How the deadline actually works
When you leave a job with an unpaid 401(k) loan, the clock that matters isn't the loan's payment schedule — it's the tax clock. Here is the chain of events the calculator above models.
Leaving your employer is a "distribution event." If you don't repay the outstanding balance, the plan eventually offsets it — it reduces your account by the unpaid amount to settle the loan. A plan loan offset is treated as an actual distribution: real, taxable money leaves your retirement account, and it shows up on a Form 1099-R the following January.
The good news is that an offset is an eligible rollover distribution. If you replace the offset amount with your own cash and roll it into an IRA or a new employer's plan by the deadline, the distribution is tax-free — exactly as if it never happened. The whole game is the date.
QPLO vs. deemed distribution — the branch that changes your deadline
Not every offset gets the same clock. The single most important question is whether your loan was in good standing when you left, or already in default.
Good standing → QPLO
Extended rollover clock
Already defaulted → deemed
No extended clock
This is the difference that the prose calculators on page one never compute for you. Tell the calculator which side you're on and it shows the correct deadline — or correctly tells you there isn't a rollover window at all.
What counts as a loan "in good standing"
"Good standing" isn't a judgment call — it's whether the loan still met the IRC §72(p) rules the day you left. A conforming plan loan was for no more than the lesser of $50,000 or half your vested balance, carried a repayment term of five years or less (longer only if it bought your main home), and required level, amortized payments at least quarterly.
A loan falls out of good standing — becoming a deemed distribution — when you miss payments and don't make up the shortfall by the end of the cure period. A plan can set that no later than the last day of the calendar quarter following the quarter you missed a payment. Miss the cure window and the loan is taxed in that year. Only a loan that was still in good standing at separation can become a qualified plan loan offset with the extended rollover clock — which is exactly the branch the calculator asks you to pick.
The extension toggle, and why it buys you six months
The QPLO rollover deadline is tied to your federal income-tax filing due date for the year the offset occurs. For a calendar-year filer that's April 15 of the following year. File (or simply file Form 4868 to extend) and that due date — and therefore your rollover deadline — moves to October 15. The extension is the difference between a few months and most of a year to come up with the cash.
Worth knowing
Even without filing an extension, if you file your return by the regular due date you may still get an automatic six-month grace period to finish the rollover under Treas. Reg. §301.9100-2(b). The calculator shows the conservative unextended date by default; flip the toggle to plan around the extended one.
Which year the offset lands in — it may not be your separation year
Your rollover clock is tied to the tax year the offset actually occurs, not necessarily the year you walked out the door. Separate late in the year and have the plan offset the balance the following quarter, and the offset can fall into the next calendar year — which moves your filing-due-date deadline out by a full year.
That's why the calculator anchors on an estimated offset date rather than your last day of work: a December separation and a January offset are taxed, and timed, differently. When the exact offset date matters, your plan administrator can tell you when the balance will actually be offset — and that date sets which year's return your deadline follows.
How you actually roll over the offset
Rolling over an offset isn't like a normal rollover, because no money is ever handed to you. The offset already used your account balance to cancel the loan, so to "roll it over" you have to come up with an equal amount of your own cash and deposit it into an eligible account — a traditional IRA, or a new employer's plan that accepts rollovers — by the deadline.
You can roll over all or part of the offset. Whatever you deposit by the deadline is tax-free; only the portion you don't replace is taxed, plus the 10% penalty if you're under 59½. The plan reports the offset on Form 1099-R — a qualified plan loan offset carries distribution code M in box 7 to flag it — and the receiving IRA custodian later issues a Form 5498 confirming your deposit. Keep both: together they're how you prove the rollover happened.
The tax and the 10% penalty if you miss it
If the offset amount isn't rolled over in time, it becomes ordinary income for the offset year. If you're under age 59½ and no other exception applies, the IRS adds a 10% early-withdrawal penalty on top. On a five-figure balance that combination is often the difference between a planned rollover and an unwelcome surprise the next January.
Use the optional fields in the calculator to dollarize your own exposure — balance times your marginal rate, plus the penalty if it applies. It's a rough estimate, not a tax return, but it makes the stakes concrete.
Your plan can be stricter than the IRS
The dates above are the federal backstop. Many plans demand full repayment of the loan within a short window — often 60 to 90 days — after you separate, and will offset sooner than the IRS rules require. The plan's terms can be tighter than the tax law in every direction.
Do this first
Call your plan administrator and ask two things: the exact date your loan will be offset, and whether your plan allows continued repayment after separation. Those answers override the estimate here.
What this tool does not cover
- Full 401(k) loan amortization — use your plan's loan calculator for the payment math.
- Roth/after-tax basis edge cases beyond the good-standing flag.
- State income-tax treatment of the distribution — it exists and varies; we don't model all 50.
- CARES-era and federally-declared-disaster special extensions — these exist; confirm with the IRS if one applies to you.
Primary sources: IRS — Plan Loan Offsets, IRC §72(p) and §402(c)(3), and IRS Topic No. 558 (the additional 10% tax).
Frequently asked questions
How long do I have to pay back my 401(k) loan after leaving a job?
If your loan was in good standing, you don't have to "pay it back" to the plan at all to avoid tax — you have to roll the offset amount over. That deadline is your federal tax-filing due date including extensions for the year the offset occurs: April 15 of the following year, or October 15 with a filed extension. Not 60 days.
The loan itself, though, may come due much sooner under your plan's own terms — often 60–90 days. Confirm the offset date with your administrator.
What happens to my 401(k) loan if I quit?
Quitting is a distribution event. If you don't repay, the plan offsets the unpaid balance against your account. That offset is an actual, taxable distribution reported on Form 1099-R — taxable income plus a 10% penalty if you're under 59½ — unless you roll the offset amount over by the deadline.
Can I roll over a 401(k) loan offset?
Yes — if it's a qualified plan loan offset (QPLO). That means the loan was in good standing and is offset because you separated (within 12 months) or the plan terminated. You roll over the offset amount with your own cash by your tax-filing due date including extensions.
If the loan was already in default before you left, it's a deemed distribution, which generally cannot be rolled over and gets no extended window.
Is a 401(k) loan taxable if I leave my job?
Only if you don't repay or roll it over in time. The offset amount is ordinary income for the offset year, plus a 10% penalty under 59½. Roll the offset amount into an IRA or new employer plan by the deadline and it stays tax-free.
Do I have until tax day to pay back my 401(k) loan?
For a QPLO, your rollover deadline is tax day for the offset year — and later if you extend. But "tax day" is the rollover deadline, not necessarily when the loan is due to the plan. The plan can require repayment far earlier; the tax deadline is only your backstop for avoiding the tax.