Whether you get a tax refund or not doesn't affect whether you are elegible for state and federal rebates of credits. But I found out the hard way that although I got the full state rebate and the full tax credit from the car, and I got a state rebate for the EVSE, i did not qualify for the federal 30% tax credit because of a complex convolution of too high of an income, already doing getting the $7500 fed tax credit during the same year, and something in AMT. I'm not sure if I waited a few months to buy the EVSE whether I would have gotten that 30% fed credit, but it was only a few hundred dollars difference to me.