In an ideal world, this is how electric-car tax credits should work

2017 Chevrolet Bolt EV electric car at EVgo fast-charging station, Newport Centre, Jersey City, NJThe tax reform bill likely to be voted on by the U.S. Senate and House of Representatives retained a number of provisions originally slated to be cut from the tax code. Among them was the federal income-tax credit for purchase of a plug-in electric vehicle. Three carmakers—General Motors, Nissan, and Tesla—have now used more than half...