The fourth in our series of articles on the final 401(k) regulations focuses on the aggregation and disaggregation of plans.
Aggregation and Disaggregation Rules of the 401(k) Final Regulation
The aggregation and disaggregation rules for cash or deferred arrangements (CODAs) are found in Treasury Regulation 1.401(k)-1(b)(4). The final regulations consolidate the rules regarding identification of CODAs and plans for purposes of demonstrating compliance with the requirements of section 401(k). Paragraph (b)(4) of the final regulations contains the exclusive rules for aggregating and disaggregating plans for cash or deferred arrangements. This article provides a review of this section of the final regulations (with the exception of the Qualified Separate Line Of Business (QSLOB) and collectively bargained rules which will be in a later article).
Aggregation of cash or deferred arrangements within a plan .
All CODAs included in a plan are treated as a single CODA and a plan must apply a single ADP test with respect to all such arrangements within the plan (other than the exceptions listed below). For example, if two groups of employees are eligible for separate CODAs under the same plan, all contributions under both CODAs must be treated as made under a single CODA subject to a single test, even if they have significantly different features, such as different limits on elective contributions.
Aggregation of plans
In general , for purposes of this regulation, the term plan applies after application of the mandatory disaggregation rules, and the permissive aggregation rules, as modified by below. Thus, for example, two plans that are treated as a single plan pursuant to the permissive aggregation rules are treated as a single plan for purposes of sections 401(k) and (m).
Plans with inconsistent ADP testing methods .
After the application of the aggregation and disaggregation rules, a single testing method must apply with respect to all CODAs under a plan. However, in applying the permissive aggregation rules, an employer may not aggregate plans that apply inconsistent testing methods. For example, a plan that applies the current year testing method may not be aggregated with another plan that applies the prior year testing method. Similarly, an employer may not aggregate a plan using the ADP safe harbor provisions and another plan that is subject to the ADP test.
Disaggregation of plans and separate testing
If a CODA is included in a plan that is mandatorily disaggregated for coverage, the CODA must be disaggregated in a consistent manner.
For example, a CODA that allows employees to participate before they have met the section 410(b)(1) minimum age and service requirements must be treated as two separate arrangements, one comprising all eligible employees who have met the age and service requirements and one comprising all eligible employees who have not met the age and service requirements. This disaggregation is required unless the plan performs the ADP test using all of the HCEs and only NHCEs who have satisfied age and service (as permitted in §1.401(k)-2(a)(1)(iii)(A)).
Example 1. Otherwise excludable