§ 416(g)(4)(H) stipulates:
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Cash or deferred arrangements using alternative methods of meeting nondiscrimination requirements The term "top-heavy plan" shall not include a plan which consists solely of- (i) a cash or deferred arrangement which meets the requirements of section 401(k)(12) or 401(k)(13), and (ii) matching contributions with respect to which the requirements of section 401(m)(11) or 401(m)(12) are met.
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https://www.irs.gov/pub/irs-drop/rr-04-13.pdf Rev. Rul. 2004-13: Section 416(g)(4)(H) provides that the term "top-heavy plan" does not include a plan that consists solely of (1) a CODA that meets the requirements of § 401(k)(12) and (2) matching
contributions that meet the requirements of § 401(m)(11). Section 416(g)(4)(H), which is effective for years beginning after December 31, 2001, was added to the Code by the Economic Growth and Tax Relief Reconciliation Act of 2001, Pub. L. 107-16.
Rev. Rul. 2004-13 presents the following hypothetical scenario:
Situation 1. A nongovernmental profit-sharing plan containing a cash or deferred arrangement ("CODA") described in § 401(k) provides for safe harbor matching contributions that are intended to satisfy the requirements of § 401(k)(12)(B) and otherwise satisfies the requirements of § 401(k)(12). The plan also permits the employer to make a nonelective contribution for any plan year at the employer's discretion. The nonelective contribution is subject to 5-year vesting described in § 411(a)(2)(A) and is allocated to
participants' accounts in the same ratio that each participant's compensation bears to the compensation of all participants. The plan is a calendar-year plan and covers all employees of the employer (including highly compensated employees as defined in § 414(q)) who have 1 year of service and are age 21 or older. Other than elective contributions and the matching contributions, no other contributions are made to the plan for 2004 and there are no forfeitures.
Later on, Rev. Rul. 2004-13 features:
In Situation 1, although the plan provides for discretionary nonelective contributions, none are made for 2004 and thus only contributions described in § 401(k)(12) or § 401(m)(11) are made to the plan for that year. In Situation 1, the plan meets the requirements of § 416(g)(4)(H) and is therefore not subject to the top-heavy rules in § 416 for
2004 because no other contributions are made to the plans other than contributions described in § 401(k)(12) or § 401(m)(11).
So, to present a salient inquiry, if a plan as the option for the endorsing employer to make an allocation (compensation to compensation, permitted disparity, set dollar amount, set percentage, etc.), and that plan has a CODA feature, if in one particular year the employer does not avail of said allocation option, and only makes safe harbor CODA contributions, the plan stands deemed as passing § 416 strictures. If an employee other than a key employee lacks an allocation for that year, due to a lack of deferrals if the safe harbor contribution occurs as a matching contribution that serves as a function of a deferral, then the compliance with § 416 strictures remains intact. Please indicate if my understanding of the situation stands as
correct.