GAO 

United States Government Accountability Office

Report to Congressional Requesters

TAX 

ADMINISTRATION 

Opportunities Exist 

for IRS to Enhance 

Taxpayer Service and 

Enforcement for the 

2010 Filing Season 

September 2009 

GAO-09-1026 
Page i GAO-09-1026 

Contents 

Letter 1

Results 4 

Conclusions 5 

Matters for Congressional Consideration 6 

Recommendations for Executive Action 6 

Agency Comments 7 

Appendix I Updated Slides from the September 1, 2009, Briefing 8 

Appendix II Most Common Error Reject Codes in the 2009 

Filing Season and IRS Descriptions 24 

Appendix III GAO Contact and Staff Acknowledgments 28 

Table 

Table 1: Most Common Error Reject Codes and IRS Descriptions 

for the 2009 Filing Season 24 

 Tax Administration 
Abbreviations 

AGI adjusted gross income 

DOB date of birth 

EIC Earned Income Tax Credit 

EIN employer identification number 

ERC error reject code 

ETAAC Electronic Tax Administration Advisory Committee 

IRS Internal Revenue Service 

PIN personal identification number 

SEQ sequence number 

SSA Social Security Administration 

SSN Social Security number 

TIGTA Treasury Inspector General for Tax Administration 

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Page ii GAO-09-1026 Tax Administration
Page 1 GAO-09-1026 

 

United States Government Accountability Office

Washington, DC 20548 

 

September 23, 2009 

The Honorable Max Baucus 

Chairman 

The Honorable Charles E. Grassley 

Ranking Member 

Committee on Finance 

United States Senate 

The Honorable John R. Lewis 

Chairman 

The Honorable Charles W. Boustany Jr. 

Ranking Member 

Subcommittee on Oversight 

Committee on Ways and Means 

House of Representatives 

Preparing for the tax filing season is a significant undertaking for Internal 

Revenue Service (IRS). The filing season is when most individuals file 

their tax returns, receive refunds, and contact IRS if they have questions.1

As returns are received, IRS begins a series of automated compliance 

checks to correct errors on tax returns and ensure that refunds are 

justified. For example, IRS rejects electronically filed returns with basic 

errors requiring taxpayers to correct and resubmit them. It uses what is 

called “math error authority” to automatically correct obvious 

noncompliance such as violations of limits on deductions or credits, which 

allows IRS to avoid costly audits.2

 As we reported earlier to you, from 

1

Most taxpayers filed their 2008 tax returns from January 1 to April 15, 2009, which is the 

deadline for filing individual income tax returns. For the 2009 filing season, IRS began 

accepting electronic returns on January 16. However, millions of taxpayers receive 

extensions from IRS, which allowed them to delay filing until as late as October 15. 

2

Over the years, Congress granted IRS legal authority to cover 11 areas through its math 

error authority so the agency could correct return errors during processing, including 

calculation errors and entries that are inconsistent or exceed statutory limits. If it is not 

specified in the statute, IRS cannot pursue assessment and collection activities without 

issuing a statutory notice of deficiency. IRS was granted math error authority in 26 U.S.C. § 

6213(b) and it can only be used as specified in 26 U.S.C. § 6213(g)(2). An example of a math 

error correction would be where IRS can automatically correct a return by disallowing a 

child tax credit if the filer fails to provide the correct taxpayer identification number. 

Prompt compliance checks are important because as unpaid taxes age, the likelihood of 

collecting all or part of the amount owed decreases. 

 Tax Administration 
 

January 1 through May 15, 2009, IRS had processed over 120 million 

returns, issued over 100 million refunds, received 66 million telephone 

calls, and answered 20 million calls using nearly 12,000 assistors.3

 

IRS must begin preparing for each filing season months in advance and 

preparations include the following. 

• Revising tax forms and publications to implement tax law changes. Recent 

major law changes that affected the 2009 filing season include the 

• Economic Stimulus Act of 2008, which contained the recovery rebate 

credit allowing taxpayers who did not receive the full economic 

stimulus payment last year to claim some or all of the unpaid credit on 

their 2008 returns;4

• Housing and Economic Recovery Act of 2008 (Housing Act), which 

included a first-time homebuyer credit of up to $7,500;5

 and 

• American Recovery and Reinvestment Act of 2009 (Recovery Act), 

which increased the maximum credit to $8,000 and eliminated the 

payback provision of the first-time homebuyer credit for homes 

purchased before December 1, 2009.6

• Reprogramming and testing computer systems to incorporate tax law 

changes. 

• Hiring and training telephone assistors, many of whom are temporary 

hires employed for the filing season. 

• Coordinating with the paid preparer and tax software industries, which 

serve as important intermediaries between IRS and taxpayers and prepare 

 

3

GAO, Tax Administration: Interim Results of IRS’s 2009 Filing Season, GAO-09-640 

(Washington, D.C.: June 3, 2009). IRS answered 23 million calls through its automated 

service and nearly 23 million taxpayers abandoned their calls, received busy signals, or 

were disconnected by IRS. 

4

Economic Stimulus Act of 2008, Pub. L. No 110-185, 122 Stat. 613 (2008). 

5

Housing and Economic Recovery Act of 2008, Pub. L. No. 110-289, 122 Stat. 2654 (2008). 

6

American Recovery and Reinvestment Act of 2009, Pub. L. No. 111-5, 123 Stat. 115 (2009). 

