Understanding early withdrawals
Early withdrawals occur if you receive money from a 401(k) before age 59 1/2. In most, but not all, circumstances, this triggers an early withdrawal penalty of 10% of the amount withdrawn.
For example, taking a $10,000 early withdrawal would require you to pay $1,000 in tax to the IRS. This is in addition to the tax ordinarily assessed on 401(k) withdrawals, which depends on your ordinary income tax rate.
When you withdraw money early from a 401(k), the distributed funds are no longer invested and cease to compound. While many people considering early withdrawals focus on the 10% penalty, the opportunity cost of withdrawing funds from your account prior to retirement is likely orders of magnitude greater.
If you withdraw $10,000 from your 401(k) at the age of 30, then your account balance would be almost $107,000 lower at the age of 65 (assuming a 7% average annual return on investment) than if that money had remained invested.