Found on a finacial advice site:
But cashing out of a 401(k) before you are 59 ½ can cost you dearly, both immediately and in the long run:
- If you do not transfer your money to an IRA or your new employer's
plan within 60 days of receiving it, your current employer is required
to withhold 20% of your account balance to prepay federal taxes.
- If you keep the money, you must pay federal income tax on your
entire withdrawal. In addition, you may also owe state tax on your
distribution.
- Plus, the IRS will consider your payout an early distribution,
meaning you could owe a 10% early withdrawal penalty on top of combined
federal, state, and local taxes.
When all is said and done, you could end up with a little more than
half of your original 401(k) savings! In addition, you will owe tax
annually on any future earnings your lump sum generates.