This Act may be cited as the “Retirement Security Preservation Act of 2017”.

(a) In general.—Section 401 of the Internal Revenue Code of 1986 is amended—

(1) by redesignating subsection (o) as subsection (p), and

(2) by inserting after subsection (n) the following new subsection:

“(o) Special rules for applying nondiscrimination 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 subsection (a)(4) by reason of the composition of such closed class or the benefits, rights, or features 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 subparagraph but taking into account the rules of subparagraph (I)),

“(ii) after the date as of which the class was closed, any plan amendment which modifies the closed class or the benefits, rights, and features provided to such closed class does not discriminate significantly in favor of highly compensated employees (determined as of the effective date of the amendment), and

“(iii) the class was closed before April 5, 2017, or the plan is described in subparagraph (C).

“(B) AGGREGATE TESTING WITH DEFINED CONTRIBUTION PLANS PERMITTED ON A BENEFITS 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 aggregated and tested on a benefits basis with 1 or more defined contribution plans, including with the portion of 1 or more defined contribution plans which—

“(I) provides matching contributions (as defined in subsection (m)(4)(A)),

“(II) provides annuity contracts described in section 403(b) which are purchased with matching contributions 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 portion of such defined contribution plan which provides elective deferrals described in subparagraph (A) or (C) of section 402(g)(3), and

“(II) such matching contributions shall be treated in the same manner as nonelective contributions, 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 succeeding 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 amendment which modifies the closed class or the benefits provided to such closed class does not discriminate significantly in favor of highly compensated employees (determined as of the effective date of the amendment), and

“(IV) the class was closed before April 5, 2017, or the plan is described in subparagraph (C).

“(C) PLANS DESCRIBED.—A plan is described in this subparagraph if, taking into account 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 preceding 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) (whichever is applicable).

“(D) DETERMINATION OF SUBSTANTIAL INCREASE FOR BENEFITS, RIGHTS, AND FEATURES.—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 covered by such benefits, rights, or features 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 features 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 BENEFITS BASIS.—In applying subparagraph (C)(ii) for purposes of subparagraph (B)(iii)(IV), a plan shall be treated as having had a substantial increase in coverage or benefits during the applicable 5-year period only if, during such period—

“(i) the number of participants benefitting under the plan 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) 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 DISREGARDED.—For purposes of subparagraphs (D) and (E), any increase in coverage or value or in coverage or benefits, whichever is applicable, which is attributable to such coverage and value or coverage and benefits provided to employees—

“(i) who became participants as a result of a merger, acquisition, or similar event which occurred during the 7-year period preceding the date the class is closed, or

“(ii) who became participants by reason 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,

shall be disregarded, except that clause (ii) shall apply for purposes of subparagraph (D) only if, under the merger, the benefits, rights, or features under 1 plan are conformed to the benefits, rights, or features of the other plan prospectively.

“(G) RULES RELATING TO AVERAGE BENEFIT.—For purposes of subparagraph (E)—

“(i) the average benefit provided to participants under the plan will be treated as having remained the same between the 2 dates described in subparagraph (E)(ii) if the benefit formula applicable to such participants has not changed between such dates, and

“(ii) if the benefit formula applicable to 1 or more participants under the plan has changed between such 2 dates, then the average benefit under the plan shall be considered to have increased by more than 50 percent only if—

“(I) the total amount determined under section 430(b)(1)(A)(i) for all participants benefitting under the plan for the plan year in which the 5-year period described in subparagraph (E) ends, exceeds

“(II) the total amount determined under section 430(b)(1)(A)(i) for all such participants for such plan year, by using the benefit formula in effect for each such participant for the first plan year in such 5-year period,

by more than 50 percent. In the case of a CSEC plan (as defined in section 414(y)), the normal cost of the plan (as determined under section 433(j)(1)(B)) shall be used in lieu of the amount determined under section 430(b)(1)(A)(i).

“(H) TREATMENT AS SINGLE PLAN.—For purposes of subparagraphs (E) and (G), a plan described in section 413(c) shall be treated as a single plan rather than as separate plans maintained by each participating employer.

“(I) SPECIAL RULES.—For purposes of subparagraphs (A)(i) and (B)(iii)(II), the following rules shall apply:

“(i) In applying section 410(b)(6)(C), the closing of the class of participants shall not be treated as a significant change in coverage under section 410(b)(6)(C)(i)(II).

