The IRS Just Made It Easier to Fix SEP, SIMPLE and 401(k) Plan Mistakes — What Owners Do Now

If your business offers a SEP, a SIMPLE IRA or a 401(k), there is a decent chance a small administrative slip is sitting in the file right now: a late deferral, an overpayment to a participant, an employee who should have been enrolled automatically and wasn't. On October 22, 2026, the Treasury Department and the IRS made fixing those slips easier. They issued Rev. Proc. 2026-34, an overhaul of the Employee Plans Compliance Resolution System (EPCRS), and it takes effect immediately.

The same day, the agencies also issued Rev. Proc. 2026-33, which creates a brand-new correction program for IRAs. That one starts May 1, 2027. Here is what each does, why it matters to an owner with a small team, and what to do this week.

What the IRS Announced on October 22

According to the IRS news release (IR-2026-126), Treasury and the IRS issued two revenue procedures. One updates the correction program for employer retirement plans. The other establishes a correction program for individual retirement accounts. IRS Chief Executive Officer Frank J. Bisignano said the procedures "simplify and speed up how errors with certain retirement plans and IRAs can get corrected."

• Rev. Proc. 2026-34 expands EPCRS for employer plans and is effective October 22, 2026. It replaces and restructures Rev. Proc. 2021-30, the guidance plan sponsors have used to correct plan errors.
• Rev. Proc. 2026-33 creates the IRA Compliance Resolution System (ICRS), modeled on EPCRS, with a May 1, 2027 start.

Which Plans Are Covered

The updated EPCRS covers qualified plans, 403(b) plans, SEP arrangements and SIMPLE IRA plans. For small employers, the SEP and SIMPLE IRA coverage is the headline, because those are the plans many owners set up through a bank or brokerage and then rarely revisit. Qualified plans, the category that generally includes a standard 401(k), are covered too.

EPCRS has long had three parts, and the new procedure keeps all of them: the Self-Correction Program, the Voluntary Correction Program and the Audit Closing Agreement Program. In plain terms, you can sometimes fix a mistake yourself without telling the IRS, you can sometimes apply to the IRS to approve your fix, and if the IRS finds the mistake first, you negotiate a resolution.

What Changed for Employer Plans

The IRS release describes the update at a high level. Law-firm analysis fills in some of the detail. Morgan Lewis, for example, reports that Rev. Proc. 2026-34:

• Incorporates changes from the SECURE 2.0 Act that are meant to expand self-correction.
• Makes permanent the safe harbor for correcting automatic enrollment and deferral failures.
• Gives plan sponsors more flexibility in dealing with overpayments.
• Includes several other changes aimed at making corrections "more practical and less costly."

The IRS page does not publish fees or detailed correction methods, and it does not break out rules plan by plan. Before you act on a specific error, read the revenue procedure itself or have your plan provider or a benefits attorney do so. That caveat matters: the headline is that correction got easier, but the exact fix for your exact mistake depends on the details.

Why This Matters If You Have Five or Fifty Employees

Small plans tend to break in ordinary ways. A payroll provider changes and deferrals are remitted late. A new hire is missed during enrollment. A distribution is paid out in the wrong amount. None of these means anyone acted in bad faith. They are the routine errors the correction system was built for.

The cost of not fixing them is that they compound. A missed deferral this year becomes a larger make-up obligation next year. The benefit of a friendlier correction program is that the cheaper path, correcting early and on your own terms, is now more clearly available.

The automatic enrollment safe harbor

If your plan has an automatic enrollment feature, the permanent safe harbor is the most practical piece of the update. Automatic enrollment failures, where an eligible employee was never enrolled or was enrolled at the wrong rate, are among the most common errors in plans with that feature. A permanent safe harbor means you no longer have to wonder whether the relief will be renewed before you get around to using it.

Overpayments

Paying a participant too much, whether through a loan, a distribution or a calculation mistake, is stressful because it can feel like money you have to claw back from an employee. Greater flexibility in handling overpayments gives sponsors more room to resolve the problem without turning it into a dispute.

The New IRA Program: Not Just for Big Plans

Rev. Proc. 2026-33 matters to owners for a different reason. It creates the IRA Compliance Resolution System, which lets IRA custodians and IRA owners request correction of certain eligible inadvertent failures caused by service-provider errors. It also adds a process to request a waiver of the 60-day rollover requirement.

Two practical points from the IRS release are worth noting. First, waiver requests are currently submitted as private letter ruling requests. During 2027 and 2028, those requests will move into ICRS. Second, the existing automatic waiver and self-certification procedures remain available at no cost under Rev. Procs. 2020-46, 2016-47 and 2003-16. If you rolled over money from a retirement account and missed the 60-day window because of a bank or custodian mistake, the free self-certification route is still there.

If you are a sole proprietor or run a one-person LLC who rolls an old 401(k) into an IRA, this is the program that may eventually help you if a custodian error causes a problem.

A Practical Checklist for This Week

1. Find your plan documents. Know which plan you have (SEP, SIMPLE IRA, 401(k)) and who administers it.
2. Ask your provider one question. "Have we had any operational errors in the past three years, and have they been corrected?" A good provider can answer quickly.
3. Audit deferral timing. Compare the dates employee contributions were withheld with the dates they were deposited.
4. Check enrollment. Match your eligible-employee list against plan participants, especially recent hires and anyone who changed from part-time to full-time.
5. Document any fix. Keep a short written record of what went wrong, when you found it and how you corrected it.
6. Get the revenue procedure in front of a professional. The new rules took effect on October 22, and the practical details are in Rev. Proc. 2026-34.

What We Don't Know Yet

The IRS announcement does not state correction fees, and it does not list comment deadlines in the news release itself. Treasury and the IRS are inviting public comments on both programs, and each revenue procedure identifies the issues where comments are especially requested. Owners and their advisors who want to weigh in should check the text of each procedure for the instructions and deadlines.

It is also too early to say how plan providers will change their own processes. Many small employers deal with a bank, brokerage or payroll platform rather than the IRS directly, so the practical effect will show up when those providers update their error-handling guidance.

Where Retirement Plans Fit in Your Bigger Picture

A retirement plan is one piece of how a small business takes care of its people and its own finances. If you are still deciding how to structure the business, our guides on LLC vs S corp and LLC formation explain how entity choice affects owner compensation and, in turn, what you can contribute. If you run a team with a mix of employees and contractors, it is worth reading independent contractor vs employee, since plan eligibility often turns on that classification. And if you are tracking the cost of benefits in your profit and loss statement, a corrected plan error is far cheaper than a growing one.

The Bottom Line

The IRS did not announce a deadline or a penalty this week. It announced a more forgiving way to fix mistakes that are common in small-employer plans. That is a rare piece of regulatory news that works in an owner's favor, and it only helps if you look. Spend an hour this week confirming that your plan has no open errors, and if it does, ask your provider how the updated EPCRS applies.

This article is general information, not tax or legal advice. Consult a qualified benefits professional about your plan.

Photo by Glenn Carstens-Peters on Unsplash