Swipe your 401(k) before age 59½ and the IRS takes a cut before you ever see the money.
The standard hit is a 10% early withdrawal penalty on top of regular income tax.
On a $20,000 withdrawal, that penalty alone is $2,000, and the tax bill can push the real cost closer to $5,000 or more depending on your bracket.
Here's what stings most: many people pull the cash for an emergency and don't realize the penalty applies even if they never touch the account again.
Employers typically withhold 20% for federal taxes upfront, so a $20,000 request might land as $16,000 in your hand.
Then you still owe the 10% penalty when you file, plus any state tax.
You can dodge the 10% penalty if you're 59½ or older, if you're totally and permanently disabled, or if you've separated from your job at 55 or older (the "rule of 55" applies only to that employer's plan).
A qualified birth or adoption, certain medical expenses, or a federally declared disaster can also open the door.
The biggest trap is the 60-day rollover rule.
If you take a distribution and don't deposit the full amount back into an eligible retirement account within 60 days, the IRS treats the entire sum as taxable income.
That means the 20% withheld by your plan is gone for good unless you replace it out of pocket.
Miss the window and you're looking at both the tax and the penalty.
One more wrinkle: first-time homebuyers can withdraw up to $10,000 penalty-free, but the income tax still applies.
And it's per person, not per couple, so a married couple could each tap $10,000 from their own plans.
If you're weighing a withdrawal, run the numbers before you click.
A $10,000 loan from your 401(k) may cost less than a permanent withdrawal, though you'll repay it with after-tax dollars and face tax if you leave the job before it's repaid.
Many plans don't require a reason for hardship withdrawals, but that flexibility isn't free.
The takeaway is simple: the 10% penalty is only the headline cost.
Add income tax, lost compounding, and the risk of a botched rollover, and a short-term cash grab can shrink your retirement nest egg by far more than the sticker price suggests.
Opinion: A 401(k) is not a checking account, and treating it like one rarely ends well.
Final Thoughts
Before you touch that balance, do the math on what you're really giving up, because the IRS gets its cut either way.