A 401(k) loan is not taxable at the time you borrow. The IRS treats the money as a debt you owe back to your own retirement account, so no income tax and no early withdrawal penalty apply when the funds hit your bank account.1Internal 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) That tax-free status holds only as long as the loan stays in good standing. Miss payments, or leave your job with a balance you cannot repay, and the picture changes fast.
What Keeps a 401(k) Loan Non-Taxable
Three conditions have to hold for the loan to stay outside your taxable income. The amount cannot exceed the lesser of $50,000 or half your vested balance, though a $10,000 floor applies even when half your balance falls below that.1Internal 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)2Office of the Law Revision Counsel. 26 U.S. Code 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts The loan has to be repaid within five years, with at least quarterly payments on a substantially level amortization schedule; a loan used to buy your primary home can run longer.3Internal Revenue Service. Retirement Plans FAQs Regarding Loans And there has to be a written, legally enforceable loan agreement specifying the amount, term, rate, and repayment schedule. Without that paperwork, the whole amount is treated as a taxable distribution from day one.4eCFR. 26 CFR 1.72(p)-1 – Loans Treated as Distributions
A loan that meets all three conditions is money you owe yourself. A loan that fails any of them can be taxed even though nothing about your day-to-day repayment felt different.
When Missed Payments Trigger a Tax Bill
A single missed payment does not put you on the hook right away. Plans can offer a cure period that runs to the last day of the calendar quarter after the quarter in which the payment was due.5Internal Revenue Service. Issue Snapshot – Plan Loan Cure Period Miss a payment due in February and you generally have until June 30 to catch up. Pay within that window and the loan stays clean.
Let the cure period lapse, and the outstanding balance becomes a “deemed distribution.” The unpaid amount is treated as taxable income for that year.1Internal 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) Here is the part that surprises people: a deemed distribution does not actually pull the money out of your plan. You still owe the loan balance, and the plan may keep charging interest on it.6Internal Revenue Service. Fixing Common Plan Mistakes – Plan Loan Failures and Deemed Distributions You pay income tax on money that is still, in a real sense, tied up in your account. The deemed distribution shows up on a Form 1099-R the following January.
The tax hit has two pieces. First, the deemed distribution is added to your ordinary income and taxed at your federal and state rates. Second, if you are under 59½ at the time, the 10% early withdrawal penalty applies on top of that.7Internal Revenue Service. Topic No. 558 – Additional Tax on Early Distributions From Retirement Plans Other Than IRAs Both are settled when you file your return for that year. On a $30,000 deemed distribution for someone in the 22% federal bracket who is under 59½, the federal tax and penalty alone come to roughly $9,600 before any state tax, and the money to pay it has to come from somewhere other than the loan proceeds.
Leaving Your Job With a Balance
The most common way a 401(k) loan turns into a tax bill is a job change. Quit, get laid off, or retire with a loan still open, and most plan documents require full repayment shortly after employment ends. If you cannot pay, the plan offsets the loan by reducing your account balance by the unpaid amount.
A plan loan offset is an actual distribution, not just a deemed one. Your account balance drops by the loan amount, and the offset is reported as taxable.8Internal Revenue Service. Plan Loan Offsets Under 59½, the 10% early withdrawal penalty applies as well.9Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
The Tax Cuts and Jobs Act built in a longer escape hatch for exactly this situation. If your loan offset happens because you left your job or the plan terminated, you can roll the offset amount into an IRA or a new employer’s plan by your tax filing due date, including extensions.8Internal Revenue Service. Plan Loan Offsets With an extension, that usually stretches to mid-October of the year after the offset, well beyond the old 60-day rollover window that applied before 2018.10Internal Revenue Service. Retirement Topics – Loans Complete the rollover in time and you owe no income tax and no penalty on the offset.
The practical hurdle is cash. The offset already reduced your plan balance, so rolling it over means depositing replacement money into an IRA out of pocket. For a large balance, that is a real expense, but it is almost always cheaper than absorbing the tax and penalty.
Is a 401(k) Loan Really Taxed Twice
You may have heard that 401(k) loan repayments get taxed twice: once when you repay from after-tax paychecks and again when you withdraw in retirement. It is a common concern, and mostly overstated.
The loan proceeds come out of the plan without being taxed. You repay with after-tax dollars, which feels like a tax on the repayment, but the tax-free proceeds on the front end offset that. On the principal, it is a wash.
The interest is the only piece that genuinely gets taxed twice. Interest goes back into the account as after-tax money and will be taxed again when you withdraw it in retirement. On a $20,000 loan at prime plus one over five years, total interest might run $2,000 to $3,000, so the doubly taxed amount is a small share of the loan, not the whole repayment.
The Short Version
Take a 401(k) loan that stays within the legal limits, has a proper written agreement, and gets repaid on schedule, and you owe nothing in tax on the transaction itself. The loan turns taxable in two situations: you miss payments and blow past the cure period, or you leave your job with a balance and neither repay nor roll over the offset by your tax deadline. In both cases the unpaid amount becomes ordinary income for the year, and if you are under 59½, the 10% early withdrawal penalty stacks on top. The rollover option for job-change offsets is the main way to unwind that outcome after the fact, so if you separate from an employer while owing a balance, that deadline is the one to circle.