WARNING: THE FOLLOWING IS A BIT COMPLICATED BUT MAY BE OF SOME INTEREST TO A COUPLE OF GETBIGGERS. SO NOW I HAVE TO DO SOME MATHWORK AND POSSIBLY TALK TO MAYWEATHER WHOM I RARELY SEE ON THE GYM BASKETBALL COURT.
The late filing penalty is 5% of the additional taxes owed amount for every month (or fraction thereof) your return is late, up to a maximum of 25%.
If you file more than 60 days after the due date, the minimum penalty is $135 or 100% of your unpaid tax, whichever is smaller.
The late payment penalty is 0.5% (1/2 of 1 percent) of the additional tax owed amount for every month (or fraction thereof) the owed tax remains unpaid, up to a maximum of 25%.
For any month(s) in which both the late-payment and late-filing penalties apply, the 0.5% late-payment penalty is waived.
Your actual amount obviously varies depending on how much you owe and how late you are.