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Under what circumstance will the IRS charge you a late-payment penalty for taxes?
I just got hit with the late payment penalty due to a bug in the H&R Block tax program.  The underpayment was only $2 and the penalty was a whopping 1 cent.   The letter that informed me of the error also said that they did not consider the $2.01 worth collecting, the amount owed had been zeroed.