What Happens If You Fall Behind on 401(k) Loan Payments?

A 401(k) loan is repaid through payroll deduction, so most people never think about it again after the paperwork is done. When payments stop, though, the consequences are more serious than a late fee. The unpaid balance can become taxable income, and unlike most tax problems, this one cannot be undone after the fact.

This article explains what happens, on what timeline, and what you can do at each stage.

Your loan has a repayment schedule with a fixed amount due each pay period. You are behind if a scheduled payment is not made in full and on time.

The most common causes are not what people expect:

• Your employer never started the deduction, or stopped it by mistake. Payroll errors are a frequent cause. See How Contributions and Loan Repayments Move from Your Paycheck to Your 401(k) Account.

• Unpaid leave. No paycheck means no deduction.

• Reduced hours, where your paycheck is too small to cover the full deduction.

• You left your job. Payroll deductions end with your employment.

Notice that three of those four are not a decision you made. Check your pay stub after taking a loan, and again any time your pay changes.

You do not default the moment a payment is missed. Your plan gives you a window to catch up, called the cure period.

Federal rules set the outer limit: the cure period cannot extend beyond the last day of the calendar quarter following the quarter in which the missed payment was due. Your plan may use a shorter window.

Example. A payment due in February is missed. If your plan uses the full period allowed, you have until June 30 to make it up. If it uses a shorter period, you have less.

To cure the missed payment, you must pay the overdue amount. Resuming normal payments going forward is not enough on its own.

If the missed payment is not made up by the end of the cure period, your loan defaults and the outstanding balance becomes a deemed distribution.

Here is what that means, including the part that surprises almost everyone:

You owe income tax on the unpaid principal plus accrued interest. The taxable amount is not just the principal you have left to repay. It is the entire outstanding loan balance as of the date of the deemed distribution, which includes interest that accrued and went unpaid up to that point. If you missed payments for several months, the interest that built up during those months is part of the taxable amount.

You may owe a 10% early withdrawal penalty on top of income tax if you are under age 59½ and no exception applies.

You will receive a Form 1099-R for that tax year. A deemed distribution is reported with distribution code L in Box 7a, combined with code 1 if you are under age 59½, or code B if the loan came from your Roth account. On Forms 1099-R for tax years before 2026, this appears as Box 7 rather than Box 7a.

The amount cannot be rolled over. Unlike most distributions, there is no way to move a deemed distribution into an IRA to avoid the tax.

You still owe the loan. This is the part that catches people. A deemed distribution is a tax event, not a forgiveness of debt. The loan remains on the books, continues to accrue interest, and must still be repaid. Until it is, it continues to count against how much you can borrow in the future and it reduces the amount available to you at distribution.

Interest that accrues after the deemed distribution is not taxed again and does not appear on a second Form 1099-R, but it does increase the amount you still owe.

No credit reporting. A defaulted 401(k) loan is not reported to credit bureaus and does not affect your credit score. The damage is tax and retirement savings, not credit.

If you do make payments after a deemed distribution, those payments create after-tax basis in your account, which means you are not taxed twice on the same money later. Keep your records.

This is a different situation with a different, and better, outcome.

When you separate from employment with a loan outstanding, your plan will typically offset the unpaid balance, meaning your account balance is reduced by the amount you owe and the loan is closed. As with a deemed distribution, the amount is the unpaid principal plus accrued interest through the offset date.

A loan offset is treated as an actual distribution rather than a deemed distribution, and that difference matters:

A qualified plan loan offset gives you the longest window. Not every offset qualifies. The term has a specific definition, and whether yours meets it determines whether you have 60 days or several months to act.

An offset is a qualified plan loan offset only if both of the following are true.

1. The offset happened because of one of two specific events. Either the plan terminated, or you failed to meet the loan's repayment terms because you severed from employment. An offset triggered by anything else does not qualify. For example, if you reached age 59½ and took an in-service distribution that offset your loan, that is an ordinary offset, not a qualified one, because it was not caused by severance or plan termination.

2. The loan was in good standing immediately before that event. If you had already stopped making payments and blown through the cure period before you left, the loan was already in default and already a deemed distribution. It cannot become a qualified offset afterward.

For offsets caused by severance from employment, there is also a 12-month deadline. The offset must occur within the period beginning on the date you severed from employment and ending on the first anniversary of that date. If the plan does not offset the loan until 14 months after you left, it is an ordinary offset and you get 60 days, not the extended window.

One clarification on what counts as severance: you have severed from employment when you cease to be an employee of the employer maintaining the plan. If your employer is acquired and the new employer continues to maintain the same plan for you, you have not severed from employment, and the loan continues under its normal terms.

The whole point of the extended window is that you do not have the money. You spent the loan proceeds, which is why you borrowed in the first place. The rollover does not have to come from the plan or from the offset itself. You can use savings, a bonus, or any other source. What you need is time to gather it.

Example. Two people each leave a job in March with a $20,000 loan outstanding and a 401(k) balance that gets reduced by $20,000 to close the loan.

• Person A was current on payments. The offset is a qualified plan loan offset. They have until April 15 of the following year, or October 15 with an extension, to come up with $20,000 and roll it into an IRA. They do, and owe no tax on it.

• Person B stopped making payments the previous August and the loan defaulted in December. That was a deemed distribution, taxable in the prior year. No rollover is available at any point, and they still owe the loan balance.

Same job, same loan amount, materially different outcome, driven entirely by whether payments were current.

The practical takeaway: if you leave your job with a loan outstanding, do not let it go into default first. A loan in good standing at separation gives you a rollover window. A loan already in default does not.

If you see code M in Box 7a of your Form 1099-R, that is the plan telling you and the IRS that the extended rollover window applies. If you believe your offset should have been coded M and it was not, call us before you file.

Your options at separation are usually to repay the balance in full before the offset occurs, or to allow the offset and then roll over an equivalent amount within the window. See What Happens to My 401(k) If I Leave My Job?.

Unpaid leave of absence. Your plan may permit repayments to be suspended for a limited period, generally up to 12 months, with the loan re-amortized when you return. The loan still has to be repaid within its original maximum term, so payments after you return will be higher.

Military leave. Repayments may be suspended for the period of your military service, and the loan term may be extended accordingly. Different rules apply here than for other leave.

In both cases, contact us before the leave begins. A suspension has to be set up. If payments simply stop and nothing is arranged, the loan follows the normal default path.

1. Check your pay stub to confirm whether the deduction is actually being taken.

2. If the deduction is missing, contact your employer's payroll department first. If it is a payroll error, they can correct it and catch up the missed amount.

3. Call us at 866-202-4646 to find out exactly how much is overdue and how long you have. Do not guess at either number.

4. Make the overdue payment before the cure period ends. See How to Pay Off Your 401(k) Loan for how to submit a payment.

5. If you cannot catch up, consider whether paying the loan off in full is possible, or plan for the tax consequence so it does not arrive as a surprise at filing time.

The one thing not to do is wait. Once the cure period ends, the default cannot be reversed.

We can tell you your exact overdue amount, your cure period deadline, your outstanding balance, and how to submit a payment. Call us.

We cannot extend the cure period beyond what federal rules and your plan document allow, waive a default after the fact, or reverse a deemed distribution or a 1099-R that has been correctly issued. Those limits are set by law, not by us.

We do not provide tax advice. If your loan has defaulted, talk to a tax professional about your options for the year.

• Can I Take a Loan, and How Much? Eligibility and Limits

• How to Pay Off Your 401(k) Loan

• What Happens to My 401(k) If I Leave My Job?

• Special Tax Notice

Call 866-202-4646 or email info@nesteggs401k.com.