How are penalty/interest charges calculated for failure to file estimate payments or underpayment of estimate payments?

Penalty is 25% for failing to file estimated payments or 10% of underpaid tax per quarter.

Exception: Per MCL 205.23(3) Except as provided in subsection (4), if any part of the deficiency or an excessive claim for credit is due to negligence, but without intent to defraud, a penalty of $10.00 or 10% of the total amount of the deficiency in the tax, whichever is greater, plus interest as provided in subsection (2), shall be added.

Interest is 1% above the prime rate.