Swimmmer - you will not pay a sales tax on materials. The equipment will be taxed. Once you are a registered business you can write off all your expenses. That includes space rented and auto expenses. The states of MA & RI will require a tax payment monthly. Screw up and the penalties fly.
The tax that really croaks you is the extra 15% tax you have to pay to be in business.
Just wait till you get audited!
