401(k) Loans: Rules, Costs and Risks

1. Introduction

Quick Answer: Most guides judge a 401k loan on its rate, then warn vaguely about lost growth. Both miss the real number: your unpaid balance on the day you stop working there. DollarVisor prices that risk year by year, and no plan provider paid to appear.

Borrowing from your own retirement account feels like the one loan with no catch. No credit check, no lender, and the interest goes back to you.

The catch is not the rate. This loan is tied to your job, and the tax bill for breaking it lands in a year you are already short on income. That should move a 401k loan up or down your list far more than the APR.

The explainer below covers the mechanics.

2. What Is a 401(k) Loan, Exactly?

Quick Answer: A 401k loan lets you borrow from your vested balance and repay it through payroll deduction, with interest credited to your account. It is not a withdrawal and not taxed when taken. Your employer’s plan decides whether loans exist at all: see how a 401(k) works.

Your money moves out of the investments into a loan ledger inside the same account. Repayments leave your paycheck automatically and land back in your balance.

Three features set it apart:

• No credit check, no credit report entry. It never touches your file or your score.
• You are the lender. The interest is not a bank’s profit; it lands back in your account.
• Your employer sets the terms. Plans need not offer loans at all, and those that do set their own fees, minimums and exit rules.

At year-end 2022, 84% of participants were in plans allowing loans, but only 15% of those eligible had one outstanding, and loans averaged 10% of the remaining balance, per EBRI’s 401(k) database.

3. How Much Can You Borrow? The IRS Limits

Quick Answer: The ceiling is the lesser of $50,000 or the greater of $10,000 and 50% of your vested balance. A $40,000 balance supports $20,000; a $200,000 balance still caps at $50,000. Anything larger belongs in the wider borrowing comparison, not here.

Those figures come from the IRS retirement plan loan FAQs. Two details catch people out. First, the $10,000 floor is optional: a plan may let a $12,000 balance support a $10,000 loan rather than $6,000, but it need not.

Second, the cap covers all your loans from that plan combined. A second loan is allowed, but old and new balances together must stay under the limit.

Vested is the operative word. Match you have not earned yet does not count, so your vesting schedule can quietly halve what you can take.

4. What Does a 401(k) Loan Cost?

Quick Answer: Most plans set the rate at prime plus one point. With prime at 6.75%, that is about 7.75%: well under a bank personal loan and far under the card balances most people attack. Add a setup fee near $50 to $100.

The rate is set by your plan, not by law. Federal rules ask for a reasonable rate comparable to a commercial lender’s, and prime plus one or two points is how nearly every recordkeeper reads that. Prime sat at 6.75% through July 2026, per the Federal Reserve bank prime loan rate series.

One point most explainers soften: the interest is not free money coming back to you. You repay with dollars that already faced payroll and income tax, and they are taxed again on withdrawal. On the interest portion that is genuine double taxation: a few hundred dollars over five years on a $12,000 loan. Real, but far smaller than the job-loss risk below.

5. How the Rate Compares to Everything Else

Quick Answer: On rate alone, a 401k loan wins comfortably: roughly four points under a bank personal loan, about fourteen under a card carrying a balance. If your debt is a card balance, that gap is the whole argument, but check current personal loan rates first.

The card figure is the rate on accounts actually assessed interest: the honest comparison, since it excludes cards paid in full monthly. The personal loan average covers 24-month bank loans.

6. The Repayment Rules That Trip People Up

Quick Answer: Five years is the maximum term, payments must be substantially level and made at least quarterly, and only a loan used to buy your main home can run longer. That fixed clock makes the monthly payment bigger than a stretched-out payoff plan would be.

Four IRS conditions apply, and plans enforce them because breaking one turns the loan into a taxable distribution:

1. Five years, no extensions. The only exception is a loan used to buy a primary residence, which plans may run longer.
2. Substantially level payments. You cannot pay interest only for four years and balloon the principal at the end.
3. At least quarterly. Payroll deduction handles this automatically for most people.
4. A cure period if you miss one. Plans may give you until the end of the next quarter to catch up before the balance is deemed distributed.

The practical effect is a payment larger than borrowers expect. A $12,000 loan at 7.75% over five years costs $241.87 a month, out of the same paycheck funding your contributions. Many people quietly cut those to make room, and that is where the real damage happens.

7. What Happens If You Leave Your Job

Quick Answer: Your plan may demand the full balance back when you leave. If you cannot pay, it is offset and treated as a distribution: taxable, plus 10% if you are under 59½. It is the largest risk in what happens to a 401(k) when you quit.

The IRS puts it plainly: unpaid amounts become a plan distribution, and your plan may require full repayment if you leave your job.

There is one escape hatch, newer than most advice online. A loan in good standing that gets offset because you left is a qualified plan loan offset, and you can roll that amount into an IRA or a new plan by your tax filing deadline, extensions included, so up to mid-October.

The catch is finding that money elsewhere, which most people who just lost a job cannot. If you can, the rollover is the difference between paperwork and a five-figure tax bill.

