The penalty isn't a static percentage or a flat dollar amount. It’s based on several factors, including the total underpayment amount and the period during which taxes were underpaid. Underpayments are subject to the failure-to-pay penalty, which is 0.5% of the amount owed for each month ...
Early withdrawals from a 401(k) account (i.e., before age 59½) incur a 10% penalty. Furthermore, any deferred taxes due on that money will be owed at the time of withdrawal. The penalty is the same for an individual retirement account (IRA).3 What Is the Early Withdrawal Penalty ...