Individual income tax: returns; extension of filing deadline for income taxes under certain circumstances; authorize. Amends sec. 301a of 1967 PA 281 (MCL 206.301a).

SB 124 automatically extends Michigan individual income tax filing deadlines to match any federal extension provided by the IRS for the same tax year. It applies to taxpayers required to file annual returns, ensuring their state deadline aligns with the IRS extension date. The state tax department must publish any extended deadline and taxpayers cannot be charged interest or penalties during the extension period. This bill changes the process for deadline extensions but does not alter tax rates or benefits.