Do you charge sales tax to Mass residents?

If you live in mass, order online and pickup at the store no tax. Or drive to the store no tax, if the store has to deliver to mass, yes tax

Call the store and ask them

If they ship you furniture to an address which is not in New Hampshire, they will charge you sales tax according to your state of residence.

If you buy in NH you do not pay sales tax regardless of where you live

I believe you do not have to pay any sales tax regardless of the state your from. The sale is made in a state which does not have a sales tax.