The Michigan Department of Treasury has been made aware that some "Reminder of Tax Due" letters sent to taxpayers contain an incorrect toll-free (1-800) TTY number, which may connect callers to a potential scam. Taxpayers with questions regarding unpaid individual income taxes are asked to contact the Treasury directly at 517-636-4486. We apologize for any confusion or concern this may have caused.
Calculate Late Penalty and Interest
The Revenue Act includes provisions for charging penalty and interest if a taxpayer fails to pay a tax within the time specified.
INTEREST
Interest is calculated by multiplying the unpaid tax owed by the current interest rate.
PENALTY
Penalty is 5% of the total unpaid tax due for the first two months. After two months, 5% of the unpaid tax amount is assessed each month. The maximum late penalty is equal to 25% of the unpaid tax owed.