(1) by redesignating subsection (o) as sub-
section (p); and 
(2) by inserting after subsection (n) the fol-
lowing new subsection: 
‘‘(o) 
SPECIAL
RULES
FOR
APPLYING
NON-
DISCRIMINATION RULES TO PROTECT OLDER, LONGER 
SERVICE AND GRANDFATHERED PARTICIPANTS.— 
‘‘(1) TESTING
OF
DEFINED
BENEFIT
PLANS 
WITH CLOSED CLASSES OF PARTICIPANTS.— 
‘‘(A) BENEFITS, RIGHTS, OR
FEATURES 
PROVIDED
TO
CLOSED
CLASSES.—A defined 
benefit plan which provides benefits, rights, or 
features to a closed class of participants shall 
not fail to satisfy the requirements of sub-
section (a)(4) by reason of the composition of 
such closed class or the benefits, rights, or fea-
tures provided to such closed class, if— 
‘‘(i) for the plan year as of which the 
class closes and the 2 succeeding plan 
years, such benefits, rights, and features 
satisfy the requirements of subsection 
(a)(4) (without regard to this subpara-
graph but taking into account the rules of 
subparagraph (I)), 
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‘‘(ii) after the date as of which the 
class was closed, any plan amendment 
which modifies the closed class or the ben-
efits, rights, and features provided to such 
closed class does not discriminate signifi-
cantly in favor of highly compensated em-
ployees, and 
‘‘(iii) the class was closed before Sep-
tember 21, 2016, or the plan is described 
in subparagraph (C). 
‘‘(B) AGGREGATE TESTING WITH DEFINED 
CONTRIBUTION PLANS PERMITTED ON A BENE-
FITS BASIS.— 
‘‘(i) IN
GENERAL.—For purposes of 
determining compliance with subsection 
(a)(4) and section 410(b), a defined benefit 
plan described in clause (iii) may be aggre-
gated and tested on a benefits basis with 
1 or more defined contribution plans, in-
cluding with the portion of 1 or more de-
fined contribution plans which— 
‘‘(I) provides matching contribu-
tions 
(as 
defined 
in 
subsection 
(m)(4)(A)), 
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‘‘(II) provides annuity contracts 
described in section 403(b) which are 
purchased with matching contribu-
tions or nonelective contributions, or 
‘‘(III) consists of an employee 
stock ownership plan (within the 
meaning of section 4975(e)(7)) or a 
tax credit employee stock ownership 
plan (within the meaning of section 
409(a)). 
‘‘(ii) SPECIAL RULES FOR MATCHING 
CONTRIBUTIONS.—For purposes of clause 
(i), if a defined benefit plan is aggregated 
with a portion of a defined contribution 
plan providing matching contributions— 
‘‘(I) such defined benefit plan 
must also be aggregated with any por-
tion of such defined contribution plan 
which provides elective deferrals de-
scribed in subparagraph (A) or (C) of 
section 402(g)(3), and 
‘‘(II) such matching contribu-
tions shall be treated in the same 
manner as nonelective contributions, 
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including for purposes of applying the 
rules of subsection (l). 
‘‘(iii) PLANS DESCRIBED.—A defined 
benefit plan is described in this clause if— 
‘‘(I) the plan provides benefits to 
a closed class of participants, 
‘‘(II) for the plan year as of 
which the class closes and the 2 suc-
ceeding plan years, the plan satisfies 
the requirements of section 410(b) 
and subsection (a)(4) (without regard 
to this subparagraph but taking into 
account the rules of subparagraph 
(I)), 
‘‘(III) after the date as of which 
the class was closed, any plan amend-
ment which modifies the closed class 
or the benefits provided to such closed 
class does not discriminate signifi-
cantly in favor of highly compensated 
employees, and 
‘‘(IV) the class was closed before 
September 21, 2016, or the plan is 
described in subparagraph (C). 
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‘‘(C) PLANS DESCRIBED.—A plan is de-
scribed in this subparagraph if, taking into ac-
count any predecessor plan— 
‘‘(i) such plan has been in effect for 
at least 5 years as of the date the class is 
closed, and 
‘‘(ii) during the 5-year period pre-
ceding the date the class is closed, there 
has not been a substantial increase in the 
coverage or value of the benefits, rights, or 
features described in subparagraph (A) or 
in the coverage or benefits under the plan 
described in subparagraph (B)(iii) (which-
ever is applicable). 
‘‘(D) DETERMINATION
OF
SUBSTANTIAL 
INCREASE FOR BENEFITS, RIGHTS, AND FEA-
TURES.—In applying subparagraph (C)(ii) for 
purposes of subparagraph (A)(iii), a plan shall 
be treated as having had a substantial increase 
in coverage or value of the benefits, rights, or 
features described in subparagraph (A) during 
the applicable 5-year period only if, during such 
period— 
‘‘(i) the number of participants cov-
ered by such benefits, rights, or features 
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on the date such period ends is more than 
50 percent greater than the number of 
such participants on the first day of the 
plan year in which such period began, or 
‘‘(ii) such benefits, rights, and fea-
tures have been modified by 1 or more 
plan amendments in such a way that, as of 
the date the class is closed, the value of 
such benefits, rights, and features to the 
closed class as a whole is substantially 
greater than the value as of the first day 
of such 5-year period, solely as a result of 
such amendments. 
‘‘(E) DETERMINATION
OF
SUBSTANTIAL 
INCREASE FOR AGGREGATE TESTING ON BENE-
FITS BASIS.—In applying subparagraph (C)(ii) 
for purposes of subparagraph (B)(iii)(IV), a 
plan shall be treated as having had a substan-
tial increase in coverage or benefits during the 
applicable 5-year period only if, during such pe-
riod— 
‘‘(i) the number of participants bene-
fiting under the plan on the date such pe-
riod ends is more than 50 percent greater 
than the number of such participants on 
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the first day of the plan year in which such 
period began, or 
‘‘(ii) the average benefit provided to 
such participants on the date such period 
ends is more than 50 percent greater than 
the average benefit provided on the first 
day of the plan year in which such period 
began. 
‘‘(F) 
CERTAIN
EMPLOYEES
DIS-
REGARDED.—For purposes of subparagraphs 
(D) and (E), any increase in coverage or value 
or in coverage or benefits, whichever is applica-
ble, which is attributable to such coverage and 
value or coverage and benefits provided to em-
ployees— 
‘‘(i) who became participants as a re-
sult of a merger, acquisition, or similar 
event which occurred during the 7-year pe-
riod preceding the date the class is closed, 
or 
‘‘(ii) who became participants by rea-
son of a merger of the plan with another 
plan which had been in effect for at least 
5 years as of the date of the merger, 
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