Rule 4155.
When a nomination or sustaining payment in a stake, futurity, early closing race, or late closing race becomes payable on a Sunday or legal holiday that falls on Saturday, the payment is to be due on the following Monday, and, if made by mail, the envelope shall be postmarked on or before the following Tuesday. If a payment falls on a Monday that is a legal holiday, the payment is due on Tuesday, and, if made by mail, shall be postmarked on or before the following Wednesday. The provisions of this section do not apply to declarations to start.
Mich. Admin. Code R. 431.4155