While many of the provisions of the two credits are the same, a major difference is that the 

2008 first-time homebuyer credit has to be paid back over a 15-year period, while the 2009 

credit does not. 

Page 2 GAO-09-1026 Tax Administration
 

close to 90 percent of all returns and all electronically filed returns.7 IRS 

also coordinates with a network of volunteer tax return preparers who 

help elderly individuals and others prepare their tax returns at over 12,000 

volunteer sites. 

Because of the magnitude and importance of the filing season, you 

requested that we review IRS’s 2009 filing season performance. As part of 

that review, we looked for opportunities to improve service and enhance 

enforcement in time for the 2010 filing season, which this report 

addresses. On September 1, 2009, we briefed Subcommittee on Oversight, 

House Committee on Ways and Means, and Senate Committee on Finance 

staff on opportunities for IRS to enhance taxpayer service and 

enforcement for the 2010 filing season. This report transmits the updated 

briefing materials, which are reprinted in appendix I. Our report on IRS’s 

2009 filing season performance will be issued in November. 

To identify opportunities to make improvements for 2010, we obtained and 

analyzed IRS’s performance and production data and compared them to 

annual goals and prior years’ performance; viewed IRS operations; 

reviewed relevant external documentation including our reports and 

reports of the Treasury Inspector General for Tax Administration; and 

interviewed IRS officials and representatives of paid preparers and tax 

software developers. We conducted our work primarily at IRS 

Headquarters in Washington, D.C., and division and field offices, including 

those in Atlanta, Georgia. We previously assessed IRS’s filing season 

performance data for reliability. For example, we considered filing season 

performance measures and data that cover the quality, accessibility, and 

timeliness of IRS’s services to be objective and reliable based on that 

work. Since the data sources and procedures for producing this year’s 

filing season data have not significantly changed from prior years, we 

determined that the data were sufficiently reliable for the purposes of this 

report. To the extent possible, we corroborated information from 

interviews with documentation and data, and where this was not possible, 

we report the information as attributed to IRS officials. We conducted this 

 

7

As we have reported, the number of returns they prepare and the advice and support paid 

preparers and software companies provide to taxpayers make these intermediaries a 

critical component in the tax system. See, for example, GAO, Tax Administration: Many 

Taxpayers Rely on Tax Software and IRS Needs to Assess Associated Risks, GAO-09-297 

(Washington, D.C.: Feb. 25, 2009), and Tax Preparers: Oregon’s Regulatory Regime May 

Lead to Improved Federal Tax Return Accuracy and Provides a Possible Model for 

National Regulation, GAO-08-781 (Washington, D.C.: Aug. 15, 2008). 

Page 3 GAO-09-1026 Tax Administration
 

performance audit from January 2009 through September 2009 in 

accordance with generally accepted government auditing standards. Those 

standards require that we plan and perform the audit to obtain sufficient, 

appropriate evidence to provide a reasonable basis for our findings and 

conclusions based on our audit objectives. We believe that the evidence 

obtained provides a reasonable basis for our findings and conclusions 

based on our objectives. 

IRS may be missing opportunities to improve taxpayer service and 

enhance compliance for the 2010 filing season for the following reasons. Results 

• IRS lacks a strategy for preventing and resolving errors that cause 

electronically filed returns to be rejected. Without a strategy that 

documents, for example, its objectives, the role of external stakeholders, 

and schedules for specific actions, IRS may be missing an opportunity to 

make electronic filing less cumbersome for taxpayers. 

• IRS does not fully leverage the expertise of external stakeholders in its 

efforts to reduce rejected electronic returns, according to industry 

representatives, the Treasury Inspector General for Tax Administration, 

and an IRS advisory group. IRS has established an internal working group 

to reduce rejects and simplify error codes, but that group does not include 

industry representatives. Without soliciting the expertise of these 

stakeholders, IRS may be missing an opportunity to better understand why 

rejects occur and what can be done to prevent them. 

• IRS acknowledges that its codes for errors on electronically filed tax 

returns are not very useful for helping taxpayers resolve the errors and has 

established the reject working group, but IRS does not have an action plan 

for implementing improvements. Without such an action plan, the working 

group risks being less effective in developing more useful reject codes. 

• The electronic acknowledgments that IRS sends to paid preparers, 

software providers, and taxpayers about rejected electronic returns are 

confusing and unclear. Unclear notices frustrate taxpayers and increase 

IRS’s costs because such notices generate phone calls from taxpayers (see 

app. II for more information on the common error reject codes in 2009 and 

IRS’s electronic acknowledgments). 

• According to IRS, its assistors answered 3 million calls from taxpayers 

needing authentication to file electronically, nearly 10 percent of all 

assistor calls, at a cost of $36 million through June 2009. Instead of relying 

on assistors to provide taxpayers with this information, IRS recently began 

Page 4 GAO-09-1026 Tax Administration
 

developing an automated application for authenticating electronic filers, 

which could increase efficiency by diverting some calls currently 

answered by IRS telephone assistors. The new application is scheduled to 

launch on January 18, 2010. As of August 26, 2009, IRS officials reported 

that they were on schedule. If IRS were to experience any slippage in the 

launch date, it would be missing an opportunity to reduce call volume at 

the beginning of the filing season. 

