To pay back a 401(k) loan, you make level payments of principal and interest on a schedule set by your plan, usually through automatic payroll deductions, at least once a quarter, until the balance is repaid within five years.1Internal Revenue Service. Retirement Topics – Loans Home-purchase loans can run longer, and the rules shift when you take leave, miss a payment, or leave your job. Everything below explains how those pieces fit together.
Payroll Deduction Is the Default
If you are still working for the employer that sponsors the plan, repayment almost always happens through automatic payroll deduction. Your plan administrator coordinates with payroll to withhold a fixed dollar amount from each paycheck, and federal law requires those payments to stay level throughout the life of the loan, with each one covering a portion of both principal and interest.2Office of the Law Revision Counsel. 26 U.S. Code 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts Payments must happen at least quarterly, though most plans deduct every pay period so each installment is smaller.
The money comes out of your after-tax pay. Loan repayments do not reduce your taxable income the way regular 401(k) contributions do.3Internal Revenue Service. Considering a Loan From Your 401(k) Plan The payment amount depends on how much you borrowed, your plan’s interest rate (often one or two points above prime), and the term. Interest you pay flows back into your own account rather than to an outside lender.
Confirm with your HR or benefits contact when the first deduction will hit and how it will appear on your pay stub. Catching a missed setup early matters, because falling behind on the schedule can turn the loan into a taxable event.
Making Manual or Extra Payments
Payments outside the payroll cycle come up in a few situations: a leave of absence, an early payoff, or a gap before payroll deductions begin. Contact your plan administrator for instructions. You’ll typically need your loan account number and the plan’s identification number so the payment posts correctly.
Many administrators offer an online portal for ACH transfers from your bank account. That’s usually the fastest option and creates an immediate electronic record. Certified checks or cashier’s checks mailed to a designated address are often accepted; personal checks frequently are not, because of the risk of insufficient funds.
Level amortization is required by law, so each scheduled installment has to stay the same size.2Office of the Law Revision Counsel. 26 U.S. Code 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts Many plans still allow extra lump-sum payments on top of that schedule, which reduce principal and shorten the payoff. If you’ve fallen behind, the IRS recognizes corrections including a lump sum to cover missed installments with interest, or reamortizing the remaining balance into higher future payments.4Internal Revenue Service. 401(k) Plan Fix-It Guide – Participant Loans Don’t Conform to the Requirements of the Plan Document and IRC Section 72(p)
How Long You Have to Repay
General-purpose 401(k) loans must be fully repaid within five years.2Office of the Law Revision Counsel. 26 U.S. Code 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts Your plan document sets the exact amortization schedule based on that ceiling. If the loan was used to buy your primary residence, the five-year limit doesn’t apply, and plans commonly allow 15, 20, or even 30 years for repayment.1Internal Revenue Service. Retirement Topics – Loans
Blowing past the maximum term turns the remaining balance into a taxable distribution. Under age 59½, a 10% early withdrawal penalty applies on top of ordinary income tax.5Internal Revenue Service. Topic No. 558, Additional Tax on Early Distributions From Retirement Plans Other Than IRAs
Pausing Payments During Leave or Military Service
An unpaid leave of absence can let you suspend payments for up to a year, if your plan allows it. When you come back, you make up the missed amounts by raising each remaining payment or paying a lump sum, so the loan still gets fully repaid within the original five-year term.6Internal Revenue Service. Retirement Plans FAQs Regarding Loans The level-amortization rule is paused during the leave, not waived.
Qualified military service is broader. If you’re called to active duty, your plan can suspend payments for the entire length of your service, and the loan term is extended by that same period once you return.2Office of the Law Revision Counsel. 26 U.S. Code 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts Interest may keep accruing, but the missed payments will not trigger a taxable deemed distribution while you’re deployed.
Both suspensions depend on your specific plan document. Not every plan adopts them, so confirm with your administrator before you stop paying.
What Happens When You Miss a Payment
Missing a payment doesn’t immediately create a tax bill. Many plans include a cure period that gives you time to catch up. The longest cure period the IRS allows runs through the last day of the calendar quarter following the quarter you missed.7Internal Revenue Service. Issue Snapshot – Plan Loan Cure Period Miss a May payment, for example, and you have until September 30 to make it up.
If the payment is still open after the cure period ends, the IRS treats the entire unpaid loan balance, plus accrued interest, as a deemed distribution.8Internal Revenue Service. Fixing Common Plan Mistakes – Plan Loan Failures and Deemed Distributions The distribution is taxed as ordinary income, and the 10% early withdrawal penalty applies if you’re under 59½.9Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
Two features of a deemed distribution catch people off guard. You still owe the loan to the plan; the tax hit doesn’t cancel the balance. You can keep making late payments, and those payments build tax basis in the account. But a deemed distribution can’t be rolled over into an IRA or another plan, so there’s no way to undo the tax after the fact.6Internal Revenue Service. Retirement Plans FAQs Regarding Loans Your administrator reports it on Form 1099-R using distribution code L.10Internal Revenue Service. Instructions for Forms 1099-R and 5498
Repaying After You Leave Your Job
Leaving your employer, whether you quit, are laid off, or retire, generally accelerates the loan. Most plans require full repayment within a short window. If you can’t pay, the administrator subtracts the unpaid balance from your account. That reduction is a plan loan offset, and unlike a deemed distribution, it counts as an actual distribution that can be rolled over.6Internal Revenue Service. Retirement Plans FAQs Regarding Loans
Without a rollover, the offset is taxed as ordinary income, plus the 10% penalty if you’re under 59½.5Internal Revenue Service. Topic No. 558, Additional Tax on Early Distributions From Retirement Plans Other Than IRAs To avoid the tax, deposit an equivalent amount of cash into an IRA or a new employer’s plan. That deposit counts as a rollover and neutralizes the tax.
Rollover Deadline for Qualified Plan Loan Offsets
The rollover deadline depends on how the offset is classified. A qualified plan loan offset (QPLO), which generally means the offset happened because you left your job or the plan was terminated, gets rolled over by your federal tax filing deadline for the year of the offset, including extensions.11Internal Revenue Service. Plan Loan Offsets Change jobs in July 2026, and you generally have until April 15, 2027, or October 15, 2027 with an extension. Non-QPLO offsets fall under the standard 60-day rollover window instead.
Reporting the Offset on Your Tax Return
Your former plan administrator sends a Form 1099-R showing the offset amount. A QPLO uses distribution code M in box 7.11Internal Revenue Service. Plan Loan Offsets On your federal return, you report the distribution and indicate the rollover so the IRS sees that the loan was satisfied with replacement funds. Keep documentation from both the old plan (showing the offset) and the new account (showing the deposit). Missing the rollover deadline makes the offset a permanent taxable distribution at your ordinary income tax rate.
How Interest and Taxes Work on Your Repayments
Because you repay with after-tax dollars, the tax treatment is worth understanding. The principal you borrowed came out of your account tax-free; it wasn’t treated as a distribution. Repaying it with after-tax money restores funds that will be taxed later when you withdraw them in retirement. So the principal is not actually taxed twice, since it was never taxed on the way out.
Interest works differently. You pay interest with after-tax dollars, and that interest lands in your 401(k), where it will be taxed as ordinary income again at withdrawal. Interest on a 401(k) loan is the piece of the transaction that genuinely gets taxed twice. And unlike interest on some other kinds of debt, 401(k) loan interest is not tax-deductible.