If you buy one now you should be able to claim any credits available for the quarter you purchase the car in. The IRS master list is a guide only - it doesn't show the 2016 Volt either but if you find one of those still on a dealer lot it would also qualify. CARB is a different story so you'll have to check with them.Check again on Jan 1, 2018 for federal credits. As for CA, I am sure it will be added around the time GM starts shipping 2018 Volts, if they continue to qualify.