By Christian BrinkleyLicensed NC Insurance Agent, NPN 22217190, NC Life & Health · Updated October 14, 2026 · 4 min read
Your 401(k) balance looks tempting when money gets tight. It is your money, sitting right there. A 401(k) loan lets you borrow from it. But “borrowing from yourself” is not as harmless as it sounds. This is general information, not financial advice.
How a 401(k) loan works
Not every plan offers loans, so first check whether yours does. If it does, the mechanics are straightforward.
You borrow from your own account balance, up to limits set by law and your plan. You pay the money back to your own account, with interest, through payroll deductions, usually over five years. The interest goes back into your account, not to a bank.
There is no credit check. There is no lender judging your application. That ease is part of the appeal and part of the danger.
The double taxation concept
Here is the subtle cost people miss. You repay a 401(k) loan with after-tax dollars from your paycheck. Those dollars go back into your pre-tax account. Then when you withdraw that money in retirement, you pay income tax on it again.
Follow the trail. You earn a dollar, pay tax on it, use it to repay the loan, it lands in your 401(k), and years later you pay tax on it when you withdraw it. The same economic dollar gets taxed twice.
The job loss risk
This is the big one. If you leave your job, voluntarily or not, while a loan is outstanding, most plans require you to repay the remaining balance quickly, often within a short window after separation.
Lose your job and suddenly owe a lump sum back to your 401(k)? That is brutal timing. The loan comes due at the exact moment your income disappears.
The opportunity cost
While your money is out on loan to you, it is not invested. In a rising market, that is growth you will never get back. The interest you pay yourself is almost never as much as the market returns you missed.
People underestimate this because it is invisible. There is no statement line that says “growth you missed: $X.” But the math is relentless. Money pulled out in your 30s or 40s misses decades of compounding.
When people take them anyway
Life happens. People borrow from 401(k)s to stop a foreclosure, cover medical bills, or avoid truly terrible debt. Sometimes the 401(k) loan really is the least bad option on the table.
If you are considering one, be honest about which situation you are in. “Least bad option in a crisis” is very different from “easy money for a kitchen remodel.” The first can be defensible. The second is your future self paying for your present self's impatience.
If you do take one
Borrow the minimum you actually need, not the maximum allowed. Pay it back as fast as your plan permits. Keep contributing to the 401(k) while you repay if you possibly can, because pausing contributions stacks a second loss on top of the loan.
And have a plan for job loss. Know your plan's repayment deadline after separation before you borrow. If you are in an unstable job or industry, that deadline should scare you straight.
The bottom line
A 401(k) loan is easy to get and expensive in ways that do not show up on the paperwork. Double taxation on repayments. A repayment bomb if you lose your job. Years of missed growth.
Your 401(k) is not a savings account and not an emergency fund. Treat it like what it is: money your future self is counting on.
This is general information, not financial advice. Check your plan's loan rules and talk through alternatives before borrowing from retirement savings.
Questions people ask me about this
How does a 401(k) loan work?
Not every plan offers loans, so first check whether yours does. If it does, the mechanics are straightforward. You borrow from your own account balance, up to limits set by law and your plan. You pay the money back to your own account, with interest, through payroll deductions, usually over five years.
What is the double taxation concept?
Here is the subtle cost people miss. You repay a 401(k) loan with after-tax dollars from your paycheck. Those dollars go back into your pre-tax account. Then when you withdraw that money in retirement, you pay income tax on it again. Follow the trail.
What is the job loss risk?
This is the big one. If you leave your job, voluntarily or not, while a loan is outstanding, most plans require you to repay the remaining balance quickly, often within a short window after separation. Lose your job and suddenly owe a lump sum back to your 401(k)? That is brutal timing.
What is the opportunity cost?
While your money is out on loan to you, it is not invested. In a rising market, that is growth you will never get back. The interest you pay yourself is almost never as much as the market returns you missed. People underestimate this because it is invisible.
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