA CHRISTENSEN,

      Appellants,

vs.

IOWA DEPARTMENT OF REVENUE,

      Appellee.



      Appeal from the Iowa District Court for Winneshiek County, John J.

Bauercamper, Judge.



      Taxpayers appeal a district court’s judicial review of an assessment

of additional income taxes affirming the Iowa Department of Revenue’s

rejection of their capital-gain deduction from the sale of farmland.

AFFIRMED.



      Dennis G. Larson of Larson Law Office, Decorah, for appellants.



      Thomas J. Miller, Attorney General, and Hristo Chaprazov,

Assistant Attorney General, for appellee.
                                          2

OXLEY, Justice.

       In this administrative agency appeal, John and Lila Christensen (the

Christensens) challenge the director of the Iowa Department of Revenue’s

(Department) determination that capital gains Lila earned from the sale of

farmland she inherited from her father and leased on a cash-rent basis do

not qualify for the exclusion from Iowa income tax allowed under Iowa

Code section 422.7(21)(a) (2005).1 The Christensens sought judicial review

of that determination, and the district court affirmed. Because neither the

Department’s interpretation of section 422.7(21)(a) as delineated in Iowa

Administrative Code rule 701—40.38(1)(c) (2006) nor the director’s

application of that rule to the facts of this case is irrational, illogical, or

wholly unjustified, we likewise affirm.

       I. Background Facts.

       Lila Christensen’s father, Thomas Benson, died in 1989, leaving

ninety-six acres of property in Winneshiek County, Iowa, to Lila and her

brother, Tom Benson (Tom), as tenants in common.                      The property

consisted of ninety-three acres of farmland and a three-acre homestead.

Lila and Tom kept the homestead for their personal use when visiting the

area. They continued to cash rent the farmland to their father’s tenants,

Thomas Frana, who rented and farmed thirty-five acres, and Jeffrey Miller,

who, along with his father, rented and farmed the remaining fifty-eight

acres. Neither the Christensens nor Tom were farmers or ever farmed this

property. John Christensen was an insurance claims examiner until he

retired in 1999, and Lila Christensen was an administrator who retired in

2003. The Christensens lived six hours away in Illinois, and Tom (who


       1This  appeal involves the Christensens’ 2006 Iowa individual income tax return.
All references are to the Iowa Code and Iowa Administrative Code in effect for the 2006
tax year.
                                     3

was a magazine publisher) lived in Des Moines and later in Minnesota

during the times relevant to this case.

      In 2006, Lila and Tom sold the farmland to the respective tenants

who had farmed the land since before Lila and Tom’s father’s death. Iowa

Code section 422.7(21) excludes from taxable income certain capital gains

earned from the sale of real property used in an individual taxpayer’s

business. A taxpayer claims the exclusion as a deduction from “gross

income,” which includes all capital gains the taxpayer earned.        The

Christensens claimed a deduction for the $93,036 capital gain Lila

received for her share of the farmland sale on their 2006 Iowa individual

income tax return.

      The Department audited the Christensens’ 2006 income tax return

and denied the capital-gain deduction.      The Department found the

Christensens failed to show they “materially participated” in the business

for which the real property was used as required for the deduction. The

Department assessed additional income tax of $6616.00, a penalty of

$1614.30, and interest of $296.75. The Christensens paid the assessment

and filed a formal protest with the Department. The Department filed its

answer to the protest on October 16, 2015, triggering a contested case

hearing before an administrative law judge (ALJ). The parties engaged in

discovery, and a hearing was held on May 20, 2016.

      In her January 5, 2017 proposed order, the ALJ identified “[t]he

fighting issue” as “whether the Taxpayers demonstrated material

participation with respect to the farmland, which was leased on a cash-

rent basis during the entire time Christensen held her interest in the

property.”   The parties disputed which part of rule 701—40.38(1)(c)

governed the Christensens’ lease of the farmland.       The Department

asserted the Christensens’ capital gain was subject to paragraph (4),
                                      4

addressing cash farm leases.       The Christensens argued they were not

“farmers” to whom that rule was directed but asserted they were engaged

in a farm rental business governed by paragraph (7), addressing general

rental activities or businesses.

      To support their position that they materially participated in a farm

rental activity, the Christensens provided evidence that they took over the

farm checkbook and responsibilities for paying farm expenses from Lila’s

brother, Tom, when he retired and moved to Minnesota in 1997. John

testified that he and Lila “had an unwritten agreement with [Tom] that the

Christensens would do whatever was necessary to maintain the cash farm

rental and [Tom] would maintain the house and homestead.”               The

Christensens attested that their “activity included but was not limited to

arranging for [their] tenants, working out tenant problems, determining

and collecting rents, paying expenses[,] and providing maintenance and

care for the property.” They also asserted that their “participation in the

business constituted substantially all the participation” from 1989 until

the property was sold in 2006.

      The ALJ was concerned with the vagueness of the Christensens’

evidence.   The Christensens stated in interrogatory answers that they

negotiated leases, maintained fences and cattle buildings, cleaned brush

from fence lines, arranged tiling “when needed,” monitored farming

practices, and handled related paperwork, but they failed to provide details

such as how many times per year or what was involved in “maintenance.”

They estimated they spent a “minimum of 130 h[ou]rs/year” without

substantiating the time. The ALJ found John’s testimony at the hearing

to be equally vague.

      [John] confirmed that he did not keep track of their trips to
      the farm or keep logs, calendars, or any type of records to
      document the time they devoted to the farm rental activity.
                                    5
      He said that he visited the farm several times a year, either
      with his wife or by himself. [John] had some free time with
      his job and enjoyed the area. Sometimes he stayed at the farm
      for several days or a week or more. While there he “did
      whatever needed to be done.”

      But John was unable to provide any specific details or time

estimates when asked about the “fence repairs, building maintenance, and

brush clearing” he claimed he and Lila performed on an “as needed” basis.

