3.4 Amending Plan Eligibility Requirements & Explaining Eligibility to Plan Sponsors

Why This Topic Carries Weight

Eligibility is 21% of the QKA-1 Plan Management exam — tied with Distributions as the single heaviest topic. Two of the nine official learning objectives for Eligibility are about change and communication rather than initial determination: "determine the effect of a change in a plan's eligibility requirements on current employees" and "explain eligibility to a plan sponsor." Those objectives are tested with fact patterns where the plan is amended mid-year and you must decide who stays in, who comes in, and who is still waiting.

The Statutory Ceilings That Bound Every Amendment

No amendment can push an eligibility condition past the limits in IRC §410(a)(1):

A sponsor who says "I want people to wait two years before they can defer" must be told: the plan can require two years for the profit-sharing source only, and even then only with immediate vesting — the 401(k) deferral source is capped at one year. This split-eligibility design is extremely common on the exam.

Tightening Eligibility: The Grandfather Rule

Suppose a plan currently has immediate entry and the sponsor amends to age 21 and one year of service, effective July 1.

1. Employees already participating stay in the plan. An amendment cannot expel an existing participant. The individual's account balance is a protected benefit under IRC §411(d)(6), and the accrued right to participate is not something a sponsor may claw back retroactively.
2. Employees hired before the amendment who have not yet entered are subject to the new conditions going forward, unless the amendment says otherwise. Most well-drafted amendments explicitly grandfather anyone employed on the effective date so that the sponsor avoids arguments and coverage surprises.
3. The amendment cannot be retroactive to strip participation already earned. A retroactive tightening that removed a participant mid-year would be an impermissible cutback and an operational failure requiring correction under EPCRS.

Administrator action item: when a tightening amendment lands on your desk, immediately produce two census lists — currently participating and hired-but-not-yet-entered — and confirm in writing which group the sponsor intends to grandfather. Ambiguity here is the single most common source of eligibility operational failures.

Loosening Eligibility: The Testing Consequence Nobody Warns the Sponsor About

Loosening is legally simple — there is no cutback issue when you let more people in — but it is operationally expensive, and explaining that trade-off is exactly what the "explain eligibility to a plan sponsor" objective is testing.

A sponsor amending from one year of service to three months of service should be told:

• The coverage testing group grows. Newly eligible employees who do not benefit are counted in the denominator of the IRC §410(b) ratio percentage test. If the new entrants are overwhelmingly NHCEs who do not defer, the NHCE benefiting percentage falls.
• The NHCE ADP almost always drops. Newly eligible short-service employees defer at low rates, and every eligible non-deferrer enters the ADP calculation at 0.00%. A plan running a comfortable 4.2% NHCE ADP can fall below 3% after opening the doors, tightening the HCE ceiling under the 2%-spread test.
• Top-heavy minimum cost rises. Every non-key participant who is employed on the last day of a top-heavy plan year is owed the 3% minimum contribution under IRC §416, regardless of hours worked or whether they deferred.
• The otherwise excludable election becomes valuable. Because the plan now covers employees who could still be statutorily excluded (under 21 / under one year), the plan can disaggregate them under IRC §410(b)(4)(B) and test the two groups separately — often rescuing both coverage and ADP.

Job-Classification Exclusions: The Question Every Sponsor Asks

Sponsors constantly ask to "just exclude part-timers." The correct QKA answer has three parts:

1. A plan may exclude employees by bona fide job classification — division, location, job title, hourly vs. salaried — because a classification exclusion is not an age or service condition.
2. A classification may not be a disguised service condition. Excluding "employees who work fewer than 1,000 hours" is an indirect service requirement and is impermissible dressed up as a classification. Excluding "employees classified as seasonal staff of the Retail Division" is a classification.
3. The excluded group still counts. Excluded employees are non-benefiting members of the testing group for IRC §410(b), so a broad classification exclusion is only sustainable if the plan still passes coverage. And since 2025, long-term part-time employees who complete 500 hours in two consecutive years must be permitted to make elective deferrals regardless of any classification exclusion.

Worked Scenario: Mid-Year Tightening at Cedar Ridge Manufacturing

Cedar Ridge sponsors a calendar-year 401(k) with immediate eligibility and monthly entry. Effective July 1, 2026, it amends to age 21 and one Year of Service, with semi-annual entry dates (January 1 and July 1). The amendment grandfathers all employees who are participants on June 30, 2026.

The trap on the exam is Ben and Devon. Candidates routinely answer that Ben "has not met the new service condition so he is out," and that Devon "is under 21 so he is out." Both are already participants; an eligibility amendment operates prospectively on entry, never retroactively on participation.

Explaining Eligibility to a Sponsor: A Four-Sentence Script

The exam rewards the ability to translate. A defensible plain-language explanation contains four elements:

1. The rule: "Your plan lets employees in after they turn 21 and complete a year with at least 1,000 hours."
2. The entry date: "Once they hit that, they come in on the next January 1 or July 1."
3. The legal floor: "We cannot make anyone wait longer than that — the tax code caps it."
4. The consequence of change: "If we shorten the wait, more people are counted in our nondiscrimination tests, which usually lowers what the owners can defer."

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Common ASPPA QKA Exam Traps

• Trap 1 — Retroactive expulsion. An amendment tightening eligibility never removes an existing participant. Look for answer choices that "remove" someone; they are wrong.
• Trap 2 — The two-year rule and 401(k). Two Years of Service is permitted only with 100% immediate vesting and never for elective deferrals.
• Trap 3 — Hours-based exclusions. "Excludes employees working under 1,000 hours" is an illegal indirect service condition, not a valid classification.
• Trap 4 — Forgetting the coverage cost of loosening. Questions about "what should you tell the sponsor" almost always want the coverage/ADP/top-heavy consequence, not just "yes, that is allowed."
• Trap 5 — LTPT overrides classification exclusions. A part-time classification exclusion cannot block deferrals for an employee who has met the 500-hour, two-consecutive-year standard.