The Michigan Sales Tax Increase for Transportation Amendment, Proposal 15-1 is a referendum held on May 5, 2015, concerning a legislatively-referred ballot measure. The measure's approval would have caused one constitutional amendment and 10 statutes to go into effect. It is estimated that Proposal 1 would raise state revenues from sales and use taxes by $1.427 billion, fuel taxes by $463 million, truck registration fees by $50 million, and vehicle registration fees by $10.1 million in the first year. If approved, the proposal would have resulted in average tax increase of $545 per household in 2016, according to an estimate by the Associated Press.