About the Sales Tax Calculator
Sales tax in the US is added at the register — unlike VAT, it is not baked into advertised prices. Rates vary from 0% in several states to over 9% in some California cities, and the actual rate on a receipt is often state + county + city layered together.
This tool computes the tax on a price and the total to expect at the register — and does the reverse calculation (tax-inclusive totals back to the pre-tax figure) for bookkeeping comparison against a receipt.
The formula behind it
Retail sales tax at the point of purchase:
Tax = price × rate • Total = price × (1 + rate) • Reverse: pre-tax = total / (1 + rate)Each state sets its own base rate; local jurisdictions add on top. US sales tax is always on the final pre-tax price — only “tax-inclusive” markets (like the reverse of VAT) work the other way.
Worked example
Defaults — an $84.99 item at a 7% rate:
- Tax = $84.99 × 0.07 = $5.95.
- Total at the register = $90.94.
- Reversed: a receipt total of $90.94 at 7% → $84.99 pre-tax, $5.95 tax.
Takeaway: On a basket of goods, sales tax at 7% adds slightly more than one item per 14 — a modest, but real, annual amount for any mid-size shopping budget.
What moves the result
- State rate — the widest band: 0% (e.g., NH monthly single sellers; OR, MT, DE still basically exempt) to 7.25% CA, several near 9.5%.
- Local add-ons — many city/county overlays mean the total rate printed on your receipt matters, not the state base.
- Exemptions — many states exempt groceries, prescription drugs or clothing partially for most purchases.
- Online purchases — post-South Dakota v. Wayfair, most major online sellers also collect sales tax by state.
Practical tips
- Reconstruct a receipt total with this tool to verify a store computed the tax correctly; the reverse calculation is usually within pennies.
- For online sellers: uniform use of buyer zip-code tax facts (often done via zip-level services) is not handled here — use the registered rate band.
- Check the state-specific rules before precomputing — several states bundle taxes combined into a single local rate.
- For businesses: inventory and remittance rules depend on your nexus; the tool is for point-of-sale math, not nexus determination.
- If you are buying something large, compare pre-tax totals before belief — a tax difference on $5,000 of furniture is significant.
Frequently asked questions
What is the highest combined sales tax in the US?
Combined state+local rates exceed 9.5% in some cities in California and Washington (e.g., LA and Seattle). 总 rates printed on a physical receipt are the exact ones that matter.
Do online purchases carry sales tax?
In most cases yes, since the Supreme Court’s South Dakota v. Wayfair decision: major online sellers collect by buyer’s state, exactly including the tax in the sticker at checkout.
How is US sales tax different from VAT?
Sales tax is collected once at the point of sale to the consumer; VAT is charged at every stage with credits. Different math, different bookkeeping behaviors.