You buy a car for 20000 dollars and pay 5 in tax. Take the total price and divide it by one plus the tax rate. Lets be honest - sometimes the best reverse sales tax calculator is the one that is easy to use and doesnt require us to even know what the reverse sales tax formula is in the first place.
Now multiply that by 12 to find the sales tax.
Tax Responsibilities Sales Tax. L w l w. Purchase price x sales tax rate sales tax. So if your tax rate is 07 in decimal form heres the calculation to convert it into a percentage.