Rev. Proc. 2026-34: Tie Out Every Client's 401(k) Deferrals to Payroll Before You Lean on the Longer Self-Correction Window
Rev. Proc. 2026-34 took effect on October 22, 2026 and gives 401(k) sponsors a longer self-correction window for deferral mistakes. The cheaper fix still depends on finding the error early, so a CPA should tie every client's payroll deferrals to the plan recordkeeper, book any corrective contribution as employer expense, and record the date the failure was found.
Why this matters now
On 2026-10-22 the IRS issued IR-2026-126, Treasury, IRS update retirement plan correction program and establish correction program for individual retirement accounts. It says Revenue Procedure 2026-34 "expands the Employee Plans Compliance Resolution System and replaces and restructures the Revenue Procedure 2021-30 previously used by employee plan sponsors to make plan corrections," and that the revised procedures are effective October 22, 2026. The system keeps its three parts: the Self-Correction Program, the Voluntary Correction Program, and the Audit Closing Agreement Program. They cover qualified plans, 403(b) plans, SEP arrangements, and SIMPLE IRA plans, which is nearly every retirement plan a small-business client sponsors. The full text is posted as Rev. Proc. 2026-34. A companion procedure, Rev. Proc. 2026-33, creates an IRA Compliance Resolution System for IRA custodians and owners, effective May 1, 2027.
The substance arrived the same day in Ed Zollars's analysis at Current Federal Tax Developments, dated 2026-10-22. Self-correction is now timely when completed "by the later of the last day of the third plan year following the plan year in which the failure occurred or 18 months after identification." The old requirement for a favorable determination letter is gone. Plan document failures, employer eligibility failures, demographic failures, and plan loan failures, which were shut out of self-correction before, are now inside it. The automatic enrollment safe harbor that used to carry a sunset date is permanent under SECURE 2.0 section 350 and Code section 414(cc), reaches SEP and SIMPLE IRA plans, and applies to terminated employees. Under it, no qualified nonelective contribution is owed for missed deferrals if correct deferrals start by the end of the 9.5-month period after the plan year of the failure and the employee gets written notice within 45 days.
What the commentary doesn't cover is Monday morning in the firm. The 18-month clock runs from identification, so the date the error was found now matters as much as the error. The corrective contribution is employer money, not a catch-up of employee wages, and it needs its own account. And every reduced-cost tier rewards speed, which means the payroll-to-plan tie-out that finds the mistake is where the savings actually come from. That tie-out is the subject of this article.
What changed, and what it means for a client with 20 employees
Most small-plan failures are boring. A new hire's election is keyed at the wrong rate. A bonus is excluded from plan compensation when the document includes it. An employee who crossed the eligibility date never got the enrollment packet. A loan repayment stops when someone changes payroll providers. None of these are egregious, none involve diverted assets, and all of them are now the kind of eligible inadvertent failure the sponsor can fix on its own. The table maps the changes that matter for a firm that keeps the books and prepares the return for the sponsor.
| Topic | Rev. Proc. 2021-30 | Rev. Proc. 2026-34 | What the firm does |
|---|---|---|---|
| Self-correction deadline for significant failures | End of the third plan year after the failure year, with no extension | Later of the end of the third plan year after the failure year, or 18 months after the failure is identified | Record an identification date for every exception the tie-out finds |
| Favorable determination letter | Required to self-correct significant failures in qualified and 403(b) plans | Not required | One less document to chase; the plan document still has to be current |
| Failure types open to self-correction | Operational failures only; plan document, employer eligibility, demographic, and loan failures excluded | Those four categories now eligible when the failure is inadvertent | Widen the exception list beyond payroll: eligibility dates, loan repayments, late amendments |
| Automatic enrollment missed-deferral safe harbor | Temporary; 401(k) and 403(b) only | Permanent under Code section 414(cc); extends to SEP and SIMPLE IRA plans and terminated employees; deferrals must start by 9.5 months after plan year end with 45-day notice; no QNEC | Calendar the 9.5-month date for every auto-enroll client: October 15, 2027 for a 2026 calendar-year failure |
| Inadvertent benefit overpayments | Sponsor generally had to seek recoupment or restore the plan | Recoupment generally not required; exceptions for section 401(a)(17), 415, and 436 limits and for disqualified persons; $250 de minimis | Stop assuming a clawback entry is coming; read the exception list first |
| Group VCP submission threshold | 20 affected plans | 10 affected plans | A payroll-provider setup error across ten client plans can go in as one submission |
| Audit CAP sanction for late amendments | 150% to 250% of the VCP fee | 200% of the VCP fee | A flat price for missing an amendment deadline |
The missed-deferral tiers for plans without automatic enrollment are the rows most firms will actually use, and they are the rows to read carefully. Under the prior procedure, as the IRS 401(k) Plan Fix-It Guide still describes it, the sponsor owed a corrective contribution of 50% of the missed deferral, reduced to 25% when the employee was still employed, correct deferrals began within the correction window, and the employee got notice within 45 days, and reduced to nothing when correct deferrals began within three months. In every tier the sponsor also owed 100% of any missed match, plus earnings. The new procedure merged the old Appendix A and Appendix B into one Appendix. Confirm the client's tier against that Appendix before the entry is booked, because the Fix-It Guide page was last updated in November 2025 and cites the superseded procedure.