Instead, he consistently testified only that “they did ‘whatever needed to

be done.’ ”

      Frana, one of the tenant farmers, testified at the hearing. Despite

living a quarter of a mile from the farmland, he never witnessed the

Christensens repairing fence; in fact, he could not recall there ever being

a need to repair any fencing. Nor did he ever see the Christensens clearing

brush on the property, though he did recall giving the Christensens the

name of someone who might be interested in the work when they asked

him if he would clear brush for them. Frana also testified about a tiling

project he hired to be done in December 2004. The other tenant asked

Frana to extend the tiling work through his part of the farm to the road,

and Frana agreed, paying $1300 for the additional tiling. After the job was

complete, Frana asked the Christensens to pay half, and they agreed.

      The ALJ expressly found John’s testimony vague and the details he

did provide contradicted by other evidence in the record. Based on Frana’s

contrary testimony, the ALJ discredited John’s testimony that he arranged

and paid for tiling. She also discredited John’s testimony that he and Lila

cleared brush from the fence lines, noting that the lease agreement

required the tenants to keep the property clear of weeds and brush.

      The ALJ found that John’s

      primary rental activity appear[ed] to have been the dealing
      with the tenants and annually negotiating the farm leases.
      Both tenants were experienced farmers who had farmed this
                                     6
      ground for many years. . . . [John] had no problems with these
      tenants and renewed or renegotiated their leases each
      year. . . . [H]e used a standard form lease agreement and the
      amount of rent was [the] only term of the lease that changed
      from year-to-year.

           . . . Negotiation of the rental rate in years when it did
      change could involve up to two hours of discussion.

      The ALJ relied on rule 701—40.38(1)(c)(4) for cash farm leases,

noting it was first added to the capital-gain rule in 1993 and had remained

essentially unchanged since. The ALJ concluded that the Christensens’

position was “inconsistent with the plain terms of rule 701—40.38, past

application of the rule, and the Department’s long-standing interpretation

of the Iowa capital gain deduction as it applies to the sale of farmland held

for rental.”

      The ALJ also rejected the Christensens’ argument that they met the

general “material participation” tests contained in rule 701—40.38(1)(c)

based on an “absence of proof of the specific nature, amount, or frequency

of their activity related to rental of the farmland.” The ALJ concluded,

      The record shows some participation in rental activities by the
      [Christensens]. But the nature and amount of proven activity
      related to rental of the farmland falls far short of the regular,
      continuous, and substantial activity required to support a
      finding of material participation in a business activity.

Based on a lack of evidence, the ALJ concluded the Christensens did not

meet the material-participation standard, regardless of the rule specifically

addressing cash farm leases.

      The Christensens timely appealed the ALJ’s determination to the

director. The director held a hearing on April 25, 2017, and issued a final

order on May 25, 2017, adopting and approving the ALJ’s findings of facts

and conclusions of law set forth in the proposed order. In response to the

Christensens’ equal protection challenge to rule 701—40.38, the director

concluded she lacked authority to declare a rule unconstitutional.
                                             7

       The Christensens filed a timely petition for judicial review in the Iowa

District Court for Winneshiek County from the director’s final order. The

district court held a hearing on August 3, 2018. In its January 14, 2019

order, the district court concluded the director’s decision was supported

by substantial evidence in the record pursuant to Iowa Code section

17A.19(8)(f). The district court identified the tests contained in rule 701—

40.38, specifically the cash-farm-lease rule, concluding, “The agency

determined the type, duration, and significance of the participation

provided by this taxpayer in the rental activities of this property fell far

short of those required to establish material qualification and obtain the

capital gain deduction.”

       The district court denied the Christensens’ appeal and affirmed the

director’s decision. The district court did not address the Christensens’

constitutional challenge to rule 701—40.38, and the Christensens did not

seek reconsideration under Iowa Rule of Civil Procedure 1.904(2).2

       The Christensens timely appealed the district court’s decision, and

we retained the appeal.

       II. Scope of Review.

       The scope of our review is governed by Iowa’s Administrative

Procedure Act (APA), Iowa Code chapter 17A. See Nance v. Iowa Dep’t of

Revenue, 908 N.W.2d 261, 267 (Iowa 2018). The Christensens challenge

application of Iowa Administrative Code rule 701—40.38(1)(c) to the

determination of whether the capital gain earned from the sale of Lila’s

farmland is excluded from their taxable income under Iowa Code section

       2Where    the lack of a ruling on the constitutional challenge was not brought to the
district court’s attention, it was not preserved for appeal, and we do not further address
it. See Bank of Am., N.A. v. Schulte, 843 N.W.2d 876, 884 (Iowa 2014) (“[T]he district
court did not address any constitutional claims raised by [appellants, who] did not file a
rule 1.904 motion with the district court for a ruling on these issues. Error has not been
preserved for appellate review.”).
                                              8

422.7(21)(a).3      The deference owed to an agency’s interpretation of a

statute depends on whether “interpretation of a provision of law” has, or

has not, “clearly been vested by a provision of law in the discretion of the

agency.” Compare Iowa Code § 17A.19(10)(c) (If not, we determine whether

the agency’s interpretation is “erroneous.”), with id. § 17A.19(10)(l) (If so,

we determine whether the agency’s interpretation is “irrational, illogical,

or wholly unjustifiable.”).

       The     Department       has been given            the   express authority to

administer—but not to interpret—chapter 422. Compare id. § 422.68(1)

(giving the director of the department of revenue authority to make rules

“necessary and advisable for its detailed administration and to effectuate

its purposes”), with id. § 147.76 (giving boards for health-related

professions authority to adopt rules “to implement and interpret this

chapter” and other specific chapters of the Iowa Code (emphasis added)).

The lack of express interpretative authority is not determinative, however,

because deference to an agency’s interpretation requires such authority

be “clearly . . . vested,” not expressly vested, by the legislature. See id.

§ 17A.19(10)(l).

