A 401(k) loan lets you borrow money from your own retirement savings and pay it back with interest, all without a credit check or a traditional lender. You can typically borrow up to 50% of your vested balance or $50,000, whichever is less, and repay the loan through automatic payroll deductions over five years. The money you borrow comes directly from your account, and the interest you pay goes back into your account rather than to a bank. That sounds straightforward, but the details around repayment, taxes, and what happens if you leave your job matter a lot.
How Much You Can Borrow
The IRS caps 401(k) loans at the lesser of 50% of your vested account balance or $50,000. If your vested balance is $80,000, your maximum loan is $40,000. If your vested balance is $150,000, you’re still capped at $50,000. “Vested” means the portion of your account you actually own outright. Your own contributions are always 100% vested, but employer matching contributions may vest gradually over several years depending on your plan’s schedule.
There’s one small exception: if 50% of your vested balance is less than $10,000, some plans allow you to borrow up to $10,000. So if your vested balance is $15,000, you might be able to borrow $10,000 instead of the $7,500 that the 50% rule would allow. Not all plans include this exception, though, and not all plans offer loans at all. Your plan’s summary document will spell out what’s available.
How Interest and Repayment Work
The interest rate on a 401(k) loan is typically set at the prime rate plus 1%. That rate is locked in when you take the loan. Unlike a bank loan, you’re paying this interest to yourself. Every payment, principal and interest, goes back into your 401(k) account. So in one sense, you’re not “losing” the interest, but you are losing whatever investment returns that money would have earned had it stayed invested.
Repayment happens through payroll deductions, usually on an amortizing schedule where each payment covers both principal and interest, similar to a car loan. The standard repayment term is five years. If you’re using the loan to buy a primary residence, your plan may allow a longer repayment period, sometimes up to 15 or 25 years.
Most plans charge a small origination or maintenance fee, often in the range of $50 to $100. Some plans also limit the number of loans you can have outstanding at any given time.
What Happens to Your Investments
When you take a 401(k) loan, the money is pulled from your invested balance. That means whatever you borrow is no longer growing in the market. If your account is invested in a mix of stock and bond funds averaging 7% to 8% annual returns, and you’re paying yourself back at 5% to 6% interest, the gap between those numbers is real money you’re giving up over time.
On a $20,000 loan repaid over five years, that difference in returns could cost you several thousand dollars in lost growth, and the impact compounds because those lost gains would have continued growing for years or decades until retirement. This opportunity cost is the biggest hidden expense of a 401(k) loan and the one most borrowers underestimate.
Tax Treatment
As long as you repay the loan on schedule, there are no taxes or penalties. The money isn’t treated as a distribution, so it doesn’t show up on your tax return. This is one of the main advantages over a 401(k) hardship withdrawal, which triggers income taxes and potentially a 10% early withdrawal penalty.
However, there’s a wrinkle worth understanding. The contributions you originally made to your 401(k) were pre-tax, meaning you got a tax deduction when the money went in. When you repay the loan, you’re repaying with after-tax dollars from your paycheck. Then, when you eventually withdraw that money in retirement, you’ll pay income tax on it again. The loan principal effectively gets taxed twice: once when you earn the money to repay the loan, and again when you take retirement distributions. This double taxation applies to the repayment amount and is a cost that rarely gets mentioned in plan materials.
What Happens If You Leave Your Job
This is where 401(k) loans get risky. If you quit, get laid off, or are fired while you have an outstanding loan balance, the clock starts ticking fast. Most plans give you 60 to 90 days to repay the remaining balance in full. Without payroll deductions flowing in, you’ll need to come up with a lump sum on your own.
If you can’t repay within that window, the outstanding balance is treated as a distribution. That means it gets added to your taxable income for the year, and if you’re under age 59½, you’ll also owe a 10% early withdrawal penalty on top of the income tax. On a $15,000 unpaid loan balance, a borrower in the 22% tax bracket who’s under 59½ would owe roughly $4,800 in taxes and penalties.
This job-loss risk makes 401(k) loans particularly dangerous if your employment situation is uncertain. Even if you feel secure, layoffs aren’t always predictable. Before borrowing, consider whether you could realistically write a check for the full remaining balance on short notice.
Steps to Take Out a 401(k) Loan
The process is simpler than applying for a traditional loan. There’s no credit check, no income verification, and no underwriting. You apply through your plan administrator, which is typically the financial company that manages your 401(k), such as Fidelity, Vanguard, or Schwab. Most plans let you initiate the request online or by phone.
You’ll select how much you want to borrow, choose your repayment term (up to five years for a general-purpose loan), and review the interest rate and any fees. Once approved, the funds are usually deposited into your bank account within a few business days. Repayments begin with your next payroll cycle, and the deductions continue automatically until the loan is paid off. You can typically pay off the balance early without a prepayment penalty.
When a 401(k) Loan Can Make Sense
A 401(k) loan is worth considering when you need a relatively small amount of money for a short period and you have stable employment. Common uses include consolidating high-interest credit card debt, covering an emergency expense, or bridging a short-term cash gap. If you’re carrying credit card balances at 20% or higher, borrowing from your 401(k) at 5% to 6% and paying yourself back can save real money in interest, as long as you repay on schedule and don’t run the cards back up.
The loan makes less sense for large amounts, long time horizons, or situations where your job stability is questionable. It also makes less sense if you’re close to retirement, since pulling money out of the market during your final accumulation years has an outsized impact on your ending balance. For younger borrowers with decades until retirement, a small loan repaid quickly has a more modest long-term effect, but it’s still worth running the numbers before committing.
Recent Changes Under SECURE 2.0
The SECURE 2.0 Act, passed in late 2022, included a provision that allows plan sponsors to increase the loan limit for participants who qualify under certain conditions, such as those affected by federally declared disasters. Qualifying individuals may also receive up to an additional year beyond the standard repayment period to pay back their loans. These provisions are optional for employers, so not every plan will offer them. Check with your plan administrator to see if your plan has adopted any of these expanded options.