• IRS lacks an automated means for helping taxpayers locate its 12,000 

volunteer tax preparation sites or their hours of operation. In the 2009 

filing season, taxpayers contacting IRS for this information had to call IRS 

and speak to an IRS assistor. Assistors have a list of volunteer site 

locations and hours that is updated twice a week. However, that 

information is not on IRS’s Web site. Low-cost options, such as posting 

IRS’s existing list of volunteer sites on its Web site, could eliminate some 

calls currently being answered by IRS assistors. 

• IRS lacks math error authority, which must be provided by statute for 

specific purposes, to verify compliance with two aspects of the first-time 

homebuyer tax credit. First, IRS would have to use labor-intensive audits 

to ensure compliance with the repayment provision of the 2008 credit—

according to IRS, 1.2 million taxpayers claimed the 2008 credit for a total 

of $8.6 billion that must be repaid. Similarly, IRS has to use audits to 

ensure taxpayers do not claim the credit for both 2008 and 2009. Because 

math error checks are automated and could substitute for burdensome 

audits, IRS could check all returns at relatively low cost with such 

authority. 

As part of its preparations for the 2010 filing season, IRS has the 

opportunity to improve service to millions of taxpayers and reduce its own 

costs by reducing electronic filing rejects and providing more automated 

services. If IRS were to take advantage of these opportunities, it may be 

able to reduce the volume of taxpayer phone calls, which would improve 

taxpayer access to IRS assistors. 

Conclusions 

To realize maximum benefit for the 2010 filing season from its new 

automated applications for authenticating electronic filers, IRS will need 

to adhere to its schedule of implementation by January 18, 2010. The 

beginning of the filing season is when many taxpayers file returns 

electronically in order to receive their refund. Any slippage in the schedule 

means that taxpayers wishing to file electronically will have little option 

but to contact an IRS assistor. Missing this early window in 2010 could 

Page 5 GAO-09-1026 Tax Administration
 

also delay potential benefits to both taxpayers and IRS of an improved 

authentication system for early filers until the 2011 filing season. 

We also identified two opportunities for Congress to provide IRS with 

additional authority to improve compliance for the 2010 filing season and 

beyond and reduce its costs by extending math error authority to cover 

two aspects of the first-time homebuyer tax credit. Compared to audits, 

automated math error checks provide a low-cost option that may be 

particularly useful as IRS confronts the challenges of ensuring compliance 

with new tax law provisions. 

In order to provide a low-cost option that helps ensure compliance with 

recent legislation, we suggest that Congress consider providing IRS with 

math error authority to (1) use the prior year’s tax return information to 

automatically verify taxpayers’ compliance with the 2008 first-time 

homebuyer credit payback provision, and (2) ensure that taxpayers do not 

improperly claim the credit in multiple years. 

We recommend that the Commissioner of Internal Revenue take the 

following five actions. 

• Develop and document a strategy to prevent and resolve errors causing 

electronically filed returns to be rejected. 

Matters for 

Congressional 

Consideration 

Recommendations for 

Executive Action 

• Involve stakeholders from the paid preparer and tax software industries in 

IRS’s current reject working group. 

• Develop an action plan for its reject working group that includes such 

elements as the scope of responsibility, a plan for testing changes, and a 

schedule for implementing changes. 

• Provide paid preparers and software providers with clearer descriptions of 

why returns are rejected. 

• Implement a low-cost automated method for providing volunteer site 

locations and hours of operation to taxpayers. 

Page 6 GAO-09-1026 Tax Administration
 

In commenting on a draft of this report, the IRS Commissioner for Wage 

and Investment stated that based on the allotted response time that IRS 

neither agrees nor disagrees with the recommendations contained in this 

report. 

As agreed with your offices, unless you publicly announce the contents of 

this report earlier, we plan no further distribution until 30 days from the 

report date. At that time, we will send copies to the Chairmen and Ranking 

Members of other Senate and House committees and subcommittees that 

have appropriation, authorization, and oversight responsibilities for IRS. 

We will also send copies to the Commissioner of Internal Revenue, the 

Secretary of the Treasury, the Chairman of the IRS Oversight Board, and 

the Director of the Office of Management and Budget. The report also will 

be available at no charge on the GAO Web site at http://www.gao.gov. 

If you or your staff have any questions or wish to discuss the material in 

this report further, please contact me at (202) 512-9110 or at 

whitej@gao.gov. Contact points for our Offices of Congressional Relations 

and Public Affairs may be found on the last page of this report. GAO staff 

James R. White 

who made contributions are listed in appendix IV. 

Director, Tax Issues 

Agency Comments 

Strategic Issues 

Page 7 GAO-09-1026 Tax Administration
Appendix I: Up

Septem

dated Slides from the 

ber 1, 2009, Briefing

Page 8 GAO-09-1026 

Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

1

Tax Administration: Opportunities Exist for 

IRS to Enhance Taxpayer Service and 

Enforcement for the 2010 Filing Season

Prepared for the

Committee on Finance

U.S. Senate

and the

Subcommittee on Oversight, Committee on Ways and Means, 

House of Representatives

Sept. 1, 2009 (Updated) 

 Tax Administration 
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

2

Background

• The Internal Revenue Service’s (IRS) preparation for the filing season, which begins months in advance, includes: updating forms, guidance, and processes to reflect tax law changes; hiring and training staff including part time staff who answer 

telephones; and programming and testing IRS’s computer systems. 

• IRS has been challenged in recent filing seasons with having to implement major tax law changes, such as the stimulus-related 2008 Housing Act and 2009 Recovery Act 

provisions, which provided and extended the new first-time homebuyer credit. 

