Here’s how to calculate how much you’ll pay in sales tax on a product. Use this sales tax formula: sales tax = list price x sales tax rate (as a decimal). For example, Sarah is purchasing a ...

Act, 1956 came into force on January 5, 1957, while CST rate was 1% originally and was increased to 2% and then to 3% and 4% (with effect from July 1, 1975), according to the Department of Revenue.