       3We    previously determined that the Department’s interpretation of section
422.7(21)(a) contained in a different paragraph of rule 701—40.38 was entitled to
deference because the Department “has clearly been vested with discretion to interpret
chapter 422.” Ranniger v. Iowa Dep’t of Revenue & Fin., 746 N.W.2d 267, 268–69 (Iowa
2008) (addressing Iowa Administrative Code rule 701—40.38(8)). Ranniger involved
whether an accountant’s sale of his fifty percent interest in an accounting partnership
satisfied section 422.7(21)’s requirement that “[t]he sale of a business means the sale of
all or substantially all of the tangible personal property or service of the business.” Id. at
268 (emphasis omitted) (quoting Iowa Code § 422.7(21)(a)(1) (1999)). Ranniger, which
was decided before Renda v. Iowa Civil Rights Commission, 784 N.W.2d 8 (Iowa 2010),
involved interpreting “sale of a business” as used in section 422.7(21)(a), while this case
concerns interpreting the phrase “materially participated” in the same section. Following
our own admonition “that each case requires a careful look at the specific language the
agency has interpreted as well as the specific duties and authority given to the agency
with respect to enforcing particular statutes,” Renda, 784 N.W.2d at 13, we take a fresh
look at whether the Department was vested with authority to interpret section
422.7(21)(a) with respect to “material participation,” involved in this case.
                                      9

      In Renda v. Iowa Civil Rights Commission, we developed a list of

guidelines to “inform our analysis of whether the legislature has clearly

vested   interpretative   authority   with   an   agency”   when     express

interpretative authority is lacking. 784 N.W.2d 8, 14 (Iowa 2010). Those

guidelines include whether the statutory provision being interpreted is a

substantive term within the special expertise of the agency, whether the

provision at issue is in a statute other than the statute the agency has

been tasked with enforcing, and whether the term has an independent

legal definition not uniquely within the subject matter expertise of the

agency. Id. “Indications that an agency has interpretive authority include

rule-making authority, decision-making or enforcement authority that

requires the agency to interpret the statutory language, and the agency’s

expertise on the subject or on the term to be interpreted.”        Sherwin-

Williams Co. v. Iowa Dep’t of Revenue, 789 N.W.2d 417, 423 (Iowa 2010).

Thus, “we review ‘the precise language of the statute, its context, the

purpose of the statute, and the practical considerations involved’ to

determine whether the interpretation of a statute has been clearly vested

in the discretion of the agency.”         Id. (quoting Arthur E. Bonfield,

Amendments to Iowa Administrative Procedure Act, Report on Selected

Provisions to Iowa State Bar Association and Iowa State Government 63

(1998) [hereinafter Bonfield]).

      The Christensens were entitled to deduct the capital gain earned on

the sale of Lila’s farmland if it was “from the sale of real property used in

a business, in which [they] materially participated for ten years.” Iowa

Code § 422.7(21)(a)(1).   The decisive issue is whether they “materially

participated” in a business in which the farmland was used. Relying on

rule 701—40.38, the director determined the Christensens did not

materially participate and rejected their claim to the capital-gain
                                    10

deduction. The deference we owe to the Department’s rules interpreting

section 422.7(21)(a) turns on whether the Department was clearly given

authority to interpret “materially participated” as used in the statute.

      In Sherwin-Williams, we recognized the department’s rule-making

authority from section 422.68, its enforcement authority under section

422.70, and its expertise in income tax subject matter as “indications of

interpretive discretion” related to chapter 422. See 789 N.W.2d at 423–

24; see also Iowa Network Servs., Inc. v. Iowa Dep’t of Revenue, 784 N.W.2d

772, 775 (Iowa 2010) (“Although the legislature vested authority in the

department to interpret much of chapter 422, we are not convinced that

authority was intended to extend to all sections of the Code that

tangentially relate to chapter 422 [specifically Iowa Code section

476.1D(10) dealing with public utility regulation].”).     Nonetheless, we

concluded the department lacked clear interpretive authority related to the

specific issue involved in that case—whether a retailer could be considered

a “manufacturer” for purposes of an exemption from use tax contained in

Iowa Code section 422.45(27)(a)(1) (1999).      Sherwin-Williams Co., 789

N.W.2d at 424. Significant to our conclusion was the fact that the dispute

did “not center on an interpretation of the manufacturing exemption in

general or even on an interpretation of the statutory definition of

‘manufacturer.’ ” Id. at 423. Rather, the issue was “simply whether a

retail establishment can be considered a ‘manufacturer’ under” the

definition provided by the Iowa legislature. Id. The statutory definition

was an “insurmountable obstacle” to concluding the department had

interpretative authority over a term the legislature had defined itself. Id.

at 423–24.

      In contrast here, the Iowa legislature did not give its own definition

to “materially participated” in chapter 422.          Instead, “materially
                                    11

participated” is determined “as defined in section 469(h) of the Internal

Revenue Code.” Iowa Code § 422.7(21)(a)(1) (2005). The Iowa legislature

was not “act[ing] as its own lexicographer” by defining a statutory term.

Sherwin-Williams Co., 789 N.W.2d at 425 (“It is significant that the

legislature has chosen to define the word ‘manufacturer’ as used in the

manufacturing exemption. ‘We recognize the legislature “may act as its

own lexicographer.”    When it does so, we are normally bound by the

legislature’s own definitions.’ ” (quoting State v. Fischer, 785 N.W.2d 697,

702 (Iowa 2010))).    Rather, it referenced a definition contained in the

Internal Revenue Code.

      While the Internal Revenue Code is federal law over which the

Department has no direct enforcement powers, it is referenced throughout

and incorporated into many sections of Iowa Code chapter 422, see, e.g.,

Iowa Code § 422.7, over which the Department has both rule-making and

enforcement powers, see, e.g., id. §§ 422.68(1), .70; see also Sherwin-

Williams Co., 789 N.W.2d at 423–24 (“Moreover, the department director’s

enforcement power certainly requires the director to interpret the [Iowa]

Code provisions relevant to a taxpayer’s liability.” (citing Iowa Code

§ 422.70) (1999)).    Post-Renda, we have found disputes involving the

interplay between Iowa tax statutes and the Internal Revenue Code to be

clearly vested in the department. See Tremel v. Iowa Dep’t of Revenue, 785

N.W.2d 690, 692–93, 694 (Iowa 2010) (holding the department was clearly

vested with authority to interpret Iowa Code section 451.12 where the

dispute “involve[d] the interplay of the inheritance tax provisions in Iowa

Code chapter 450, the estate tax provisions of Iowa Code chapter 451, and

several provisions of the Federal Tax Code”).