“(ii) Two or more plans shall not fail to be eligible to be aggregated and treated as a single plan solely by reason of having different plan years.

“(iii) Changes in the employee population shall be disregarded to the extent attributable to individuals who become employees or cease to be employees, after the date the class is closed, by reason of a merger, acquisition, divestiture, or similar event.

“(iv) Aggregation and all other testing methodologies otherwise applicable under subsection (a)(4) and section 410(b) may be taken into account.

The rule of clause (ii) shall also apply for purposes of determining whether plans to which subparagraph (B)(i) applies may be aggregated and treated as 1 plan for purposes of determining whether such plans meet the requirements of subsection (a)(4) and section 410(b).

“(J) SPUN-OFF PLANS.—For purposes of this paragraph, if a portion of a defined benefit plan described in subparagraph (A) or (B)(iii) is spun off to another employer and the spun-off plan continues to satisfy the requirements of—

“(i) subparagraph (A)(i) or (B)(iii)(II), whichever is applicable, if the original plan was still within the 3-year period described in such subparagraph at the time of the spin off, and

“(ii) subparagraph (A)(ii) or (B)(iii)(III), whichever is applicable,

the treatment under subparagraph (A) or (B) of the spun-off plan shall continue with respect to such other employer.

“(2) TESTING OF DEFINED CONTRIBUTION PLANS.—

“(A) TESTING ON A BENEFITS BASIS.—A defined contribution plan shall be permitted to be tested on a benefits basis if—

“(i) such defined contribution plan provides make-whole contributions to a closed class of participants whose accruals under a defined benefit plan have been reduced or eliminated,

“(ii) for the plan year of the defined contribution plan as of which the class eligible to receive such make-whole contributions closes and the 2 succeeding plan years, such closed class of participants satisfies the requirements of section 410(b)(2)(A)(i) (determined by applying the rules of paragraph (1)(I)),

“(iii) after the date as of which the class was closed, any plan amendment to the defined contribution plan which modifies the closed class or the allocations, benefits, rights, and features provided to such closed class does not discriminate significantly in favor of highly compensated employees (determined as of the effective date of the amendment), and

“(iv) the class was closed before April 5, 2017, or the defined benefit plan under clause (i) is described in paragraph (1)(C) (as applied for purposes of paragraph (1)(B)(iii)(IV)).

“(B) AGGREGATION WITH PLANS INCLUDING MATCHING CONTRIBUTIONS.—

“(i) IN GENERAL.—With respect to 1 or more defined contribution plans described in subparagraph (A), for purposes of determining compliance with subsection (a)(4) and section 410(b), the portion of such plans which provides make-whole contributions or other nonelective contributions may be aggregated and tested on a benefits basis with the portion of 1 or more other defined contribution plans which—

“(I) provides matching contributions (as defined in subsection (m)(4)(A)),

“(II) provides annuity contracts described in section 403(b) which are purchased with matching contributions 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.—Rules similar to the rules of paragraph (1)(B)(ii) shall apply for purposes of clause (i).

“(C) SPECIAL RULES FOR TESTING DEFINED CONTRIBUTION PLAN FEATURES PROVIDING MATCHING CONTRIBUTIONS TO CERTAIN OLDER, LONGER SERVICE PARTICIPANTS.—In the case of a defined contribution plan which provides benefits, rights, or features to a closed class of participants whose accruals under a defined benefit plan have been reduced or eliminated, the plan shall not fail to satisfy the requirements of subsection (a)(4) solely by reason of the composition of the closed class or the benefits, rights, or features provided to such closed class if the defined contribution plan and defined benefit plan otherwise meet the requirements of subparagraph (A) but for the fact that the make-whole contributions under the defined contribution plan are made in whole or in part through matching contributions.

“(D) SPUN-OFF PLANS.—For purposes of this paragraph, if a portion of a defined contribution plan described in subparagraph (A) or (C) is spun off to another employer, the treatment under subparagraph (A) or (C) of the spun-off plan shall continue with respect to the other employer if such plan continues to comply with the requirements of clauses (ii) (if the original plan was still within the 3-year period described in such clause at the time of the spin off) and (iii) of subparagraph (A), as determined for purposes of subparagraph (A) or (C), whichever is applicable.

