Enter the amount and your combined sales tax rate. Choose whether the amount already includes tax.
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US sales tax is set by states and by many counties and cities, so the right rate depends on where the sale is sourced. Enter your combined rate. Look it up with your state revenue department or a tax adviser, because rates and rules change.
Tax = price × rate ÷ 100. Total = price + tax. At 8% a $100 item totals $108.
Pre-tax price = total ÷ (1 + rate ÷ 100). A $108 total at 8% is $100 plus $8 tax.
Since the 2018 Wayfair decision, states can require out-of-state sellers to collect tax once they pass an economic nexus threshold. Thresholds vary by state, so check each state where you sell.