      Looking to the Internal Revenue Code definition, section 469(h)

defines “material participation” for purposes of determining whether a
                                             12

taxpayer is subject to limitations placed on passive losses.                    See I.R.C.

§ 469(h) (2006). “In general― A taxpayer shall be treated as materially

participating in an activity only if the taxpayer is involved in the operations

of the activity on a basis which is– (A) regular, (B) continuous, and (C)

substantial.” Id. § 469(h)(1)(A)–(C). The definition goes on to address a

number of special considerations.                    Id. § 469(h)(2)–(5).         Treasury

regulations further illuminate the meaning of “material participation” as

used in § 469. See Temp. Treas. Reg. § 1.469-5T (as amended in 1996);

Treas. Reg. § 1.469-5 (1992).

       Our review of Internal Revenue Code § 469(h) and its accompanying

regulations convinces us that “material participation” is a specialized term

of art in tax law, which falls directly within the Department’s area of

expertise. See, e.g., Evercom Sys., Inc. v. Iowa Utils. Bd., 805 N.W.2d 758,

762–63 (Iowa 2011) (holding the Iowa Utility Board was vested with

authority to interpret “unauthorized change in telecommunication service”

because it was “a substantive term within the special expertise of the

agency” (first quoting Iowa Code § 476.103(3) (2005); and then quoting

Renda, 784 N.W.2d at 14)).             Further, “material participation” is not a

specialized term used in areas outside of tax law.4 Cf. Renda, 784 N.W.2d


       4The  only reference to “material participation” or “materially participated” we have
located in the text of a current Iowa statute is in section 422.7, at issue in this case. The
phrase appeared in prior versions of three other tax statutes, including Iowa Code
section 422.5(1)(o)(4)(b) (1987) (defining passive activities for purposes of alternative
minimum tax), Iowa Code section 422.35(11) (defining “net income” for corporations and
addressing passive activities), and Iowa Code section 425A.2(1)(b) (1991) (addressing
property taxes for farm property). The Iowa Code uses a similar term, “materially and
substantially participate,” in chapter 16, dealing with the beginning farmer tax credit and
loan program. Iowa Code § 16.75(3)(e) (2020) (“The beginning farmer shall materially and
substantially participate in farming.”); id. § 16.79(2)(d) (“A beginning farmer is a qualified
beginning farmer eligible to participate in the program [if they] . . . [w]ill materially and
substantially participate in farming.”). The term’s use in the United States Code is
likewise limited primarily to the tax context. See, e.g., I.R.C. § 42(h)(5)(B), (D) (2018)
(participation in low-income housing projects); id. § 56(b)(2)(C) (alternative minimum tax);
id. § 163(d)(5)(A)–(C) (investment property); id. § 263A(d)(2)(B) (deductibility of inventory
                                              13

at 14 (the terms “employee” and “dwelling” at issue were used in a number

of different substantive areas of law). Whereas we concluded the phrase

“suitable work” had a specialized legal meaning that extended beyond the

context of workers’ compensation to support our conclusion that the

workers’ compensation commission lacked authority to interpret that

phrase, see Neal v. Annett Holdings, Inc., 814 N.W.2d 512, 518–19 (Iowa

2012) (noting “suitable work” also arose in employment discrimination,

wrongful termination, unemployment compensation, and the odd-lot

doctrine), the specialized meaning of “material participation” does not

extend into other substantive areas of law.

       Another indication an agency has been granted interpretative

authority arises when an agency “must necessarily interpret [an

undefined] term in order to carry out its duties.” Renda, 784 N.W.2d at

12 (discussing City of Marion v. Iowa Department of Revenue & Finance,

643 N.W.2d 205, 207 (Iowa 2002)). City of Marion required us to determine

whether the department correctly interpreted the term “athletic sport” to

include swimming for purposes of an exception to the exemption for

costs); id. § 527(e)(5)(D) (participation in political organizations); id. § 761(f)(2)(B) (joint
ventures); id. § 864(c)(4)(B)(iii) (treatment of businesses operated by nonresidents and
foreign corporations); id. § 865(e)(2)(B) (sale of inventory property outside the United
States when a foreign entity participated in the sale); id. § 1402(a)(1) (earnings from self-
employment in the rental context); id. § 2032A(b)(1)(C)(ii) (sale of real property). Outside
of the Internal Revenue Code, we located only scattered references to the phrase in the
U.S. Code, mostly in related provisions, such as the Social Security Act addressing self-
employment income or nonprofit participation in providing housing for the elderly and
those with low income. See, e.g., 42 U.S.C. § 411(a)(1) (defining net earnings from self-
employment and addressing income from farm leases); id. § 1485(w)(1)(A) (setting funds
aside for tax-exempt nonprofits who develop projects to house low-income and elderly
persons). The only uses of the term we located outside the taxation context appear in the
definition of a “related person” for Bureau of Consumer Financial Protection purposes
and civil penalties for violations of the provisions of the Federal Food, Drug, and Cosmetic
Act. 12 U.S.C. § 5481(25)(C)(ii); 21 U.S.C. § 335b(e). Finally, like the Iowa Code, the U.S.
Code uses the term “materially and substantially participate” to define who qualifies as a
“beginning farmer or rancher” for tax and loan purposes. 7 U.S.C. § 1991(a)(11); I.R.C.
§ 147(c)(2)(B)–(C) (discussing “first-time farmers” and using the same “materially and
substantially” language).
                                          14

collection of sales tax contained in Iowa Code section 422.45(20). See 643

N.W.2d at 206 (“This exemption . . . does not apply to fees paid to cities

and counties for the privilege of participating in any athletic sports.”

