There will be three (3) taxes on retail sale of cannabis: the state’s usual 6.35 percent sales tax, a 3 percent sales tax dedicated to the city or town where the sale occurs, and a tax based on THC content that will cost approximately 10 to 15 percent of the sale price. In total, the tax rate is expected to be approximately 20 percent of the retail price of cannabis, in line with the tax rates in Massachusetts.