Sales Tax Calculator - Add or Extract Tax & VAT

How the Sales Tax Calculator Works

1. 01Choose the mode: add tax to a net price, or extract tax from a gross, tax-inclusive total.
2. 02Enter the amount and pick a currency.
3. 03Tap a quick-rate button (5, 7.5, 8.875, 10, 20, or 21 percent) or type any custom rate.
4. 04Read the net, tax, and gross amounts side by side; the same math serves US sales tax and VAT.

Adding and Extracting Tax Without Errors

Adding tax is straightforward: multiply the net by (1 plus the rate). Extracting tax from an inclusive price is where most manual errors occur, because subtracting the percentage from the gross is wrong. The correct method divides the gross by (1 plus the rate). A 121.00 receipt at 21% VAT contains 100.00 net and 21.00 tax; subtracting 21% of 121 would give 95.59, off by more than 4%. This matters for bookkeeping, expense claims, and invoices, where the net amount is what enters the accounts and the tax is reclaimed or remitted separately. The two modes mirror two retail cultures: US sales tax is added at the register, so shelf prices are net, while VAT countries bake tax into displayed prices, so receipts must be decomposed. Rates vary widely: combined US state and local rates range from 0% in Oregon and Delaware to over 10% in parts of Louisiana; New York City is 8.875%; the UK standard VAT is 20%; the Netherlands 21%; EU standard rates run 17-27%. When invoicing across borders, confirm which rate and which regime applies before quoting, and keep net and gross clearly labeled on the document.

When to Use the Sales Tax Calculator

Use add mode when writing quotes and invoices from net prices, checking what a purchase will cost at the register in a US state, or pricing products for a tax-exclusive market. Use extract mode when reconciling receipts for bookkeeping or expense claims, splitting a VAT-inclusive total into net and tax for the accounts, or verifying that a vendor charged the correct rate. The quick-rate buttons cover the most common US and European rates.

Common Use Cases

• —Writing an invoice or quote by adding the correct tax to a net price.
• —Extracting VAT from receipts for bookkeeping and expense claims.
• —Checking the register total before buying in a US state with combined local rates.
• —Verifying a vendor applied the correct rate on a tax-inclusive bill.
• —Computing India-specific GST with the CGST/SGST split. GST Calculator - Add or Remove GST
• —Feeding net amounts into pricing and margin decisions. Profit Margin Calculator - Margin & Markup

Expert Tips

• ✻Never subtract the percentage to remove tax; always divide by (1 plus the rate), or the net will be understated.
• ✻Label net, tax, and gross explicitly on invoices; most billing disputes trace back to ambiguous tax-inclusive figures.
• ✻For US quotes, confirm the combined state plus local rate for the delivery address, not just the state rate.

Frequently Asked Questions

How do I remove tax from a tax-inclusive price?→

Divide the gross amount by (1 plus the rate as a decimal). For 121.00 at 21%: 121 / 1.21 = 100.00 net, 21.00 tax. Subtracting 21% of the gross is a common error that gives the wrong answer.

Does this work for both US sales tax and VAT?→

Yes. Both are a percentage added to the net price, so the add and extract math is identical. The difference is presentation: US shelf prices exclude tax, while VAT countries display tax-inclusive prices.

What rate should I use for my US state?→

Combined state plus local rates range from 0% (Oregon, Delaware, Montana, New Hampshire) to over 10% in some localities. The 8.875% quick button matches New York City. Check your state and city rate, then enter it as a custom value.

Why do my rounded amounts differ by a cent from a receipt?→

Merchants may round tax per line item or per invoice, and jurisdictions have different rounding rules. Differences of one cent on totals are normal and not an error in the rate.