Mich. Const. art. IX, § 25

Property taxes and other local taxes and state taxation and spending may not be increased above the limitations specified herein without direct voter approval. The state is prohibited from requiring any new or expanded activities by local governments without full state financing, from reducing the proportion of state spending in the form of aid to local governments, or from shifting the tax burden to local government. A provision for emergency conditions is established and the repayment of voter approved bonded indebtedness is guaranteed. Implementation of this section is specified in Sections 26 through 34, inclusive, of this Article.