Borrowing from your 401k feels like a cheat code.
You're paying yourself back, the interest goes into your own account, and no bank has to approve you.
If you leave your job — quit, get laid off, get fired — while you still owe money on that loan, the remaining balance typically becomes a taxable distribution.
You don't get a grace period measured in years.
In many plans it's 60 days, sometimes less, to repay the whole thing or face the tax hit.
That means a $15,000 outstanding loan could suddenly count as $15,000 of income on your W-2.
Add the 10% early withdrawal penalty if you're under 59½, and you're looking at a bill that can run into the thousands — for money you never actually pocketed.
Say you're in the 22% federal bracket and your state takes another 5%.
That $15,000 becomes roughly $4,050 in federal tax, $750 in state tax, and $1,500 in penalty.
Call it $6,300 owed on cash that's already spent.
The IRS doesn't care that the money went to your kitchen remodel.
Straight withdrawals carry their own sting.
Pull $10,000 out of your 401k at 40 and you'll hand over $1,000 in penalty plus income tax.
You keep about $6,800 of the $10,000 — and you've permanently removed money that had decades of compounding left to do.
The IRS waives the 10% penalty for certain situations: total and permanent disability, birth or adoption of a child (up to $5,000), qualifying medical expenses above 7.5% of your income, and a few others.
If you're facing a real cash crunch, the order of operations matters.
A 0% intro APR credit card next, if you can pay it off before the promo ends.
A 401k loan only if you're confident you'll stay put.
One more thing worth checking: some plans let you keep making loan payments after you leave if you set up automatic debits.
The rule isn't universal, but plenty of people have avoided a five-figure tax bill with one phone call.
If you've already taken the loan and you're worried about your job, call your plan administrator this week.
Not after the layoff rumor becomes a memo.
Final Thoughts
The clock on repayment often starts the day your employment ends, and the IRS is not known for its flexibility.