State agencies (existing): treasury; online tariff calculator; provide for. Amends 1941 PA 122 (MCL 205.1 - 205.31) by adding sec. 5a.

HB 5639 requires Michigan's Department of Treasury to create an online tariff calculator on its website within 90 days of the law taking effect. The tool will let Michigan residents estimate how tariffs imposed by the U.S. government (after January 20, 2025) or foreign governments (after January 20, 2025) affect their personal finances by inputting zip code, household income, and spending habits. The bill defines "tariffs" as import duties levied on or after January 20, 2025, and focuses on providing individuals with a clear way to understand potential financial impacts. This is a procedural requirement for the state treasury, not a change to tax rates or policies.