Actually, the MA law requires that ANY purchaser of a vehicle in MA pay the 6.25 percent sales taxes IN MA, within 20 days if you're registering it anywhere other than MA and within 10 days if you're registering in MA. The only exemption is for cars purchased from close family members.
Your obligation to pay sales tax in MA on a vehicle purchase has NOTHING to do with where or whether you register it.
Others have said:
Yes, you pay taxes in the state you register the car in. In your case, you live in N.H. so you will register it in N.H., and pay taxes there.
added: There are no sales taxes in NH.
If you live in Illinois you can buy a car in Wisconsin. You may have to pay the tax difference when you register the car in the state you live in.
You have to pay taxes on the car where you register it.
You pay Virginia taxes.
You pay NJ tax.
If you are bringing the car back to Ireland then you will have to pay tax on it.
You pay the tax rate base on where you live. If you live in Orange county but buy a car in Los Angeles, you'll pay only 8% sales tax instead of 9.
No, but you will have to pay for the registration in Missouri.
7.5 %
Yes- you pay the taxes when you register your car in the state you live in.
illinois
yes
You pay sales tax to whichever state you buy something from. It this case, it will be NY. However, you will have to pay property tax for your car in NJ because that is where you live.