Michigan Compiled Laws, Chapter 211. Taxation of Real and Personal Property § 211.44b

Sec. 44b. For purposes of determining the date payment of the tax is received under this act, the date of a United States postal service postmark may be considered the date of receipt. However, a tax payment shall not be considered received prior to 7 calendar days before the date of actual receipt. This section does not apply to the payment of the tax prior to the sale provided under section 60.  1