• As of June 30, 2009, IRS received 78 million phone calls, 26 million of which were answered by assistors. Quick access to IRS telephone assistors contributes to accurate returns by reducing taxpayers’ confusion about their tax obligations.

• Taxpayers used paid preparers or tax preparation software to prepare 85 percent of all individual income tax returns in 2008. In addition to preparing tax returns, these stakeholders provide advice and other assistance to taxpayers, thus sharing the costs of administering the tax code with IRS. Taxpayers who file electronically must 

do so through such intermediaries. 

• As of August 14, 2009, taxpayers filed over 90 million tax returns electronically (68 percent of all returns), which continues to expedite refunds and save IRS resources.

Page 9 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

Page 10 GAO-09-1026 

3

Background

• IRS begins checking taxpayer compliance as it receives tax returns. 

• IRS’s electronic filing system has automated validity checks to help ensure the accuracy of returns and correct mistakes in a timely manner, benefiting taxpayers and reducing IRS’s costs. These automated checks look for errors, such as incorrect Social Security numbers (SSNs) for dependents, incorrect birth dates, and invalid zip codes, at the time the return is submitted electronically. 

• IRS automatically rejects electronic returns with these errors, associates them with one of about 600 possible reject codes and sends taxpayers, through their intermediaries, electronic acknowledgements giving the error code. Taxpayers are responsible for correcting the errors and resubmitting the returns.

• For paper returns, these validity checks are done after returns are accepted. 

• After returns are accepted, IRS’s math error program identifies calculation errors and 

checks for obvious noncompliance such as claims above income and credit limits. 

IRS corrects these errors during processing, which avoids the need for audits. 

 Tax Administration 
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

4

Objectives, Scope, and Methodology

• Our objective was to identify opportunities for IRS to provide better service and enhance enforcement in time for the 2010 filing season. 

• We analyzed IRS performance and production data, observed IRS operations, attended IRS production meetings, reviewed Treasury Inspector General for Tax Administration (TIGTA) and Electronic Tax Administration Advisory Committee (ETAAC) reports, and interviewed IRS officials and external stakeholders about 

performance issues and anomalies. 

• We previously assessed IRS’s filing season performance data for reliability. We considered performance measures and data that cover the quality, accessibility, and timeliness of IRS’s service to be objective and reliable based on that work. 

• We conducted our work at IRS headquarters in Washington, D.C. and division and field offices, including those in Atlanta, from January through August 2009 in accordance with generally accepted government auditing standards. 

• We prepared this briefing because, in the course of our ongoing filing season work, we identified several opportunities where immediate action could be taken in time to 

improve the 2010 filing season.

Page 11 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

5

Results in Brief

IRS may be missing opportunities to improve service to taxpayers and enhance enforcement for the 2010 filing season because it

• lacks a strategy for preventing and resolving errors that cause electronically filed returns to 

be rejected;

• does not fully leverage the expertise of paid preparers and the tax software industry in its 

efforts to prevent and resolve rejected electronically filed returns;

• does not have an action plan for implementing improvements to the error reject codes; 

• sends electronic acknowledgments to preparers and software providers about rejected 

returns that are confusing and unclear;

• is developing an automated application for authenticating electronic filers, but is not 

scheduled to launch it until after the date electronic filing begins; 

• lacks an automated means for helping taxpayers locate volunteer sites; and 

• lacks math error authority to check compliance with two aspects of the first-time 

homebuyer tax credit. 

Page 12 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

6

IRS Lacks a Strategy for Preventing and Resolving 

Errors That Cause Electronically Filed Returns to Be 

Rejected

• According to IRS’s September 2008 Advancing E-file study, electronic validation aids 

taxpayers by helping ensure that returns are accurate, but it can sometimes be 

cumbersome for taxpayers to understand and correct errors. Paid preparers and tax 

software industry representatives that we spoke with during the 2009 filing season 

said this remains an issue. 

• While IRS has some efforts under way to make dealing with rejects less 

cumbersome, IRS lacks a coordinated strategy for preventing and resolving rejects. 

It lacks a documented strategy that describes, for example, overall objectives, the 

role of external stakeholders, schedules for specific actions, and needed resources. 

According to ETAAC, IRS has made progress on an ad hoc basis, but addressing 

the reject issue must be a permanent, structured process.1

• Without a strategy, IRS may be missing an opportunity to increase electronic filing, 

reduce paper filing, and reduce taxpayer burden. 

1 Electronic Tax Administration Advisory Committee, Annual Report to Congress (Lanham, Md., June 2009). 

Page 13 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

7

IRS Could Further Leverage the Expertise of External 

Stakeholders in Its Efforts to Prevent and Resolve 

Rejects

• Tax industry representatives we spoke with said that IRS is missing opportunities to leverage industry expertise in order to prevent and resolve rejects. TIGTA and 

ETAAC have made the same point.2

• Recent experience with the recovery rebate credit shows the value of working with stakeholders. Early in the 2009 filing season, IRS realized that millions of 

taxpayers were making errors claiming the credit. IRS consulted with industry representatives to develop a successful approach for preventing more of these 

errors. 

• Stakeholder involvement can be particularly important for agencies that operate in a complex environment, such as tax policy, and where issues can best be addressed by soliciting the views of stakeholders with specialized expertise.3

• Without soliciting the expertise of these stakeholders, who assist 85 percent of taxpayers in filing their returns, IRS may be missing an opportunity to better understand why rejects occur, work with stakeholders to prevent rejects, and help taxpayers correct errors in a less cumbersome way.