A worked example: one keyed-in election, three prices for the same mistake
Lakeside Veterinary Group has 22 employees and a 401(k) with a match of 100% of the first 4% deferred. A technician hired on April 6, 2026 became eligible on June 1 and submitted a 6% election on May 28. The payroll administrator keyed it as 0%. Pay is biweekly at $1,300 per period. From the June 5 pay date through October 9, ten pay dates went by with nothing withheld: $13,000 of plan compensation, $780 of missed deferrals, and $520 of missed match. The firm's October tie-out flagged the technician on October 16 as an eligible employee with an election on file and zero deferrals. Correct withholding starts with the October 23 payroll. The numbers are illustrative; the plan's earnings method and the technician's real compensation will move them.
The failure ran longer than three months, so the zero-contribution tier is out. It was caught inside the self-correction window with the technician still employed, so under the prior procedure's tiers the sponsor owes 25% of the missed deferral, or $195, plus the full $520 of missed match, plus earnings on both from the dates the money should have gone in. Call earnings $18 for the example. The employer's corrective contribution is $733. Had the plan used automatic enrollment, the permanent safe harbor would have removed the $195 entirely, provided deferrals restarted by October 15, 2027 and the 45-day notice went out; the $520 match and earnings would still be due. Had nobody looked until spring 2028, the technician's missed deferral would have been priced at 50%, or $390, on top of the match and two more years of earnings. Same keystroke, three prices, and the only variable is how soon someone compared the election file to the payroll register.
The entry
The $733 is employer money. The technician's own $780 was never withheld, and the sponsor does not go back and take it out of later paychecks; the technician simply starts deferring 6% from October 23 forward. So the entry at October 31 is a debit to retirement plan expense, corrective contributions, for $733 and a credit to accrued retirement plan contributions for $733. When the deposit clears, debit the liability and credit cash. Keep the corrective line separate from the regular match expense so the year-end Form 5500 preparer and the plan auditor, if there is one, can see it without a reconciliation. Do not run it through payroll as wages. A qualified nonelective contribution and a corrective match are employer contributions, not compensation, so there is no FICA on them and they do not belong in Box 1 of the W-2.
The expense is a flow item and belongs in October 2026, the month the correction was determined, not spread back across June through October. The liability is a point-in-time balance that sits on the October 31 balance sheet until the money reaches the plan. If the client reports on the cash basis for tax, the deduction follows the deposit, subject to the section 404 limits. If the client's 2026 financials are on the accrual basis, the accrued contribution is a current liability at year end if it is still unpaid.
Why the identification date is now a ledger fact
Under the old procedure the self-correction deadline was fixed by the failure year. Under the new one, the later of the two dates can be 18 months after identification, which means the sponsor needs a defensible record of when identification happened. Treat it the way you treat a discovery memo for a prior-period error: a dated note in the client file that says what was found, by whom, from which reports, and on what date, attached to the journal entry. That memo is also the first thing you will want if the plan is ever under examination, because the new procedure still closes self-correction once an exam begins unless the sponsor can show a specific commitment to correct that predates it.
Accounting controls for the payroll-to-plan tie-out
Source data: the payroll register by pay date showing employee deferrals and employer match per employee; the recordkeeper's contribution report or deposit confirmation for each pay date; the plan document's definitions of compensation, eligibility, and the match formula; the election file, whether paper forms or the recordkeeper's online election export; the census with hire dates, hours, and eligibility dates; and, for any exception, the dated identification memo. Pull the election file from the recordkeeper, not from payroll, because the whole point is to catch where the two disagree.
Calculation: for each pay date, employee deferrals plus employer match on the register must equal the deposit on the recordkeeper's report. For each employee, deferrals divided by plan compensation must equal the election percentage within rounding. Any eligible employee with an election on file and zero deferrals is an exception. Any eligible employee with no election on file is an exception until the enrollment packet and its date are located. For a confirmed failure, missed deferral equals election percentage times plan compensation over the exclusion period; missed match equals the plan formula applied to that deferral; the corrective contribution equals the tier percentage times the missed deferral plus 100% of the missed match plus earnings under the plan's method. The 25% and zero tiers also depend on dates: three months from the first missed pay date, 9.5 months after plan year end for automatic enrollment plans, and 45 days from the first corrected paycheck for the notice.
