New York’s School Tax Relief Program, STAR, provides state-funded property tax relief for homeowners. Like a matching grant, STAR changes the price of education, thereby altering the incentives of voters and school officials and leading to unintended consequences. Using data for New York State school districts before and after STAR was implemented, we find that STAR increased student performance, school district inefficiency, and school spending by 2 to 4 percent in most districts, leading to an average school property tax rate increase of 14 percent. The STAR-induced tax rate increases offset about one third of the initial STAR tax savings and boosted property taxes for business property. STAR did little to offset the existing inequities in New York State’s education finance system, particularly compared to an equal-cost increase in state aid. This article should be of interest to policy makers involved in property taxes or other aspects of education finance.