IRC 416 Top-Heavy Rules: Key Employees, Minimums, and Vesting

Under Internal Revenue Code Section 416, the top-heavy rules apply to any qualified retirement plan in which key employees hold more than 60% of the total account balances or accrued benefits. When a plan crosses that line, the employer has to give non-key employees a minimum contribution or benefit and speed up the vesting schedule for employer contributions. The point is to keep tax-advantaged retirement dollars from flowing almost entirely to owners and senior officers.

How the 60% Test Works

The ratio is measured on the determination date, which is the last day of the preceding plan year. For a brand-new plan, it is the last day of the first plan year. Whatever the snapshot shows controls top-heavy status for the entire upcoming year.¹

You cannot just look at current balances. Distributions made to a participant during the five-year period ending on the determination date have to be added back to that participant’s account before running the ratio.¹ Hardship withdrawals, in-service distributions, and similar payouts all come back into the numbers, which prevents timing distributions to key employees right before the test to duck the threshold.²

Who Counts as a Key Employee

IRC 416(i) defines three categories, and satisfying any one is enough:

An officer earning more than $235,000 for the 2026 plan year. The statute caps the number of officers treated as key employees at the lesser of 50, or the greater of 3 or 10% of the workforce.³⁴
Any person who owns more than 5% of the business, regardless of compensation.⁵
Any person who owns more than 1% of the business and earns more than $150,000. That $150,000 figure is fixed in the statute and is not adjusted for inflation.²

These categories are narrower than the “highly compensated employee” group used for other nondiscrimination tests. Ownership and executive authority are what matter here.

Combining Multiple Plans

An employer that sponsors more than one retirement plan cannot run the test plan by plan. Every plan in which a key employee participates has to be included in a required aggregation group, along with any other plan needed to satisfy coverage or nondiscrimination under IRC 401(a)(4) or 410.⁴

The employer may also add other plans into a permissive aggregation group, provided the combined group still passes coverage and nondiscrimination. Adding a plan with many non-key employees can dilute the key-employee share below 60% and pull the group out of top-heavy status. A plan that would cause the group to fail nondiscrimination cannot be included.⁴

The Minimum Contribution for Defined Contribution Plans

Once a defined contribution plan is top-heavy, the employer must contribute at least 3% of annual compensation for every non-key employee who is a participant. That obligation applies even if the employee deferred nothing during the year.¹ Compensation for this purpose covers salary, bonuses, commissions, taxable fringe benefits, and elective deferrals, and it runs over the employee’s full-year pay rather than only pay earned while participating.²

One exception softens the 3% floor. If the highest contribution rate for any key employee is less than 3%, the employer can use that lower percentage for non-key employees too. A small-business owner who contributes 2% of pay to their own account only owes 2% to the non-key group.⁴

Employer matching contributions count toward the minimum.⁴ Employee salary deferrals do not. This is the most common trap. If a non-key employee defers 5% and the employer matches 2%, the match satisfies only 2% of the required 3%, leaving another 1% for the employer to make up.⁶

The Minimum Benefit for Defined Benefit Plans

Defined benefit plans use a different formula. Each non-key employee must accrue an annual retirement benefit of at least 2% of average compensation for every year of service while the plan was top-heavy, capped at 20%. In other words, the minimum stops growing after ten top-heavy years.⁴

Average compensation is drawn from the employee’s highest-earning consecutive years during the testing period. The result is expressed as an annual benefit payable at normal retirement age, not a lump sum. Where the plan’s regular formula already produces an accrued benefit above the minimum, no additional accrual is required.

Faster Vesting for Employer Contributions

Top-heavy plans must vest employer contributions on one of two accelerated schedules under IRC 416(b):⁴

Three-year cliff vesting: 0% for the first two years of service, then 100% on the third anniversary. An employee who leaves at two years and eleven months takes nothing from the employer’s side.
Six-year graded vesting: 20% after two years, 40% after three, 60% after four, 80% after five, and 100% after six.

These schedules govern only employer contributions. An employee’s own deferrals are always fully vested from day one, top-heavy or not.

Safe Harbor Plans Are Generally Exempt

A 401(k) plan that receives only elective deferrals and qualifying safe harbor contributions is not subject to top-heavy testing. Qualifying contributions include a 3% non-elective contribution to every eligible employee, a matching contribution of up to 4% of pay, or a qualified automatic enrollment match of up to 3.5%.²

Add anything beyond those safe harbor contributions and the exemption disappears. Layering a profit-sharing contribution onto a safe harbor match, for example, puts the plan back into the top-heavy regime. Growing businesses often overlook this when they start adding employer contributions to an existing safe harbor design.

SECURE 2.0 Adjustments

Section 310 of the SECURE 2.0 Act lets a 401(k) plan test employees who have not yet met the minimum age-and-service requirements under IRC 410(a) separately from the rest of the workforce for top-heavy purposes. The change applies for plan years beginning after December 31, 2023. Before then, including otherwise excludible employees could skew the ratio and trigger minimum contributions that the plan would not otherwise have owed.⁷

Section 125 shortened the long-term, part-time employee eligibility window from three consecutive 12-month periods to two, effective for plan years beginning after December 31, 2024. Plans that admit these long-term, part-time employees but do not give them safe harbor contributions remain exempt from top-heavy testing for those participants. Pre-2021 service is disregarded for vesting under this provision.⁷

Fixing a Missed Minimum Contribution

Failing to make required top-heavy contributions can put the plan’s tax-qualified status at risk. The IRS treats it as a plan document failure, and the correction is the same across all three programs: the employer contributes the missed minimum plus lost earnings through the date of correction.⁸

Three routes are available under the Employee Plans Compliance Resolution System:

Self-Correction Program (SCP), used when the employer finds the error on its own. Significant failures generally must be corrected within a three-year window; insignificant failures may be corrected later. No IRS filing or user fee is required.⁸
Voluntary Correction Program (VCP), used when the plan is not under examination. The employer submits a formal correction request with a user fee scaled to plan assets.⁸
Audit Closing Agreement Program, used when the IRS finds the failure during an audit. The employer and the IRS negotiate a closing agreement that includes corrective contributions and a monetary sanction.⁸

Catching the miss yourself costs only the contribution and earnings. Waiting for an audit adds a negotiated sanction on top of everything else.

1
Office of the Law Revision Counsel. 26 USC 416: Special Rules for Top-Heavy Plans
2
Internal Revenue Service. Is My 401(k) Top-Heavy?
3
Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living
4
Office of the Law Revision Counsel. 26 U.S. Code 416 – Special Rules for Top-Heavy Plans
5
Legal Information Institute. 26 USC 416(i)(1) – Definition: Key Employee
6
eCFR. 26 CFR 1.416-1 – Questions and Answers on Top-Heavy Plans
7
Internal Revenue Service. Employee Plans Issue Resource Guide – Top-Heavy Plans
8
Internal Revenue Service. 401(k) Plan Fix-It Guide – The Plan Was Top-Heavy and Required Minimum Contributions Were Not Made to the Plan