A minimum failure-to-file penalty will be added to your account if you file a tax return more than 60 days late. The failure-to-pay penalty is 0.5% of your balance due for each month (or part of a month) in which your taxes remain unpaid. You will be charged up to a maximum of 25 percent of the amount still owed. This penalty is included on top of the already due amount required to satisfy the taxed amount.