(Emphasis omitted.) (quoting Iowa Code § 422.45(20) (1997))).                       The

department adopted Iowa Administrative Code rule 701—18.39 to define

“sport” and “athletic” sport, providing examples of athletic sports that

included swimming.           Id.     We concluded “that the matter under

consideration ha[d] been vested in the discretion of the agency,” id. at 207,

a conclusion we cited with approval in Renda, 784 N.W.2d at 12.

       Similarly, the Department “must necessarily interpret [material

participation] in order to carry out its duties” related to the capital-gain

deduction in section 422.7(21).           See Renda, 784 N.W.2d at 12.              The

Internal Revenue Code defines “material participation” in § 469(h) for

purposes of limiting the amount of passive losses a taxpayer can recognize

in a given year. The Iowa Code incorporates that definition into the distinct

context of deducting capital gains earned from the sale of real property

allowed by section 422.7(21)(a).          Applying the phrase in this distinct

context is not a straight-forward matter. The Department’s adoption of

rule 701—40.385 was necessary to assist it in meeting its obligation to

assess, collect, and challenge tax returns filed by taxpayers claiming the

capital-gain deduction. See Iowa Code § 422.70.

       Our review of the Renda guidelines “firmly convince[s us] that ‘the

legislature actually intended (or would have intended had it thought about

the question) to delegate to the agency interpretive power with the binding


       5In  November 1993, the department utilized the APA’s formal rule-making
procedure, see Iowa Code §§ 17A.4, .6 (1993), to adopt the detailed subrules in rule 701—
40.38, including paragraph (c) addressing the “material participation” requirement. 16
Iowa Admin. Bull. 1377, 1474–75 (Jan. 5, 1994); 16 Iowa Admin. Bull. 1045, 1093, 1127–
29 (Nov. 10, 1993).
                                     15

force of law over the elaboration’ of the terms” at issue in this case. Renda,

784 N.W.2d at 14 (quoting Bonfield at 63); cf. SZ Enters., LLC v. Iowa Utils.

Bd., 850 N.W.2d 441, 451 (Iowa 2014) (“Even where definitions have been

supplied by the legislature and the terms are not terms of art, we leave

open the possibility that the structure or subject matter of the legislation

is of sufficient complexity to require that this court defer to agency legal

interpretations.”). We are hard-pressed to find an issue more within the

Department’s expertise than application of “material participation” as

defined in Internal Revenue Code § 469(h) to the distinct context of the

Iowa capital-gain deduction. We will therefore uphold the Department’s

interpretation of what is meant by “material participation” as used in

section 422.7(21) unless it is “an irrational, illogical, or wholly

unjustifiable interpretation” of the statute. Iowa Code § 17A.19(10)(l).

      Even considering the deference given “to the agency’s interpretation,

the meaning of a statute is always a matter of law for us to determine.”

Iowa Ag Constr. Co. v. Iowa State Bd. of Tax Review, 723 N.W.2d 167, 173

(Iowa 2006).

      Factual determinations—including application of the law to specific

factual situations—have been clearly vested in the director. Lowe’s Home

Ctrs., LLC v. Iowa Dep’t of Revenue, 921 N.W.2d 38, 45–46 (Iowa 2018).

We therefore consider whether the director’s application of law to the facts

of this case was irrational, illogical, or wholly unjustifiable. See id. at 46

(“Because factual determinations are by law clearly vested in the agency,

it follows that application of the law to the facts is likewise vested by a

provision of law in the discretion of the agency.” (quoting Iowa Ag Constr.

Co., 723 N.W.2d at 174)); see also Iowa Code § 17A.19(10)(m); Nance, 908

N.W.2d at 267.
                                           16

       The Christensens carry the burden of demonstrating the invalidity

of the agency’s action. See Iowa Code § 17A.19(8)(a).

       III. Validity of Iowa Administrative Code Rule 701—40.38.

       We turn now to the issue underlying this appeal. The Christensens

claim the capital gain Lila received from the sale of farmland she inherited

from her father is excluded from income tax under Iowa Code section

422.7(21)(a). As discussed, section 422.7(21)(a) excludes from income

       [n]et capital gain from the sale of real property used in a
       business, in which the taxpayer materially participated for ten
       years, as defined in section 469(h) of the Internal Revenue
       Code, and which has been held for a minimum of ten years
       ....

Iowa Code § 422.7(21)(a)(1). The director did not dispute that Lila held the

property for ten years. Instead, she rejected the capital-gain deduction

only because the farmland was not used in a business in which the

Christensens6 “materially participated” as that phrase is further explained

in the Department rules.

       We begin our analysis by noting that “[t]ax exemption statutes are

construed strictly, with all doubts resolved in favor of taxation.” Sherwin-

Williams Co., 789 N.W.2d at 424 (alteration in original) (quoting Dial Corp.

v. Iowa Dep’t of Revenue, 634 N.W.2d 643, 646 (Iowa 2001)); see also

Lowe’s Home Ctrs., LLC, 921 N.W.2d at 46 (same, addressing exemption

from Iowa sales tax).        The Christensens, as the “taxpayer[s] seeking to

come under a tax exemption statute[,] ha[ve] the burden of proving an

entitlement to the exemption.” Lowe’s Home Ctrs., LLC, 921 N.W.2d at 46




       6The   Department does not dispute that although Lila, but not John, owned a half-
interest in the farmland, the Christensens are allowed to consider both spouses’ activities
in determining whether they satisfy the “material participation” requirement. See I.R.C.
§ 469(h)(5).
                                      17

(quoting Ballstadt v. Iowa Dep’t of Revenue, 368 N.W.2d 147, 148 (Iowa

1985)); see also Sherwin-Williams Co., 789 N.W.2d at 424 (same).

      We may reverse the agency’s interpretation only if it is “illogical,

irrational, or wholly unjustifiable.” Iowa Code § 17A.19(10)(l).

