Borrowing from your own 401(k) feels lower-risk than it actually is — the loan itself isn’t a taxable event, but a job change with a balance still outstanding can turn it into one almost overnight.
The Two Real Caps
A 401(k) loan is capped at the lesser of $50,000 or 50% of your vested account balance. Someone with a $60,000 vested balance can borrow up to $30,000 (half their balance); someone with a $500,000 vested balance is still capped at the flat $50,000 dollar limit regardless of how much larger their account is. Whichever number is smaller controls.
Repayment Terms
Standard 401(k) loans must be repaid within five years through regular payments, typically deducted directly from payroll, covering both principal and interest. A loan used specifically to purchase a primary home can extend to 15 years — a real, meaningful exception most other loan purposes don’t get.
The Job-Loss Trap
If you leave your job — voluntarily or not — with an outstanding 401(k) loan balance, the old rule required immediate repayment or the balance became a taxable distribution within a very short window. That’s been replaced by a more forgiving deadline: you now have until your federal tax filing deadline for that year, including extensions, to repay the balance or roll it into an IRA. Leave a job in 2026 with a loan balance, and the effective deadline is April 15, 2027 — or October 15, 2027 if you file an extension.
What Happens If You Miss That Deadline
Any unpaid balance after the deadline is treated as a taxable distribution — ordinary income tax on the full unpaid amount, plus a 10% early withdrawal penalty if you’re under 59½. This is functionally identical to an early 401(k) withdrawal, except it happened by accident rather than by choice, and often at a moment — right after a job loss — when the tax bill is least affordable.
Why This Is Riskier Than It Looks Going In
Most people take a 401(k) loan assuming they’ll stay employed long enough to finish the standard five-year repayment schedule through payroll deduction. A layoff, a company acquisition, or simply changing jobs voluntarily resets that plan instantly — the loan doesn’t transfer to the new employer’s plan, and the repay-or-roll-over deadline starts ticking the moment you separate from the old employer, regardless of how much of the original five-year term was left.
The Bottom Line
Before taking a 401(k) loan, have a real plan for what happens if your employment ends before the loan is repaid — specifically, whether you could actually come up with the remaining balance in cash by the following year’s tax deadline. If the honest answer is no, the loan carries a real, non-obvious risk of becoming an expensive unplanned taxable distribution.
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