2 Treasury Inspector General for Tax Administration, A Self-assistance Option Would Reduce Burden and Costs Associated with Resolving Rejected Electronic Tax Returns, Reference No. 2007-40-128 (Washington, D.C.: June 17, 2008). 3 GAO, Agencies’ Strategic Plans Under GPRA: Key Questions to Facilitate Congressional Review, GAO/GGD-10.1.16 (Washington, D.C.: May 1997). 

Page 14 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

8

IRS Has a Working Group to Simplify Error Reject 

Codes, but Does Not Have an Action Plan for 

Implementing Changes 

• IRS has over 600 error reject codes, but they are not very useful. Of the 600 codes, 

13 account for 81 percent of all rejected electronically filed returns. Paid preparer and software industry representatives said that some codes are very general and cover multiple issues, while others are so narrow that they are rarely used. IRS and TIGTA similarly reported that the rejection codes are often not useful in determining why the return was rejected.4

• IRS acknowledges that error reject codes are a problem and has established a 

working group to simplify the codes. However, IRS’s internal working group does not include industry representatives nor at the time we completed our work did IRS have 

an action plan that included elements such as the scope of responsibility of the working group, a plan for testing changes, and a schedule for implementing changes. 

• Without such an action plan, the working group risks being less effective and timely at developing more useful reject codes. 

4 See Internal Revenue Service, Advancing E-file Study, Phase 1 Report, Document Number 0206.0210, Sept. 30, 2008).

Page 15 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

9

Electronic Acknowledgments That IRS Sends 

Preparers and Software Providers About Rejects are 

Confusing and Unclear 

• According to paid preparers and software providers, the error codes included in IRS’s electronic acknowledgments too often do not clearly indicate the line on a return where an error was made 

or the precise nature of the error. They said that they are unable to provide an explanation of some error codes to taxpayers and that taxpayers must call IRS for help.

Table 2: Common Error Reject Codes and Descriptions Sent to Paid Preparers and Software Providers

Source: IRS.

• IRS recently placed clearer descriptions and possible solutions for 13 common electronic reject codes on its Web site. However, IRS did not change the electronic acknowledgments. IRS 

officials said that IRS’s Modernized E-file program is supposed to provide clearer acknowledgments, but also said that the program will not be fully implemented until 2012. 

• Unclear acknowledgments create frustration for taxpayers and expense for IRS because confused taxpayers call IRS.

Employer Identification Number (SEQ 0040) of Form W-2 and/or W-2GU, Payer Identification Number (SEQ 0026) of Form W2G,and Payer Identification Number (SEQ 0050) of Form 1099-R and Company or Trust Identification Number (SEQ 0120) of Form 

2439, and Employer EIN (SEQ 0200) of 499R-2/W-2PR Record must match data from the IRS Master File. 

0502

Tax Form – Primary SSN (SEQ 0010) and Primary Name Control (SEQ 0050) of the Tax Form must match data from the IRS Master 

File. 0500

0029 Tax return record identification page 1 – EFIN of originator (SEQ 0008B) must be for a valid electronic filer. 

Description Error reject code 

number 

Page 16 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

10

Answering AGI Calls Cost IRS Millions of Dollars 

Because It Lacked an Automated Method for 

Providing That Information

• During the 2009 filing season, taxpayers had to provide their last year’s adjusted gross income (AGI) or personal identification number (PIN) to authenticate their identity in order to electronically file. 

• Taxpayers who did not know their AGI or PIN and tried to get them from IRS 

had to call an assistor or visit an IRS walk-in site. 

• As of June 30, 2009, IRS had answered 3 million calls from taxpayers requesting 

their AGI, over 10 percent of the calls answered by assistors. 

• Counting calls not answered, IRS received over 5 million AGI-related calls, 

contributing to increased wait times. Taxpayers waited an average of 8 minutes to be connected to an IRS assistor and millions of taxpayers abandoned their calls or were disconnected by IRS while waiting. 

• According to IRS, AGI authentication-related calls cost nearly $36 million through June 30, 2009. 

Page 17 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

11

IRS is Developing an Automated Application to 

Authenticate Electronic Filers, but the Launch Date Is 

in 2010

• Although initially reluctant, in August 2009, IRS officials informed us that they took action and were developing Web and automated telephone applications for the 2010 

filing season for taxpayers who do not have their prior year’s AGI or PIN. The officials said that the new application will provide taxpayers with an alternative 

number that will allow them to file electronically. 

• IRS officials showed us plans that included costs, milestones and a launch date of January 18, 2010, 3 days after the date electronic filing begins. As of August 26, 

2009, the officials reported that they were on schedule. 

• Meeting the launch date is important for IRS to realize the full benefits of its efforts, since taxpayers expecting a refund tend to file early and file electronically. Therefore, any delay could leave taxpayers with little option but to call IRS and speak with an assistor. 

• Successful implementation in time for the 2010 filing season has the potential to significantly reduce the burden on IRS’s telephone assistors and improve taxpayer service. However, IRS has just begun developing these applications, testing is 

scheduled to continue up to the launch date, which is just after electronic filing 

begins, and there is no time for schedule slippage. 

Page 18 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

12

Taxpayers Seeking Information from IRS on the 

Location and Hours of Volunteer Sites Must Speak to 

an IRS Assistor 

• Taxpayers contacting IRS for the location and hours of the 12,000 volunteer sites must speak to an IRS assistor. 

