We do not have a VAT system nor a GST one.
you dont HAVE to do anything if you dont want to, but there are consequences
You dont pay sales tax to the person you are buying it from, you will pay that at the dmv when you get the title for it.
you dont have to pay tax
yes. you dont have to pay double tax
tax
Generally no. If you are a US citizen, you are obligated to pay US tax whether you work on US land, US water or outside the US. If you must also must pay foreign income tax, generally you are able to deduct this amount from your US tax.
In Nebraska sales tax is on the payment so you dont pay the tax upfront like on a "buy" you would pay the sales tax each month i.e. pmt $300 tax 7%=$21.00 your pmt $321.00 with no up front tax
Yes. They pay taxes and publish what they pay.
no that does not mean they can not pay state tax. There are many things that happen if a state is outside the continental us, but since it is a state, that means that it still has to pay state tax.
no u dont everything is tax free
it depends on where in the US you are living
Yes