Tax · United States
US Sales Tax Calculator
Enter a sale amount and a state or combined sales tax rate. This tool adds tax to a pre-tax amount, or extracts tax from a tax-inclusive total. Sales tax rates change; confirm the current rate from your state's Department of Revenue.
Sales tax rates change by state, county, and city. Enter your combined destination rate.
Inputs
Result
- Pre-tax
- $100.00
- Sales tax (8.25%)
- $8.25
- Total
- $108.25
Method
Add: Tax = Amount × Rate ÷ 100. Extract: Pre-tax = Total ÷ (1 + Rate ÷ 100).
Frequently asked questions
Do I need to collect sales tax in every state?
Only where you have nexus — physical presence, employees, inventory, or economic nexus above a state's threshold. Rules vary by state.
Is Marketplace Facilitator tax my responsibility?
Marketplaces like Amazon, Walmart, Etsy, and eBay collect and remit sales tax on your behalf in most states — but you may still need to register. Check with your state.
Method and guidance reviewed by the AIFlowBiz Editorial Team.
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Related reading
Educational tool. Not financial, tax, or legal advice. Confirm current marketplace fees and tax rates from official sources.