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To calculate the sales tax that is included in a company's receipts from items subject to sales tax, divide the receipts by 1 + the sales tax rate. For example, if the sales tax rate is 6%, divide the total amount of receipts by 1.06.How do you calculate the tax on a purchase?
Calculate sales tax percentage by multiplying the percentage of the sales tax by the total cost of the item(s) subject to the tax, states Basic-mathematics.com. To find the tax percentage rate on a purchase using only the subtotal and amount of tax, divide the total cost by the pre-taxed amount.How do you calculate federal effective tax rate?
To calculate effective tax with these inclusions, add together all of the tax under consideration and divide it by the individual's income.