![Chevrolet Bolt EV being charged outside Go Forth electric-car showroom, Portland [photo: Forth]](http://images.hgmsites.net/tmb/chevrolet-bolt-ev-being-charged-outside-go-forth-electric-car-showroom-portland-photo-forth_100606247_t.gif)
It's clear that incentives to buy specific cars work best when they can be applied directly at the time of sale. That's why purchase rebates are widely preferred by electric-car advocates to tax credits, which may take up to 15 months to be usable, depending on the timing of the purchase and tax filing. While the federal electric-car incentive is...