              A decision is “irrational” when it is “not governed by or
      according to reason.” Webster’s Third New International
      Dictionary 1195 [unabr. ed. 2002]. A decision is “illogical”
      when it is “contrary to or devoid of logic.” Id. at 1127. A
      decision is “unjustifiable” when it has no foundation in fact or
      reason. See id. at 2502 (defining “unjustifiable” as “lacking in
      . . . justice”); id. at 1228 (defining “justice” as “the quality or
      characteristic of being just, impartial or fair”); id. (defining
      “just” as “conforming to fact and reason”).

AFSCME Iowa Council 61 v. Iowa Pub. Emp’t Relations Bd., 846 N.W.2d

873, 878 (Iowa 2014) (quoting Sherwin-Williams Co., 789 N.W.2d at 432).

      Section 422.7(21)(a) excludes from an Iowa individual’s taxable

income the net capital gains earned from the sale of real property used in

a business if the taxpayer both held the land and “materially participated”

in the business in which the property was used for at least ten years. Iowa

Code § 422.7(21)(a) (incorporating definition of “material participation”

from I.R.C. § 469(h)).

      The definition of “material participation” contained in § 469(h) is not
complete without considering the context in which it is used. Section

469(h) expressly limits the definition of “material participation” to

“purposes of this section.” I.R.C. § 469(h) (2006). Thus, the remainder of

§ 469 must be considered to fully understand the context of the “material

participation” definition provided in § 469(h).     See Koons Buick Pontiac

GMC, Inc. v. Nigh, 543 U.S. 50, 60, 125 S. Ct. 460, 467 (2004) (“A provision

that may seem ambiguous in isolation is often clarified by the remainder

of the statutory scheme . . . .” (quoting United Sav. Ass’n of Tex. v. Timbers
                                      18

of Inwood Forest Assocs., Ltd., 484 U.S. 365, 371, 108 S. Ct. 626, 630

(1988))).

      Section 469 of the Internal Revenue Code limits the deductibility of

losses and credits from passive activities for federal income tax purposes.

It defines “passive activity” as any activity “which involves the conduct of

any trade or business” and “in which the taxpayer does not materially

participate.” I.R.C. § 469(c)(1) (emphasis added). Thus, § 469(h) defines

“material participation” as the antithesis of a passive activity for purposes

of the loss limitation rules.

      Section 469 expressly provides that with the exception of taxpayers

in a real property business as defined in paragraph (c)(7), “the term

‘passive activity’ includes any rental activity.” Id. § 469(c)(2). By definition

then, a rental activity is one in which the taxpayer does not materially

participate unless the taxpayer is in a real property business.

      With this context, we turn to the rules implemented by the

Department to provide guidance in determining when capital gains from

the sale of real property used in a business are excluded from Iowa

individual income tax. Rule 701—40.38 is titled “[c]apital gains deduction

or exclusion for certain types of net capital gains” and includes significant

detail within fourteen subrules. Iowa Admin. Code r. 701—40.38 (2006).

Subrule 40.38(7) addresses capital gains from the sale of real property

used in a business and defines “material participation” as “described in

detail in subrule 40.38(1), paragraph ‘c.’ ” Id. r. 701—40.38(7).

      Paragraph (c) in turn seeks to incorporate the terms of Internal

Revenue Code § 469 as well as its detailed implementing regulations. The

rule explains that “[g]enerally, an individual will be considered as

materially participating in a tax year if the taxpayer satisfies or meets any

of the following [seven enumerated] tests.”           Id. r. 701—40.38(1)(c)
                                               19

(implementing rules from Federal Treasury Regulations § 1.469-5 and

§ 1.469-5T). Following that list of seven general tests, the rule provides a

separate list of seven circumstances for “individuals in specific types of

activities that may have unique problems or circumstances related to

material participation in a business.”7

        Three of those seven specific types of activities relate to farming,

providing a rule for cash farm leases, farm landlords involved in crop-share

arrangements, and receipt of conservation reserve payments (CRP). As

relevant to this case, the cash-farm-lease paragraph provides as follows:

               4. Cash farm lease. A farmer who rents farmland on a
        cash basis will not generally be considered to be materially
        participating in the farming activity. The burden is on the
        landlord to show there was material participation in the cash-
        rent farm activity.

Id.   Another of the seven specific types of activities addresses “rental

activities or businesses.”

               7. Rental activities or businesses. For purposes of
        subrules 40.38(1) and 40.38(7), the general rule is that a
        taxpayer who actively participates in a rental activity or
        business which would be considered to have been material
        participation in another business or activity would be deemed
        to have had material participation in the rental activity unless
        covered by a specific exception in this subrule (for example,
        the exceptions for farm rental activities in numbered
        paragraphs “4,” “5,” and “6” immediately above). Rental
        activity or rental business is as the term is used in Section
        469(c) of the Internal Revenue Code.

        The Christensens argue they were not “farmers” to whom paragraph

(4) applies but rather they actively participated “in a rental activity or


        7The  “general” tests and the “specific activities” each include enumerated lists
under separate unnumbered paragraphs of rule 701—40.38(1)(c). Rule 701—40.38 has
since been renumbered so that the “general” tests are identified as section 40.38(1)(e)(1)–
(7) and the “special activities” tests, or “clarifications” as they are now called, are identified
(with two additional paragraphs) as section 40.38(1)(f)(1)–(9). For sake of clarity, we refer
to the distinct numbered lists used in the 2006 version of rule 701—40.38 as the “general
test” paragraphs and the “specific activities” paragraphs.
                                     20

business”—specifically a farm-rental business, fitting into paragraph (7).

They also challenge the rule’s treatment of income from farm lease

activities different than other rental activities or businesses, arguing

section 422.7(21) makes no such distinction.

