The 2015 Michigan Proposal 1, also known as the Michigan Sales Tax Increase for Transportation Amendment, was 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 was estimated by the Associated Press to result in an average tax increase of $545 per household in 2016.