• Assistors have a list of volunteer site locations and hours that is updated twice a week. However, that information is not on IRS’s Web site, which directs taxpayers to call IRS. 

• Although IRS reported receiving a relatively small number of such calls—

60,000 as of June 30—the calls do add to IRS’s telephone queues. Even at half of the average assistor cost per call of $25.75 this is nearly $800,000 a year to answer such calls. 

• IRS does post location information for its Super Saturdays, 1-day events that provide tax assistance at hundreds of sites across the country, on its Web site, IRS.gov. 

• Although IRS has plans to provide a zip code locator as part of a future redesign of its Web site, that redesign has yet to be funded. In the meantime, low-cost options, such as posting IRS’s existing list of volunteer sites and hours on IRS.gov, could eliminate some calls to assistors. 

Page 19 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

13

IRS Lacks Math Error Authority for Ensuring 

Compliance with Two Aspects of the First-Time 

Homebuyer Tax Credit 

• Currently, IRS has to use labor-intensive, expensive audits to check compliance with the new first-time home homebuyer tax credit resulting from 2008 and 2009 legislation. Two aspects of the credit lend themselves to an automated approach.

• One is the requirement that the 2008 credit be repaid in increments of up to $500 per taxpayer for 15 years beginning in 2011. IRS estimates that 1.2 million taxpayers claimed the 2008 credit for a total of approximately $8.6 billion. 

• The other is that a taxpayer cannot claim the first-time homebuyer credit in both 2008 and 2009.

• The number of taxpayers claiming the credit and the amounts at risk per taxpayer mean that auditing every credit claimed may not be cost-effective. 

• IRS lacks math error authority, which must be provided by statute, to use taxpayers’ prior year return information to check for compliance with these two provisions. Math error checks are suitable for checking compliance with these provisions because, for many tax returns, the requirement to repay and violations of the limit on 

multiple claims will be obvious from the prior year’s return. Because math error 

checks are automated, with this authority, IRS could check all returns at relatively low cost.

Page 20 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

14

Conclusion

• As IRS prepares for the 2010 filing season, it has opportunities to improve service to millions of taxpayers and reduce its own operating costs by reducing electronic filing reject rates and providing more automated services. If IRS were to take advantage of these opportunities, it may be able to reduce the volume of taxpayer phone calls, which would improve taxpayer access to IRS assistors. 

• To realize maximum benefit for the 2010 filing season from its new automated application for authenticating electronic filers, IRS will need to adhere to its 

implementation date of January 18, 2010. The beginning of the filing season is when many taxpayers file returns electronically in order to receive their refund. Any slippage in the schedule means that taxpayers wishing to file electronically will have little option but to contact an IRS assistor. Missing this early window in 2010 could 

also delay the potential benefits to both taxpayers and IRS of an improved

authentication system for early filers until the 2011 filing season. 

• We also identified two opportunities for Congress to provide IRS with additional authority to improve compliance for the 2010 filing season and beyond and reduce 

its costs by extending math error authority to cover two aspects of the first-time 

homebuyer tax credit. Compared to audits, automated math error checks provide a low-cost option that may be particularly useful as IRS confronts the challenges of 

ensuring compliance with new tax law provisions. 

Page 21 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

15

Matters for Congressional Consideration

Given the potential for improving compliance for the next filing season and beyond, 

the Congress should consider providing IRS with math error authority to use prior 

years’ tax return information to automatically

• verify taxpayers’ compliance with the 2008 first-time homebuyer credit payback provision and 

• ensure that taxpayers do not improperly claim the credit in multiple years.

Page 22 GAO-09-1026 Tax Administration
Appendix I: Updated Slides from the 

September 1, 2009, Briefing 

16

Recommendations for Executive Action 

The Commissioner of Internal Revenue should ensure that IRS

1. develops and documents a strategy to prevent and resolve errors causing electronically filed returns to be rejected; 

2. involves stakeholders from the paid preparer and tax software industries in its 

current reject working group; 

3. develops an action plan for its reject working group that includes such elements as the scope of responsibility, a plan for testing changes, and a schedule for 

implementing changes; 

4. provides paid preparers and software providers with clearer descriptions of why electronically filed returns are rejected; and

5. implements a low cost automated method for providing volunteer site locations and 

hours of operation to taxpayers.

Page 23 GAO-09-1026 Tax Administration
Appendix II: Most Common Error Reject 

Codes in the 2009 Filing Season and IRS 

Descriptions 

Of the more than 600 possible error reject codes that the Internal Revenue 

Service (IRS) sent to taxpayers attempting to file electronically during the 

2009 filing season, table 1 lists 15 of the most common. These error codes 

accounted for 85 percent of all error reject codes included in the 

electronic acknowledgments received by taxpayers through paid preparers 

and software providers. 

Table 1: Most Common Error Reject Codes and IRS Descriptions for the 2009 Filing Season 

Error reject code 

IRS explanations of error reject 

codes contained in electronic 

acknowledgmentsa

Clearer description found on IRS’s 

Web site 

Percentage 

of error 

incidences

Cumulative 

percentage

0679 Authentication Record – When the 

PIN TYPE Code (SEQ 0008) equals 

“S” or “O”, the Primary Prior Year 

Adjusted Gross Income (SEQ 0020) 

or Primary Prior Year PIN (SEQ 

0025) must match the Primary Prior 

Year Adjusted Gross Income or 

Primary Prior Year PIN on the IRS 

Master File. 

