The Internal Revenue Service (IRS) has released updated guidance detailing how employers must handle missed 401(k) contributions and payroll processing mistakes. Published as Revenue Procedure 2026-34 on October 22, 2026, the new rules supersede previous standards under Rev. Proc. 2021-30 and formally incorporate provisions from the SECURE 2.0 Act of 2022. The guidance impacts millions of workers whose elective retirement deferrals or matching contributions were omitted or incorrectly processed by payroll.
What the new IRS rules change for employers
Under the updated guidance, employers have revised standards for correcting plan administration errors through the IRS Self-Correction Program. When an employer fails to process an employee's requested payroll deferral, the default fix typically requires the company to make a qualified nonelective contribution (QNEC) into the employee's account.
Key updates in Rev. Proc. 2026-34 include:
Standard corrections: For conventional plan errors, employers traditionally deposit a QNEC equal to 50% of the missed deferral amount, along with 100% of any missed employer match and investment earnings.
Three-month grace period: Any deferral failure corrected within three months requires no QNEC for the missed deferral, though matching funds and earnings must still be restored.
Reduced 25% penalty rate: Failures fixed after three months but within three plan years following the year the error began now qualify for a 25% QNEC rate instead of the full 50%.
Expanded self-correction: The rule expands the ability to self-correct "Eligible Inadvertent Failures" without formal IRS filings, provided the fix occurs by the end of the third plan year after the failure or within 18 months of identification.
How safe harbor rules affect missed deferrals
The IRS framework also codifies Section 350 of the SECURE 2.0 Act, establishing a special safe harbor for automatic enrollment and automatic escalation plans. Under this provision, employers can correct missed deferrals with zero QNEC payment for the missed employee contributions if specific deadlines are met.
To qualify for the zero-QNEC safe harbor, the payroll error must be corrected no later than nine and a half months after the end of the plan year in which it occurred. Employers must also send a formal notice to the affected employee within 45 days after correct payroll deferrals begin, and any missed employer match must be deposited by the last day of the twelfth month following the restart of deferrals. Furthermore, if the plan's default investment lost money during the failure period, those market losses cannot be used to reduce the employer's required match correction.
Why it matters for retirement savers
A single payroll oversight can quietly deprive workers of substantial compound growth over time. While corrective employer deposits help make up for lost time in the market, the IRS mandates that employer QNECs must be pre-tax funds. They cannot be classified as designated Roth contributions, even if the worker originally intended to make Roth deferrals.
Additionally, because QNECs only replace a portion of missed deferrals—or zero percent under automatic enrollment safe harbor rules—workers themselves remain responsible for replacing their own lost savings out of pocket. Employees who receive a correction notice are permitted to temporarily increase their future contribution rates to make up the difference, provided they stay within annual contribution ceilings set by tax law.
Ensuring your retirement accounts remain on track is critical for long-term financial security, especially for workers managing balances and evaluating whether retirees face a risk of outliving their savings.
What workers should check on their pay stubs
Plan sponsors bear the legal obligation to rectify payroll errors, but workers are often the first to spot missing contributions. IRS rules specify that employer correction notices must explain the error but do not necessarily have to state exact dollar figures missed.
Financial experts recommend that workers regularly audit their retirement accounts by taking the following steps:
Compare quarterly 401(k) account statements directly against year-to-date payroll stubs to verify that elected contribution percentages match actual deductions.
Confirm that employer matching dollars are being deposited according to the plan's vesting and match schedules.
Review any formal correction notices from employers carefully, calculating the specific dollar shortfall to decide whether to adjust personal contribution rates for the rest of the year.
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