Qualified Nonelective Contribution: Rules, Deadlines, and Tax Treatment

A qualified nonelective contribution, or QNEC, is an employer deposit into an employee’s 401(k) account that does not depend on whether the employee chose to defer any of their own pay. Employers use QNECs mainly to fix a failed nondiscrimination test or to make up for an eligible employee who was wrongly kept out of the plan. The money is fully vested the moment it lands in the participant’s account, and it is locked up under the same withdrawal restrictions that apply to salary deferrals.

How a QNEC Differs From a Match

A matching contribution rewards an employee who defers; a QNEC does not care. The employer puts the money in regardless. That is the “nonelective” piece.

A close cousin is the qualified matching contribution, or QMAC. Both share the same vesting and distribution rules, but they behave differently in testing. A QNEC is any qualifying employer contribution other than a match, while a QMAC is a matching contribution that meets the same strict standards. For the Actual Contribution Percentage (ACP) test, QMACs already counted toward the ADP test generally cannot also count toward the ACP test. QNECs carry no such restriction, which makes them the more flexible tool when a plan fails both tests.

When Employers Have to Make a QNEC

Two situations drive most QNECs.

Failed ADP or ACP Test

Traditional 401(k) plans must show each year that highly compensated employees (HCEs) are not saving at rates far above everyone else. Two tests enforce this:

The ADP test compares the average elective deferral rate of HCEs to the average rate of non-highly compensated employees (NHCEs).
The ACP test does the same comparison using employer matches and any after-tax employee contributions.

If the HCE average exceeds the NHCE average by more than the permitted spread, the plan fails. The employer can either distribute the excess back to HCEs as taxable income or deposit QNECs into NHCE accounts to raise the NHCE average and close the gap.¹

Timing matters. If excess contributions are not distributed or offset by QNECs within 2½ months after the plan year ends, the employer owes a 10% excise tax on the excess. Plans with an eligible automatic contribution arrangement get six months.² The employer pays the excise tax, not the participants. A QNEC made after that window can still eliminate the excess for qualification purposes, but the excise tax on the late-corrected amount still applies. Failure to correct within 12 months after the plan year end can cost the cash or deferred arrangement its qualified status entirely.¹

Missed Deferral Opportunity

When an eligible employee should have been enrolled but was not, the employer owes a corrective QNEC to make up for the lost chance to save. The size depends on how quickly the mistake is caught:

Corrected within three months: no corrective QNEC is required for the missed deferral, provided correct deferrals begin within the three-month window and the employee receives the required notice within 45 days of enrollment.
Corrected after three months but before the end of the third plan year following the year of the failure: the QNEC is 25% of the missed deferral. The missed deferral is figured by multiplying the ADP for the employee’s group (HCE or NHCE) by the employee’s compensation during the exclusion period. The employee must still be employed at the time of correction, and the notice requirements still apply.
Corrected outside those windows: the standard QNEC is 50% of the missed deferral.

In every case, the employer must also make a corrective matching contribution if the plan provides matching, and all amounts must be adjusted for lost investment earnings through the date of correction.³

Vesting and Withdrawal Rules

Two rules set QNECs apart from ordinary employer contributions like profit-sharing.

QNECs must be 100% vested when allocated to a participant’s account. The employee has an immediate, non-forfeitable right to the money regardless of tenure. Regulations finalized in July 2018 clarified that the vesting requirement applies at the time of allocation to the individual’s account, not at the time the money first enters the plan trust.⁴

QNECs are also subject to the same distribution restrictions as employee elective deferrals. The money stays in the plan until a qualifying event:⁵

Separation from service.
Death or disability.
Reaching age 59½.
Plan termination.

One point that catches people off guard: unlike elective deferrals, QNECs currently cannot be withdrawn on account of financial hardship. Not all money in a 401(k) follows the same hardship rules.⁵

Using Forfeitures to Fund a QNEC

When employees leave before fully vesting in employer contributions, the unvested portion is forfeited back to the plan. Since the 2018 regulatory change, forfeitures can be used to fund QNECs.

Before that change, the IRS required QNECs to be fully vested when first contributed to the plan, not just when allocated to individual accounts. Forfeited amounts had already been subject to a vesting schedule, so they were disqualified. Under Treasury Decision 9835, the vesting checkpoint shifted to the allocation date. An employer can now take money sitting in a forfeiture account, allocate it to NHCE accounts as QNECs, and satisfy the vesting requirement at the moment of allocation.⁴ For an employer facing a corrective QNEC obligation, the money may already be sitting inside the plan.