The primary taxpayer’s or spouse’s 

Prior Year Adjusted Gross Income 

(Prior Year AGI) or the Prior Year PIN 

entered on the Authentication Record 

does not match the original Prior Year 

AGI or Prior Year PIN entered on Form 

8879, IRS e-file Signature 

Authorization. 

19.7 19.7

0504 Dependent’s SSN (SEQ 0175, 0185, 

0195, 0205) of Form 1040/1040A and 

corresponding Dependent Name 

Control (SEQ 0172, 0182, 0192, 

0202) must match data from the IRS 

Master File. 

Qualifying Child SSN (SEQ +0175, 

0185, 0195, 0205) of Form 1040-SS 

(PR) and corresponding Qualifying 

Child Name Control (SEQ +0172, 

0182, 0192, 0202) must match data 

from the IRS Master File. 

The last name of the dependent on the 

return does not match the IRS Master 

File and/or SSA records. 

This could be caused by misspelling the 

last name or using the wrong SSN. It 

can also result if the dependent has 

multiple or hyphenated last names. 

9.1 28.8

0269b Form 1040/1040A/1040EZ - 

Recovery Rebate Credit (SEQ 1220) 

cannot be claimed because the 

maximum amount has already been 

received based on the information 

contained on the 2007 tax return. 

NA 8.1 36.9

Appendix II: Most Common Error Reject 

Codes in the 2009 Filing Season and IRS 

Descriptions 

Page 24 GAO-09-1026 Tax Administration
Appendix II: Most Common Error Reject 

Codes in the 2009 Filing Season and IRS 

Descriptions 

Error reject code 

IRS explanations of error reject 

codes contained in electronic 

acknowledgmentsa

Clearer description found on IRS’s 

Web site 

Percentage 

of error 

incidences

Cumulative 

percentage

0502 Employer Identification Number (SEQ 

0040) of Form W-2 and/or 

W-2GU, Payer Identification Number 

(SEQ 0026) of Form W-2G, 

and Payer Identification Number 

(SEQ 0050) of Form 1099-R 

and Company or Trust Identification 

Number (SEQ 0120) of 

Form 2439, and Employer EIN (SEQ 

0200) of 499R-2/W-2PR Record must 

match data from the IRS Master File. 

Note: Form 1099-R is ONLY required 

when federal income tax is withheld. 

The Employer Identification Number 

(EIN) of the business reported on 

Form(s) W-2, W-2G, W-2GU, 499R2/W-2PR, 1099R, or 2439 must match 

the EIN on the IRS Master File. This 

error could be caused by entering the 

EIN incorrectly or using an EIN that is 

invalid. 

6.1 43.0

0522 Primary Date of Birth (SEQ 0010) in 

the Authentication Record of an 

Online Return does not match data 

from the IRS Master File. 

The Date of Birth (DOB) of the primary 

taxpayer (ERC 0522) or spouse (ERC 

0523) does not match the IRS Master 

File. The DOB is required to 

authenticate the taxpayer’s Self-Select 

PIN which acts as the taxpayers’ 

signature when filing an online return. 

5.8 48.8

0507 Dependent’s SSN (SEQ 0175, 0185, 

0195, 0205) of Form 1040/1040A 

was previously used for the same 

purpose. 

The dependent’s SSN claimed on the 

tax return and/or Schedule EIC has 

been used on another tax return. This 

could be the result of an inadvertent 

data entry error or someone else has 

claimed this dependent. 

5.7 54.5

0500 Primary SSN (SEQ 0010) and 

Primary Name Control (SEQ 0050) of 

the Tax Form must match data from 

the IRS Master File. 

The last name for the primary taxpayer 

on the return does not match what the 

IRS and/or the Social Security 

Administration (SSA) have on file. This 

could be caused by misspelling the 

primary taxpayer’s last name or using 

the wrong SSN for the primary 

taxpayer. It can also result if the primary 

taxpayer has multiple or hyphenated 

last names, or has changed their last 

name (e.g., by marriage or court order) 

and has not notified SSA. 

5.4 59.9

Page 25 GAO-09-1026 Tax Administration
Appendix II: Most Common Error Reject 

Codes in the 2009 Filing Season and IRS 

Descriptions 

Error reject code 

IRS explanations of error reject 

codes contained in electronic 

acknowledgmentsa

Clearer description found on IRS’s 

Web site 

Percentage 

of error 

incidences

Cumulative 

percentage

0501 Qualifying SSN (SEQ 0015, 0085) of 

Schedule EIC and the corresponding 

Qualifying Child Name Control (SEQ 

0007, 0077) must match data from 

the IRS Master File. 

The SSN and last name entered for the 

qualifying child does not match what the 

IRS and/or SSA have on file. The 

qualifying SSN of the dependent on 

Schedule EIC, Earned Income Credit, 

must match data from the IRS Master 

File. 

This could be a companion error code 

to Reject Code 0504. If the child does 

not qualify as a dependent, the child is 

not eligible to be a qualifying child for 

EIC. 

4.5 64.4

0680 Authentication Record – When the 

PIN TYPE Code (SEQ 0008) equals 

“S” or “O” and the Filing Status (SEQ 

0130) is “2” (Married Filing Jointly) on 

the return, the Spouse Prior Year 

Adjusted Gross Income (SEQ 0050) 

or Spouse Prior Year PIN (SEQ 

0055) must match the Spouse Prior 

Year Adjusted Gross Income or 

Spouse Prior Year PIN on the IRS 

Master File. 

