Sales Tax Calculator
Add sales tax to a net price, or strip it out of a tax-inclusive total, at any rate — and see the tax amount clearly.
Adding and removing sales tax
To add sales tax, multiply the net price by the tax rate and add it on: tax = price × rate/100; total = price + tax. To remove tax from a tax-inclusive price, divide by (1 + rate/100) — you cannot simply subtract the percentage, because the tax was calculated on the smaller net amount.
Real-world example
On a net price of 2,000 at 8% sales tax, the tax is 160 and the total is 2,160. Working backwards from a tax-inclusive 2,160: net = 2,160 ÷ 1.08 = 2,000, with 160 of tax.
Why you divide, not subtract
If a 2,160 price includes 8% tax, the 8% was charged on 2,000, not 2,160. Subtracting 8% of 2,160 gives the wrong base — dividing by 1.08 gives the right one.
Frequently asked questions
Multiply the net price by the tax rate divided by 100 and add it. For 8% on 2,000: tax is 160, total is 2,160.
Divide the tax-inclusive total by (1 + rate/100). For an 8% inclusive 2,160: 2,160 ÷ 1.08 = 2,000 net.
Because the tax was calculated on the smaller net amount, not the larger inclusive total. Dividing by (1 + rate) gives the correct base.
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