Interesting! Thanks RC for that info.Edit: Rickb says it expired, so the following information is probably not important...
First of all: Motorcycles and three-wheeled EVs get a max of 10% sticker price or $2,500, whichever is less. Your Solo will NOT get you a $7500 credit. $2500, tops, and that's only if you pay more then $25,000 for it.
As to how it works: It's an income tax reduction. You pay the full amount for the vehicle, and the $7,500 is claimed on your next tax return. If you can't take advantage of the full $7,500 reduction, then you lose the excess credit. I.e. if your total taxes for the year were $3,000, then you get a $3,000 reduction, and you lose the extra $4,500. If you lease the vehicle, the owner of reord get the credit, which isn't you. It's probably the manufacturer or leasing company. They *may* pass the credit along to you in the form of a lower lease price. Make sure you force them prove it, or you're not getting it.
Here's a link to an article from Edmunds that explains it all in greater detail:
https://www.edmunds.com/fuel-economy/the-ins-and-outs-of-electric-vehicle-tax-credits.html
Interesting note: The $7,500 is based on the battery size of the vehicle. Plug-in hybrids generally don't get the full amount.