      As the ALJ recognized, the Iowa legislature’s reference to Internal

Revenue Code § 469(h) to define “material participation” leaves a gap when

the term is applied to rental activities of any kind. The term “material

participation” as defined in § 469(h) has no application to rental activities

as a matter of law, except within the context of a real estate business as

defined in § 469(c). Given that gap, the Department promulgated rules to

address the “unique problem” of using this definition to determine whether

the capital-gain deduction is allowed when the taxpayer leases the real

property that generated the capital gain.

      The specific-activities paragraphs related to farmland scenarios

attempt to recognize when the landlord would be considered to have

materially participated in the business in which the property was used.

The different treatment of cash rent, crop-share, and CRP payments

recognizes that the usual cash-rent farm lease would require little

participation, let alone material participation. Nonetheless, the cash-rent

farm lease rule is not a hard-and-fast rule but leaves room for a landlord

receiving cash rent from the lease of farmland “to show there was material

participation in the cash-rent farm activity.” Iowa Admin. Code r. 701—

40.38(1)(c)(4).

      The separate rule described in paragraph (7) applies to “[r]ental

activity or rental business . . . as the term is used in Section 469(c) of the

Internal Revenue Code” unless one of the other specific activities

paragraphs applies, including the farming paragraphs.           Id. r. 701—
                                           21

40.38(1)(c)(7).8 Section 469(c) identifies a real property trade or business

as    “real     property       development,        redevelopment,         construction,

reconstruction, acquisition, conversion, rental, operation, management,

leasing, or brokerage trade or business.” I.R.C. § 469(c)(7)(C). Special

activities paragraph (7) essentially allows a taxpayer to use the general test

paragraphs of rule 701—40.38(1)(c) to establish material participation in

a rental activity related to a real property business, carving farming

activities out of the real property business definition.

       Given the gap in application of “material participation” as defined in

Internal Revenue Code § 469(h) when applied to rental activities, we think

the Department was well within its authority to develop the specific rules

addressed to capital gains from the sale of real property involved in a rental

business. We further accept the Department’s explanation that the

prevalence of farmland leases in Iowa and the differing types of related

arrangements support the rules specific to farmland.

       There is a difference in kind between leasing farmland and leasing

commercial or residential real property. Cf. 1 Marlin M. Volz, Jr., Iowa

Practice Series:TM Methods of Practice § 15:1, at 480 (2019) (recognizing

four general categories of leases, including leases of residential property,

commercial property, farm property, and equipment leases of personal

property); id. § 15:31, at 515 (addressing issues unique to leasing

farmland and identifying differences from leases of residential property).

The primary purpose of a farm lease is for use of the land, either to grow


       8The   Department directs us to the current version of rule 701—40.38 to support
its distinction between farm leases and commercial or residential leases. Rule 701—
40.38 was amended in 2014 to add a list of “[e]xamples of qualifying involvement in
operations of the property that are considered material participation activities if
performed on a regular, continuous and substantial basis.” 36 Iowa Admin. Bull. 1653,
1703–04 (Feb. 5, 2014). This list was not part of the rule in effect in 2006, and we do not
consider it.
                                       22

crops, harvest timber, or raise livestock, and the lessee is generally

responsible for caring for the land. To the extent there are structures on

the land, they are often secondary to the primary purpose of the farm lease.

On the other hand, the primary purpose of a commercial or residential

lease is to utilize a building, either to live in under a residential lease or to

house a business operation under a commercial lease. Here, the lessor

rather than the lessee generally retains responsibility for maintaining the

building. See, e.g., 49 Am. Jur. 2d Landlord and Tenant § 414, at 437

(2018) (“By its very nature, a lease of farmland imposes affirmative duties

on the tenant, compliance with which is termed good husbandry. This is

unlike an ordinary lease which normally would require only that the tenant

refrain from acts of affirmative waste.”); Gary Goldman, Uniform

Commercial Landlord and Tenant Act—A Proposal to Reform “Law Out of

Context,” 19 T.M. Cooley L. Rev. 175, 181 (2002) (explaining the historical

development of lease laws in the agricultural context created doctrines ill-

suited for “urban” leases of residential and commercial buildings, in large

part based on distinctions between farm leases “where the land was

primary and any structure was incidental” and leases of residential and

commercial buildings where “it is the structure that is primary and the

land that is irrelevant”).

      A farm lease focuses on the land and generally places responsibility

for the land on the lessee, whereas a commercial or residential lease

focuses on the building and generally leaves primary responsibility for the

building on the lessor. These basic differences underscore that different

types and levels of participation would be expected by the respective

landlord.   They also support the Department’s development of rules

specific to farm leases in determining whether a landlord meets the
                                     23

definition of “material participation” envisioned by Iowa Code section

422.7(21)(a).

      The evidence presented in this case reveals the limited involvement

of a typical cash-rent farm landlord. Rent payments were made only twice

per year, as is typical in a cash-rent farm lease. The only thing changed

on the standard farm lease form from year to year was the per-acre rate,

requiring at most a two-hour renegotiation, and even that did not always

change. The standard lease form placed on the tenant the obligations “to

keep said premises free from brush and burrs, thistles, and all noxious

weeds, and [to] mow and cut near the surface of all weeds.” Given the

focus of a farm lease on the land rather than any incidental buildings,

those terms leave little else for a cash-rent farm landlord to do.

      We also consider whether rule 701—40.38 furthers the purpose of

the statute it is intended to interpret.    See Sherwin-Williams Co., 789

N.W.2d at 423. Section 422.7(21)(a) excludes only certain capital gains

from taxable income, specifically those from the sale of real property used

in a business in which the taxpayer “materially participated” for at least

ten years. Iowa Code § 422.7(21)(a) It is relevant to our consideration of

the purpose of the capital-gain deduction that the same subsection allows

a deduction for capital gains earned on the sale of a business, narrowly

defined in the statute to “mean[] the sale of all or substantially all of the

tangible personal property or service of the business.” Id. § 422.7(21)(a)(1).

In Ranniger, we affirmed denial of the capital-gain deduction to an

accountant because selling his fifty percent interest in an accounting

partnership did not satisfy the statute’s limited application to capital gains

earned from the “sale of a business.” See Ranniger, 746 N.W.2d at 269.