“(3) DEFINITIONS.—For purposes of this subsection—

“(A) MAKE-WHOLE CONTRIBUTIONS.—Except as otherwise provided in paragraph (2)(C), the term ‘make-whole contributions’ means nonelective allocations for each employee in the class which are reasonably calculated, in a consistent manner, to replace some or all of the retirement benefits which the employee would have received under the defined benefit plan and any other plan or qualified cash or deferred arrangement under subsection (k)(2) if no change had been made to such defined benefit plan and such other plan or arrangement. For purposes of the preceding sentence, consistency shall not be required with respect to employees who were subject to different benefit formulas under the defined benefit plan.

“(B) REFERENCES TO CLOSED CLASS OF PARTICIPANTS.—References to a closed class of participants and similar references to a closed class shall include arrangements under which 1 or more classes of participants are closed, except that 1 or more classes of participants closed on different dates shall not be aggregated for purposes of determining the date any such class was closed.

“(C) HIGHLY COMPENSATED EMPLOYEE.—The term ‘highly compensated employee’ has the meaning given such term in section 414(q).

“(D) DISCRIMINATORY AMENDMENTS.—A plan amendment shall be treated as discriminating significantly in favor of highly compensated employees only if such amendment, if adopted before the enactment of this subsection, would have been treated as violating subsection (a)(4).”.

(b) Participation requirements.—Paragraph (26) of section 401(a) of the Internal Revenue Code of 1986 is amended by adding at the end the following new subparagraph:

“(I) PROTECTED PARTICIPANTS.—

“(i) IN GENERAL.—A plan shall be deemed to satisfy the requirements of subparagraph (A) if—

“(I) the plan is amended—

“(aa) to cease all benefit accruals, or

“(bb) to provide future benefit accruals only to a closed class of participants,

“(II) the plan satisfies subparagraph (A) (without regard to this subparagraph) as of the effective date of the amendment, and

“(III) the amendment was adopted before April 5, 2017, or the plan is described in clause (ii).

“(ii) PLANS DESCRIBED.—A plan is described in this clause if the plan would be described in subsection (o)(1)(C), as applied for purposes of subsection (o)(1)(B)(iii)(IV) and by treating the effective date of the amendment as the date the class was closed for purposes of subsection (o)(1)(C).

“(iii) SPECIAL RULES.—For purposes of clause (i)(II), in applying section 410(b)(6)(C), the amendments described in clause (i) shall not be treated as a significant change in coverage under section 410(b)(6)(C)(i)(II).

“(iv) SPUN-OFF PLANS.—For purposes of this subparagraph, if a portion of a plan described in clause (i) is spun off to another employer, the treatment under clause (i) of the spun-off plan shall continue with respect to the other employer.”.

(c) Effective date.—

(1) IN GENERAL.—Except as provided in paragraph (2), the amendments made by this section shall take effect on the date of the enactment of this Act, without regard to whether any plan modifications referred to in such amendments are adopted or effective before, on, or after such date of enactment.

(2) SPECIAL RULES.—

(A) ELECTION OF EARLIER APPLICATION.—At the election of the plan sponsor, the amendments made by this section shall apply to plan years beginning after December 31, 2013.

(B) CLOSED CLASSES OF PARTICIPANTS.—For purposes of paragraphs (1)(A)(iii), (1)(B)(iii)(IV), and (2)(A)(iv) of section 401(o) of the Internal Revenue Code of 1986 (as added by this section), a closed class of participants shall be treated as being closed before April 5, 2017, if the plan sponsor's intention to create such closed class is reflected in formal written documents and communicated to participants before such date.

(C) CERTAIN POST-ENACTMENT PLAN AMENDMENTS.—A plan shall not be treated as failing to be eligible for the application of section 401(o)(1)(A), 401(o)(1)(B)(iii), or 401(a)(26) of such Code (as added by this section) to such plan solely because in the case of—

(i) such section 401(o)(1)(A), the plan was amended before the date of the enactment of this Act to eliminate 1 or more benefits, rights, or features, and is further amended after such date of enactment to provide such previously eliminated benefits, rights, or features to a closed class of participants, or

(ii) such section 401(o)(1)(B)(iii) or section 401(a)(26), the plan was amended before the date of the enactment of this Act to cease all benefit accruals, and is further amended after such date of enactment to provide benefit accruals to a closed class of participants.

Any such section shall only apply if the plan otherwise meets the requirements of such section and in applying such section, the date the class of participants is closed shall be the effective date of the later amendment.