Deadlines

Fixing a Failed Test

A QNEC used to fix a failed ADP or ACP test must be deposited by the last day of the 12-month period following the close of the tested plan year. For a calendar-year plan that failed testing for 2025, that is December 31, 2026. Depositing within 2½ months of year end avoids the 10% excise tax, but the full 12 months preserves qualification.¹

Fixing an Excluded Employee

Corrective contributions for a missed deferral opportunity must be paid to the plan before the end of the third plan year after the year the failure began.³

Late Corrections

Missing a deadline does not automatically doom the plan, but it pushes the employer into the Employee Plans Compliance Resolution System (EPCRS):

The Self-Correction Program covers operational failures with no filing. Insignificant failures can be self-corrected at any time; significant failures have to be corrected within a specified window, judged on factors like the percentage of plan assets involved, the number of affected participants, and how promptly the employer acted.⁶
The Voluntary Correction Program requires a formal IRS submission with a user fee. For 2026, fees range from $2,000 for plans with up to $500,000 in assets to $4,000 for plans over $10 million.⁷
The Audit Closing Agreement Program applies when the IRS finds the failure on examination. It carries the highest cost and the least flexibility.

SECURE 2.0 Act Section 305 expanded self-correction. Eligible inadvertent failures, meaning mistakes that occurred despite reasonable compliance practices and procedures, can now be self-corrected with no fixed deadline as long as the correction is completed within a reasonable period after discovery. This expanded self-correction does not cover egregious failures or anything involving misuse of plan assets.⁸

Tax Treatment

QNECs are deductible business expenses for the employer, subject to the overall cap on employer contributions to defined contribution plans: the greater of 25% of total eligible compensation paid to participants or the amount required under a safe harbor arrangement.⁹ For most employers, that ceiling leaves plenty of room for corrective QNECs on top of regular contributions.

For the employee, a QNEC is not included in current-year taxable income. It grows tax-deferred inside the plan, and ordinary income tax applies only when distributions are eventually taken.

Making a QNEC is often cheaper in practice than the alternative. When a plan fails testing, the other route is refunding excess deferrals to HCEs, which becomes taxable income to the HCE in the year distributed. A QNEC shifts the cost to the employer but preserves everyone’s tax-deferred savings.

Annual Addition Limit

QNECs count toward the Section 415(c) annual addition limit that caps total contributions to a single participant’s defined contribution accounts. For 2026, the limit is $72,000.¹⁰ The annual addition includes the employee’s own deferrals (up to $24,500 for 2026), all employer contributions including QNECs, and any after-tax employee contributions. A corrective QNEC that pushes a higher-paid NHCE over the 415(c) limit creates a fresh compliance problem.

Safe Harbor Plans as an Alternative

Employers who want to stop worrying about reactive QNECs can adopt a safe harbor 401(k) design, which eliminates ADP and ACP testing by committing upfront to a minimum contribution for all eligible NHCEs. The most common approach is a nonelective contribution of at least 3% of each eligible employee’s compensation. It carries the same immediate vesting as a corrective QNEC but is planned from the start.

Employers who decide mid-year to switch to a safe harbor design must generally amend the plan at least 30 days before the end of the plan year. If the employer commits to a 4% nonelective contribution instead of 3%, the amendment can be adopted as late as the last day of the following plan year.¹¹ The tradeoff is a predictable guaranteed contribution instead of the risk that reactive QNECs cost more in a bad testing year.

1
Internal Revenue Service. 401(k) Plan Fix-It Guide – The Plan Failed the 401(k) ADP and ACP Nondiscrimination Tests
2
eCFR. 26 CFR 54.4979-1 – Excise Tax on Certain Excess Contributions and Excess Aggregate Contributions
3
Internal Revenue Service. 401(k) Plan Fix-It Guide – Eligible Employees Weren’t Given the Opportunity to Make an Elective Deferral Election (Excluding Eligible Employees)
4
Federal Register. Definitions of Qualified Matching Contributions and Qualified Nonelective Contributions
5
Internal Revenue Service. Issue Snapshot – Plan Forfeitures Used for Qualified Nonelective and Qualified Matching Contributions
6
Internal Revenue Service. Retirement Plan Errors Eligible for Self-Correction
7
Internal Revenue Service. Voluntary Correction Program (VCP) Fees
8
Internal Revenue Service. Notice 2023-43 – Guidance on Section 305 of the SECURE 2.0 Act
9
Office of the Law Revision Counsel. 26 USC 404 – Deduction for Contributions of an Employer
10
Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions
11
Internal Revenue Service. Mid-Year Changes to Safe Harbor Plans or Safe Harbor Notices