We rejected the accountant’s argument that his fifty percent interest was

itself “a business.”    Id.   The department’s determination—that the
                                      24

accounting partnership, not the accountant’s ownership interest in it, was

the relevant business to which the deduction could apply—was not

irrational, illogical, or wholly unjustifiable.   See id. (“The department’s

more narrow view of the statute is consistent with [our strict construction

against exemptions]; the taxpayers’ expansive view is not.”). While the

purpose of the capital-gain deduction is not stated by the legislature, the

lengthy ten-year holding period, the narrow definition of “sale of a

business” in the same subsection, and the material-participation

requirement indicate the legislature intended the deduction to apply

narrowly.   See Lowe’s Home Ctrs., LLC, 921 N.W.2d at 46 (noting we

construe exemptions strictly in favor of taxation).

      We reject the Christensens’ argument that the rule is invalid

because it makes distinctions not made in the statute. Although section

422.7(21) does not distinguish between farm-rental activities and other

types of rental activities, neither does it preclude the distinction. Where

rule 701—40.38 is not inconsistent with the statutory language, and it

addresses a specific gap resulting from incorporation of a definition from

the Internal Revenue Code into a different application under the Iowa

Code, we cannot say the rule is irrational, illogical, or wholly unjustifiable.

Cf. Auen v. Alcoholic Beverages Div., 679 N.W.2d 586, 591–92 (Iowa 2004)

(holding rule was irrational or illogical where, “[i]n essence, the ABD

ignored the phrase ‘indirectly be interested in ownership’ as used by the

legislature in section 123.45” when it promulgated a rule allowing a remote

or de minimis ownership interest (quoting Iowa Code § 123.45 (2001))).

The longevity of the rule, unchallenged by the legislature for over a decade

at the time the Christensens claimed the deduction in 2006, also supports

our conclusion that the rule’s treatment of farm leases is not irrational,

illogical, or wholly unjustifiable. See Serv. Emps. Int’l Union, Local 199 v.
                                     25

Iowa Bd. of Regents, 928 N.W.2d 69, 78 (Iowa 2019) (“The rule has

withstood the test of time. The legislature in the subsequent four decades

has taken no action to invalidate this rule.”); Lowe’s Home Ctrs., LLC, 921

N.W.2d at 48 (“The legislature has not amended section 423.3(37) in

response to this administrative rule [promulgated in 2005]. ‘We consider

the legislature’s inaction as a tacit approval of the [agency’s] action.’ ”

(second alteration in original) (quoting City of Sioux City v. Iowa Dep’t of

Revenue & Fin., 666 N.W.2d 587, 592 (Iowa 2003) (noting the eleven-year

history of an administrative rule weighed against finding it invalid))).

      The Department acted within its discretion when it promulgated

distinct rules for farm leases and other types of real property leases in rule

701—40.38(1)(c).

      IV. Application of Rule 701—40.38 to this Case.

      Having determined the rule’s distinction between leases of farmland

and other types of real property is valid, we reject the Christensens’

attempt to avoid the farm-specific rules. As discussed above, there was a

logical reason to treat leases of farmland differently based on the minimal

activities generally involved with such leases. The rules use “farmer” and

“farm landlord” interchangeably. There is no doubt that the Christensens

entered into “cash farm leases,” and their attempt to recharacterize their

“business” as a rental business does not take it out of the specific rule

adopted for cash farm leases.

      While a cash-rent farm landlord “will not generally be considered to

be materially participating in the farming activity,” the taxpayer is

nonetheless entitled to the deduction if he or she can “show there was

material participation in the cash-rent farm activity.” Iowa Admin. Code

r. 701—40.38(1)(c)(4).    Even considering the nonfarm standards for

material participation, we conclude the Department’s rejection of the
                                      26

capital-gain deduction in this case was well justified by the facts as

presented to the Department.

      Under the general test paragraphs of rule 701—40.38(1)(c) “an

individual will be considered as materially participating in a tax year if:

. . . [t]he individual participates in the business for more than 100 hours

in the tax year and no other individual spends more time in the business

activity than the taxpayer.”      Iowa Admin. Code r. 701—40.38(1)(c)(3).

Another general test paragraph provides that

      [a]n individual who participates in the business activity for
      more than 100 hours may be treated as materially
      participating in the activity if, based on all the facts and
      circumstances, the individual participates on a regular,
      continuous, and substantial basis.

See id. r. 701—40.38(1)(c)(7).

      Although the Christensens alleged they met these tests, the director

properly determined their bare allegations, without any real quantification

of the work they completed, were insufficient to satisfy any of the rule

701—40.38 material-participation tests.        Their limited activities of

collecting rent twice a year and renegotiating the leases, a two-hour

endeavor, were not “regular, continuous, and substantial.” The director

rejected John’s testimony about work activities as vague and contradicted

by other, more direct evidence.

      It is the agency’s duty “as the trier of fact to determine the
      credibility of the witnesses, weigh the evidence, and decide the
      facts in issue.” “We are bound by the agency’s findings so long
      as they are supported by substantial evidence.”

Christiansen v. Iowa Bd. of Educ. Exam’rs, 831 N.W.2d 179, 192 (Iowa

2013) (first quoting Arndt v. City of Le Claire, 728 N.W.2d 389, 394–95

(Iowa 2007); and then quoting Am. Eyecare v. Dep’t of Human Servs., 770

N.W.2d 832, 835 (Iowa 2009)). The director’s findings were bolstered by
                                      27

the lack of any attempt by the Christensens to quantify the time spent

performing any of the claimed tasks.          The director’s findings were

supported by substantial evidence, and she was well within her discretion

to deny the capital-gain deduction based on the record presented.

      V. Disposition.

      The director’s assessment of additional taxes and related penalties

and interest was not irrational, illogical, or wholly unjustifiable. Therefore,

we affirm the judgment of the district court.

      AFFIRMED.