Federal data on how often this ends badly is thin by design. The GAO found in 2019 that workers aged 25 to 55 pulled at least $29.2 billion out of employer plans early in one year through hardship withdrawals, cashouts and unrepaid loans, and asked that the Form 5500 track unrepaid loans separately, which it still does not.

8. What a Default Actually Costs

Quick Answer: For a worker in the 22% federal bracket and under 59½, an unpaid balance costs 32 cents on the dollar in federal tax alone. A $12,000 balance means a $3,840 bill the following April, on money you no longer have.

Two things make this worse than it looks. The balance leaves your account permanently, so you lose the money and pay tax on it. And severance the same year can push you past the 22% bracket.

9. Your Exposure Shrinks Every Year

Quick Answer: The risk of a 401k loan is not constant. It decays. On a $12,000 loan, the tax owed if you lost the job falls from $3,186 after year one to $893 after year four. That curve, not the rate, is what to plan around.

Read the last column as the exposure you carry. It peaks in the first eighteen months: exactly when a probation period or a shaky employer is most likely to end the job. Borrowing less, or borrowing during a stable stretch, cuts that peak sharply. Total interest across the loan is $2,513, and it goes back into your own account, unlike interest on a transfer card or personal loan.

10. The Lost-Growth Argument, Priced Honestly

Quick Answer: The warning that you miss out on market growth is real but usually overstated, because you are paying 7.75% back into the account while the money is out. The bigger leak is the contributions people stop making to afford the payment.

Run the two effects side by side:

• The out-of-market gap is partly filled. Your balance earns the loan rate instead of the market return: a spread, not the whole return.
• Stopped contributions are a full loss. Skip a $300 contribution with a 50% match and you give up $450 a month, permanently, with nothing coming back.
• Repeat borrowing compounds it. EBRI found 29% of consistent participants had a loan at some point across five years, far above the share holding one at any moment.

The market-timing loss is a coin flip; the contribution loss is certain. If you cannot keep contributing up to the full match while repaying, the loan is too big, and it will show in what you need to retire.

11. When It Fits, and When to Rule It Out

Quick Answer: Four conditions have to hold together: stable employment, debt costing more than about 10%, a payoff you can finish well inside five years, and room to keep contributing to the match. Miss one and a cheaper borrowing route usually wins.

The clearest cases for borrowing:

• Killing a card balance above 20% with secure income. Huge rate gap, fast payoff. The textbook use.
• Covering a closing shortfall on a home purchase. The primary-residence exception lets the term run past five years, and the money buys an asset.
• Bridging a short, known gap. A bonus or property sale six months out makes early repayment realistic, collapsing the exposure window.
• Avoiding a hardship withdrawal. A loan repaid beats a withdrawal taken, which is taxed immediately and never comes back.

And where the answer is no:

• Layoff risk, probation, or a company in trouble. You would carry year-one exposure at its worst.
• Ongoing overspending. Clearing a card without fixing the cash-flow gap leaves you with a card balance and a plan loan.
• Planning to change jobs. A voluntary move triggers the same offset as a layoff.
• Near retirement, or no emergency fund. Build a small cash buffer first.

One more that gets missed: mortgage underwriters count the repayment as a monthly obligation even though the loan never touches your credit file, so borrowing shortly before applying hurts your debt-to-income ratio. And when a medical bill has free options, take those first.

12. Where It Ranks Against Five Other Routes

Quick Answer: Ranked on rate, the 401k loan sits second of six. Ranked on what happens when things go wrong, it sits fifth. That split is the whole decision, and it is why free routes come first in our borrowing comparisons.

13. Conclusion

Quick Answer: Judge a 401k loan on your first-year exposure, not its rate. If a job loss in the next eighteen months would leave you unable to write a four-figure tax check, borrow less or borrow elsewhere.

The rate is good and the interest does come back to you. That is why this loan is worth considering, and why it gets taken too casually.

The tax bill on an unpaid balance is roughly a third of it, and it arrives in the worst possible year. Size the loan against that number, protect the match, and check whether your plan lets you keep paying after you leave. Weigh it against a plain payoff order first.

14. Frequently Asked Questions

1. Does a 401(k) loan show up on my credit report?

No. There is no credit check and no tradeline is reported, so it cannot move your score either way. Mortgage and auto underwriters still count the repayment as a monthly obligation once they see it on your pay stub.

2. Can I take a loan and a hardship withdrawal at the same time?

Sometimes, but plans usually require you to exhaust loan options first. A loan is repaid and restores your balance. A withdrawal is taxed immediately, may carry the 10% additional tax, and can never be put back.

3. What if I want to repay the loan early?

Most plans allow early payoff without a penalty, and it is usually the right move because it shortens your exposure window. Check whether yours takes lump sums or only faster payroll deductions.

4. Do I really have until October to fix an offset after leaving a job?

Yes, if the loan was in good standing and the offset happened because you left. Roll the amount into an IRA or a new plan by your tax filing deadline; an extension pushes that to mid-October.

General information, not financial, legal or tax advice. See our disclaimer.