Review: a second person agrees the pay-date totals to the deposits, reads the exception list, confirms each exception has either a resolution or an identification memo with a date, agrees the corrective contribution to the deposit confirmation, confirms the 45-day notice was drafted, dated, and delivered, and checks that the corrective amount sits in its own expense account rather than inside regular match. For clients that run several entities on one payroll, the review also confirms each entity's deferrals landed in that entity's plan and ledger.
Decision: the plan sponsor decides to self-correct and signs the employee notice; the sponsor owns the plan, not the firm. The CPA decides whether the failure fits the Self-Correction Program or needs a Voluntary Correction Program filing, documents that analysis, and books the entry. The third-party administrator or recordkeeper computes earnings under the plan's method. ERISA counsel is brought in when a failure looks egregious, involves plan assets going somewhere they shouldn't, or surfaces after an examination letter arrives.
Limits and common mistakes
This is bookkeeping and workflow, not legal advice on plan qualification. The tier percentages above are the prior procedure's, and the new procedure consolidated them into a single Appendix with updated illustrations. Read the Appendix for the client's facts before booking a number, and expect the IRS to update the Fix-It Guide pages over the coming months.
Late deposits are a different problem. EPCRS addresses whether the plan stays qualified. Withholding deferrals from pay and then depositing them late is a Department of Labor matter under its Voluntary Fiduciary Correction Program, with lost earnings and a possible excise tax on Form 5330. The tie-out will surface late deposits too, because the register and the recordkeeper report will match in amount but not in date. Log them separately and don't fold them into the EPCRS file.
The compensation definition is where most small-plan failures hide. If the plan document includes bonuses and commissions in compensation and payroll was set up to exclude them from deferrals, every bonus run created a missed deferral for every participant. The tie-out catches that only if the calculation uses plan compensation from the document, not gross wages from payroll.
Terminated employees are now inside the automatic enrollment safe harbor, which removes an excuse but not the work. A technician who left in August still needs the missed match and earnings deposited to an account and still needs the notice. The group submission threshold falling to ten plans is useful for a firm whose payroll provider shipped the same bad default to a block of clients; it is not a reason to wait for ten before fixing one.
The earnings calculation is still open. The procedure asks for comments on a safe harbor that would use the section 6621(c)(1) underpayment rate through the DOL online calculator, or impose that rate as a floor. Until that is settled, use the plan's stated method and keep the calculation with the entry. And the IRA program under Rev. Proc. 2026-33 does not take effect until May 1, 2027, so an IRA custodian error found today still goes through the existing rollover waiver and private letter ruling routes.
Finally, the tie-out is only as good as the payroll data behind it. A client that switched payroll providers mid-year may have a clean register from October and a reconstructed one from April, and the election file may have moved with it. A client whose bookkeeping is partly automated needs the responsibility for the deferral tie-out assigned to a named person, because an automation that categorizes the 401(k) deposit correctly tells you nothing about whether the right employees were in it. And the same payroll register feeds the employer payroll tax budget you are building for 2027, so one tie-out can serve both.
Frequently Asked Questions
What is Rev. Proc. 2026-34?
Rev. Proc. 2026-34 is the IRS revenue procedure issued October 22, 2026 that restates the Employee Plans Compliance Resolution System, the program sponsors of 401(k), 403(b), SEP, and SIMPLE IRA plans use to fix compliance failures. It modifies and supersedes Rev. Proc. 2021-30 and is effective the day it was issued.
How long does a plan sponsor have to self-correct a failure under the new procedure?
Self-correction is timely if completed by the later of the last day of the third plan year following the plan year in which the failure occurred, or 18 months after the failure is identified. Because the second date depends on identification, sponsors should record the date each failure was discovered.
Who pays for a missed 401(k) deferral correction, the employer or the employee?
The employer. The corrective contribution for a missed deferral, any missed match, and earnings are employer contributions to the plan. The employee's missed deferrals are not withheld from later paychecks; the employee simply begins deferring at the correct rate going forward.
How should a corrective contribution be recorded in the books?
Debit a separate retirement plan expense account for corrective contributions and credit an accrued contribution liability in the month the correction is determined, then clear the liability when the deposit reaches the plan. Do not process it through payroll as wages, because it is an employer contribution and not compensation subject to FICA or W-2 reporting.
Does Rev. Proc. 2026-34 cover late deposits of employee deferrals?
No. The procedure addresses plan qualification failures. Depositing withheld deferrals late is handled under the Department of Labor's Voluntary Fiduciary Correction Program, with lost earnings and a possible excise tax reported on Form 5330, so late deposits found in a tie-out should be logged and corrected separately.
Once the tie-out runs every month, a missed election becomes a $195 line item found in October instead of a $390 surprise found by an examiner. FinBoard reads your clients' QuickBooks Online ledgers into one reporting view across every entity, so the retirement plan expense, the corrective contribution line, and the accrued liability behind them can be checked for all clients at once and drilled to the entries that created them. See how FinBoard supports multi-client review for accounting firms.