The primary taxpayer’s or spouse’s 

Prior Year Adjusted Gross Income 

(Prior Year AGI) or the Prior Year PIN 

entered on the Authentication Record 

does not match the original Prior Year 

AGI or Prior Year PIN entered on Form 

8879, IRS e-file Signature 

Authorization. 

4.4 68.8

0510 Primary SSN (SEQ 0010) and/or 

Secondary SSN (SEQ 0030) where 

the SSN was claimed as an 

exemption (SEQ 0160) and/or (SEQ 

0163) on the return and was also 

used as a Dependent’s SS Non Form 

1040 or Qualifying Child on Form 

1040-SS(PR) (SEQ 0175, 0185, 

0195, 0205)on another return. 

Dependent’s SSN (SEQ 0175, 0185, 

0195, 0205) was used as a Primary 

SSN (SEQ 0010) or Secondary SSN 

(SEQ 0030) on another return and 

was claimed as an exemption (SEQ 

0160) on that return. 

Normally, this error is the result of a 

child submitting their own tax return and 

claiming their own exemption. When the 

parent(s) file and claim the child as a 

dependent, the parents’ return will 

reject with ERC 0510. 

Example 1: A college student submits 

their own return and fails to indicate that 

they can be claimed as a dependent on 

another return. When the parents 

submit their return after the student has 

filed, and attempts to claim the student 

as a dependent, the return will reject. 

Example 2: A newly married couple files 

a joint return. When the parents submit 

their return after the couple has filed, 

and attempt to claim their daughter as a 

dependent, the return will reject. 

Using an incorrect SSN may also cause 

this error if the erroneous SSN matches 

another taxpayer or dependent. 

4.0 72.9

Page 26 GAO-09-1026 Tax Administration
Appendix II: Most Common Error Reject 

Codes in the 2009 Filing Season and IRS 

Descriptions 

Error reject code 

IRS explanations of error reject 

codes contained in electronic 

acknowledgmentsa

Clearer description found on IRS’s 

Web site 

Percentage 

of error 

incidences

Cumulative 

percentage

0503 Secondary SSN (SEQ 0030) and 

Spouse’s Name Control (SEQ 0055) 

of the Tax Form must match data 

from the IRS Master File 

or 

If filing status (SEQ 0130) equals “4” 

and Exempt Spouse (SEQ 0163) 

equals “X”, then the Spouse SSN 

(SEQ 0030) and Exempt Spouse 

Name Control (SEQ 0165) must 

match data from the IRS Master File. 

The last name for the secondary 

taxpayer on the return does not match 

the IRS Master File and/or SSA 

records. 

This can be caused by misspelling the 

last name or using the wrong SSN. It 

can also result if the spouse has 

multiple or hyphenated last names, or 

has changed their last name (e.g., 

marriage or court order) and has not 

notified the SSA. 

3.5 76.3

0515bPrimary SSN (SEQ 0010) was used 

as a Primary SSN more than once. 

NA 2.8 79.1

0506 Schedule EIC – Qualifying SSN (SEQ 

0015, 0085) of Schedule EIC was 

previously used for the same 

purpose. 

The qualifying child’s SSN listed for the 

purpose of claiming EIC has been used 

on another tax return. This could be the 

result of an inadvertent data entry error 

or someone else has claimed this 

dependent. This is often a companion 

to Reject Code 0507. The qualifying 

child for EIC purposes must be a 

qualifying dependent. 

2.4 81.5

0523 Spouse Date of Birth (SEQ 0040) in 

the Authentication Record of an 

Online Return does not match data 

from the IRS Master File. 

The Date of Birth (DOB) of the primary 

taxpayer (ERC 0522) or spouse (ERC 

0523) does not match the IRS Master 

File. The DOB is required to 

authenticate the taxpayer’s Self-Select 

PIN which acts as the taxpayers’ 

signature when filing an online return. 

1.9 83.4

0535 Schedule EIC - Qualifying SSN (SEQ 

0015, 0085) of Schedule EIC and the 

corresponding Year of Birth (SEQ 

0020, 0090) must match data 

received from the Social Security 

Administration. 

The year of birth for the qualifying child 

does not match what the IRS and/or 

SSA have on file. The qualifying SSN of 

the dependent on Schedule EIC, 

Earned Income Credit, must match data 

from the IRS Master File. 

1.8 85.2

Total of all other error reject codes 14.8 100

Source: GAO analysis of IRS data. 

Note: Data are from January 1, 2009 through August 19, 2009. 

a

Exceptions not shown. 

b

Error Reject Code does not have a simplified description on IRS’s Web site. 

Page 27 GAO-09-1026 Tax Administration
Appendix III: GAO

A

 Contact and Staff 

cknowledgments 

Page 28 GAO-09-1026 

Appendix III: GAO Contact and Staff 

Acknowledgments 

James R. White, (202) 512-9110 or whitej@gao.gov

In addition to the contact named above, Joanna M. Stamatiades, Assistant 

Director; Vida Awumey, John Dell’Osso, Kara Eusebio, Melanie Helser, 

Lina Khan, Kirsten B. Lauber, Angela Leventis, Natalie Maddox, Karen V. 

O’Conor, Neil A. Pinney, and Sabrina C. Streagle made key contributions 

to this report. 

 Tax Administration 

GAO Contact 

Acknowledgments 

(450792) 
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