Just buy in wonderful tax-free NH. Yeah, we're awesome like that!
Also, as far as I am aware (unless something changed recently), NH dealers refuse to collect out-of-state taxes.
I think Mass might ding you for the tax on a car you buy in NH when you go to register it.
Not really knowledgable about that, as I've never lived in Mass. How would they do this though? Would they base the tax on sale price, and if so, couldn't you just tell them you paid $1? Or would they base the tax on ERV?
I think if a person is willing to lie and fake a bill of sale, etc, he/she may be able to get away with many things. However in this case I actually think they base the tax on car value.
I purchased a Civic for my daughter recently (an in Mass purchase from a person), and I got a pretty decent deal. I produced my bill of sale, but as memory serves, at registration I paid tax based on the actual value of the car rather than the purchase price. Not sure how they account for damaged vehicles in terms of value. I may be wrong about this, but pretty sure they used market value to assess the tax.