A 401(k) loan is not taxable when you take it. 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 applies at the time you borrow.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 you repay on schedule. If you miss payments or leave your job with a balance outstanding, the unpaid amount becomes taxable income, and if you’re under 59½ you’ll also owe a 10% early withdrawal penalty.
When a 401(k) Loan Turns Into Taxable Income
Two situations commonly convert a 401(k) loan into a tax bill: falling behind on payments while you’re still employed, and separating from your employer before the loan is paid off. The rules that govern each are different, and so is the paperwork that follows.
Missed Payments and the Cure Period
Missing a single payment does not instantly trigger taxes. Plans can offer a cure period that runs through the last day of the calendar quarter after the quarter in which the payment was due.2Internal Revenue Service. Issue Snapshot – Plan Loan Cure Period A payment missed in February, for instance, generally has to be caught up by June 30. Pay within that window and the loan stays in good standing.
Deemed Distributions
If the cure period expires and the loan is still behind, the outstanding balance becomes a “deemed distribution.” The unpaid amount is treated as taxable income for the year the failure occurs.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) The plan reports it to you on Form 1099-R the following January.
Here’s the part that catches people off guard. A deemed distribution does not actually remove the money from your plan. You still owe the loan balance, and the plan may keep charging interest on it.3Internal Revenue Service. Fixing Common Plan Mistakes – Plan Loan Failures and Deemed Distributions You end up paying income tax on money that is still technically tied up in your account.
What You’ll Actually Owe
The deemed distribution gets added to your ordinary income and taxed at whatever federal and state rates apply. If you’re under 59½ when the failure occurs, the 10% early withdrawal penalty applies on top of the income tax.4Internal Revenue Service. Topic No. 558 – Additional Tax on Early Distributions From Retirement Plans Other Than IRAs Both are reported and paid when you file your federal return for that year.
On a $30,000 deemed distribution for someone in the 22% federal bracket and under 59½, the combined federal tax and penalty alone would run about $9,600 before state taxes. And because the loan money is already spent, that bill has to come out of other funds.
Leaving Your Job With a Loan Balance
Quitting, getting laid off, or retiring with an outstanding 401(k) loan is the most common path to an unexpected tax bill. Most plan documents require full repayment shortly after your employment ends. If you can’t 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 outstanding loan amount, and the offset is reported as a taxable event.5Internal Revenue Service. Plan Loan Offsets If you’re under 59½, the 10% early withdrawal penalty applies to the offset too.6Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
The Tax Cuts and Jobs Act built in a longer window to fix this. If the offset happens because you left your job or because the plan terminated, you can roll the offset amount into an IRA or another employer plan by your tax filing due date, including extensions.5Internal Revenue Service. Plan Loan Offsets That typically gives you until mid-October of the following year if you file an extension, well beyond the old 60-day rollover deadline that applied before 2018.7Internal Revenue Service. Retirement Topics – Loans Complete the rollover inside that window and you avoid both the income tax and the 10% penalty.
The catch: you need the cash. The offset already reduced your plan balance, so to roll over, you have to deposit replacement money into an IRA out of your own pocket. For a large balance, that’s a real expense. It is almost always cheaper than paying the tax.
The Repayment Rules That Keep the Loan Tax-Free
Staying out of trouble means following the terms federal law requires every 401(k) loan to carry.
The loan has to be repaid within five years, with payments at least quarterly on a substantially level amortization schedule. In plain terms, roughly equal installments of principal and interest spread evenly across the loan.8Internal Revenue Service. Retirement Plans FAQs Regarding Loans Most plans handle this through payroll deduction, so you don’t have to track it yourself.
The one exception to the five-year clock is a loan used to buy your primary home, which can run longer. Federal law doesn’t set a specific maximum for home loans; that cap is left to the individual plan.9Office of the Law Revision Counsel. 26 U.S. Code 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts
Every loan also needs a written, legally enforceable agreement that spells out the amount, term, interest rate, and repayment schedule. Without that paperwork, the full amount transferred would be treated as a taxable distribution from day one.10eCFR. 26 CFR 1.72(p)-1 – Loans Treated as Distributions One more point before you borrow: your employer’s plan isn’t required to offer loans at all. Whether your 401(k) allows them is up to the plan sponsor.7Internal Revenue Service. Retirement Topics – Loans
What About “Double Taxation”?
A persistent worry about 401(k) loans is that repayments get taxed twice: once when you repay with after-tax dollars from your paycheck, and again when you pull the money out in retirement. The concern is understandable, and mostly overstated.
When you borrow, you receive money that has never been taxed. When you repay, you use after-tax income, which feels like a tax hit. You got the loan proceeds tax-free going out, though, so the repayment effectively offsets that break. On the principal, it’s a wash.
The portion that genuinely gets taxed twice is the interest. Interest payments go into your account as after-tax dollars, and that same interest will be taxed again when you withdraw it in retirement. On a typical loan of $20,000 at prime plus one over five years, total interest might run $2,000 to $3,000. The double tax on that slice is real, but it’s a small fraction of what the phrase “taxed twice” tends to suggest.