In my case, last Fall, the dealer knew all of this stuff and was anxious to let me know all of the available incentives. The bargaining began AFTER all of the incentives had been applied. And, the Federal tax credit applies only to your tax liability in the year you purchase the car and you will only receive the full credit if you actually owe the $7500. So call the dealer and ask them what applies..... and once you have seen their offer you can begin the fun!
2015 Leaf sold
2019 Leaf Plus S as of 9/30/19