What Happens If You Default on a 401(k) Loan?

If you default on a 401(k) loan, the unpaid balance is treated as a distribution. You owe ordinary income tax on it, plus a 10% early-withdrawal penalty if you’re under 59½. You first get a cure period, which runs through the end of the calendar quarter after the quarter of the missed payment. A default never appears on your credit report.

By the About401K editorial team · Facts verified against IRC §72(p) and Treas. Reg. §1.72(p)-1 · Updated September 24, 2026

If you have missed a payment or just got a notice from your plan, take a breath first. Nobody is coming after you. There is no collection agency, no lawsuit, and nothing that touches your credit. What a 401(k) loan default actually costs you is a tax bill, and depending on which kind of default you have, you may still have months to fix it entirely. This page explains which situation you are in and what to do about it.

Deemed distribution vs. plan loan offset: the distinction that decides your options

Two different events both get called “default,” and they lead to very different outcomes. Figuring out which one you have is the first thing to do, because one of them is fixable and the other is not.

• Deemed distribution. This happens when you stop paying while still employed, or otherwise break the terms §72(p) requires, and the cure period runs out. The IRS treats the balance as distributed for tax purposes only. You are taxed on it, but the loan still exists on the plan’s books and your account is not actually reduced until a real distribution event occurs. A deemed distribution cannot be rolled over, and there is no way to undo it.
• Plan loan offset. This is a real distribution. The plan reduces your account balance by the unpaid loan, most commonly when you leave your job and the loan is not repaid. An offset is taxable too, but because it is an actual distribution, it can be rolled over. That rollover is your escape hatch, and the next section explains how it works.

So the tax bill looks the same up front, but only one of them is reversible. If you are falling behind while still employed, making up the missed payment before the deadline is worth real effort, because after that point there is no fix available at any price.

What happens to the loan when you leave your job?

When you leave, payroll deduction stops. Unless your plan lets former employees keep paying directly, or you pay the balance off outright, the plan offsets the loan against your account.

Older articles will tell you that you then have 60 or 90 days to act. That rule is obsolete. Since the 2018 tax law (the Tax Cuts and Jobs Act), a qualified plan loan offset can be rolled over until your tax-filing deadline for the year of the offset, including extensions (IRC §402(c)(3)(C)).

In plain terms, that often gives you the better part of a year instead of three months. Deposit the offset amount into an IRA or your new employer’s plan by that deadline and you owe no tax and no penalty on it. The money has to come from outside sources, because the plan already applied your account balance to the loan.

The tax cost of default

The defaulted balance is taxed as ordinary income in the year of the default. If you are under 59½, the 10% early-withdrawal penalty stacks on top of that unless a separate exception applies (IRC §72(t)).

The cure period for missed payments

The regulations let a plan give you a cure period that runs to the end of the calendar quarter following the quarter in which you missed the payment (Treas. Reg. §1.72(p)-1, Q&A-10). Most plans adopt the full period, though yours is not required to, so confirm it rather than assuming.

Here is what that looks like in practice. Miss a payment on February 10, which falls in the first quarter, and the plan can give you until June 30 to make it up. Miss one on November 5, in the fourth quarter, and you can have until March 31 of the following year.

Making up the missed payments inside that window fully cures the loan, and no tax event happens at all. It is genuinely as if nothing went wrong. If your payments stopped because of an unpaid leave rather than a cash shortage, a 12-month suspension may protect you instead, so talk to your administrator before the cure period becomes the issue.

What to do if you just defaulted

1. Call the plan and ask which kind of default this is. Use the exact words “deemed distribution” and “plan loan offset.” The answer determines everything that follows, and the participant service line can tell you in a few minutes.
2. Ask whether your cure period is still open. If a payment was missed recently, you may still be inside the window that runs to the end of the following calendar quarter. Ask for the exact date and what dollar amount would cure it.
3. If the cure window is open, make up the missed payments. This is the only outcome where the default disappears completely, so it is worth borrowing from almost anywhere else to do it.
4. If it is an offset because you left the job, write down your rollover deadline. That is your tax-filing deadline for the year of the offset, including extensions. Filing an extension buys you real additional months here.
5. Line up the cash for that rollover. Any amount you deposit by the deadline escapes tax and penalty, and partial deposits help proportionally. You do not have to replace the whole balance to benefit.
6. Set aside money for the tax bill on whatever is left. Use the calculator above. This is the part that catches people, because no cash arrived with the distribution but the tax is still due.
7. Keep the Form 1099-R. Store it with your permanent tax records, not just this year’s folder. If the default was a deemed distribution, that form documents the basis you are entitled to later.
8. Keep contributing to the plan. A default does not take away your right to defer, and stopping contributions only compounds the damage.

Does a 401(k) loan default hurt your credit?

No. A 401(k) loan is never reported to the credit bureaus, not when you take it, not while you repay it, and not when you default. There is no lender to report you, because the money you borrowed was your own.

The consequences of a default are entirely tax consequences. You owe the income tax, possibly the 10% penalty, and you permanently lose that balance and its future growth from your retirement account. Your credit score does not move at all.

Contributions after a default

A default does not suspend your right to defer, and no rule requires the plan to bar you from contributing. You can keep putting money in up to the 2026 limit of $24,500 exactly as before.

What a default often does affect is future borrowing. After a deemed distribution, plans commonly refuse to issue new loans, or require additional security, until the defaulted loan is resolved. On top of that, a deemed but unpaid balance still counts against your $50,000 and 50% limit, so it reduces what you could borrow even if the plan were willing.

Loan basis after a deemed distribution

Here is a quirk that works in your favor, and almost nobody knows about it. When a loan is deemed distributed, you pay tax on money that never actually left the plan’s books.

To prevent the IRS from taxing that same money twice, the amount you were taxed on becomes tax basis in your account (Treas. Reg. §1.72(p)-1, Q&A-21). If you later repay the deemed loan, those repayments are treated as after-tax amounts, and when the account is eventually distributed, your basis comes out tax-free.

The paperwork is what makes this real. Keep the Form 1099-R from the default year somewhere permanent, so the basis is documented years from now when you or the plan compute the tax on your final distribution. Nobody will reconstruct it for you.

Avoiding default

If you are reading this before the fact, or before taking your next loan, a few practical habits keep the loan on track.

• Before borrowing, ask yourself honestly whether you would still be at this employer when the loan finishes, and how you would pay the balance off if you left. The loan term you choose sets how many years that risk runs.
• If money gets tight, use the cure period deliberately rather than drifting past it. It is a real deadline, and it does not renew.
• If you are leaving your job, line up the payoff or the offset rollover before your last day. The tax-filing deadline gives you months, but only if you know the rule exists.
• If you are going on leave, get the suspension coded with the plan before payments start failing, not after.

Related reading

• 401(k) loan rules: the 2026 limits and how to borrow
• How to pay back a 401(k) loan and pay it off early
• Suspending loan payments during a leave of absence

Sources: IRC §72(p) · Treas. Reg. §1.72(p)-1 · IRC §402(c)(3)(C) · IRS: plan loan FAQs