Global tool · works in every currency
Sales Tax / VAT Calculator
Add or remove sales tax, GST, or VAT from any price, for 5 major countries.
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Default inflation rate for Other: 3.0% per year, based on long-run global CPI averages data (2026). You can override it in each calculator’s advanced options. See data sources for full citations.
Methodology: Mathematical FormulasData Sources: Inflation & Tax CitationsDisclaimer: Legal Disclosures
How We Work It Out
The formula depends on the selected tax mode:
1. Add Tax Mode:
Tax Amount = Base Amount × (Tax Rate / 100)
Final Amount = Base Amount + Tax Amount
2. Remove Tax Mode:
Base Amount = Final Amount / (1 + Tax Rate / 100)
Tax Amount = Final Amount - Base Amount
Real-World Examples
Extracting 20% VAT in the UK
If you purchase a product for £240 (inclusive of 20% UK VAT), the extracted base value of the product is £200, and the VAT paid is £40.
Adding tax to a quote
Quoting a $1,000 service with 8% sales tax: the tax is $1,000 × 0.08 = $80, so the customer pays $1,080. Switch to Remove Tax mode and enter $1,080 to recover the $1,000 base and $80 tax from an inclusive figure.
Frequently Asked Questions (FAQ)
Add Tax starts from a pre-tax (base) price and computes the tax amount plus the gross price your customer pays. Remove Tax does the inverse: you enter the gross price (already inclusive of VAT/GST/sales tax) and the calculator extracts the original base cost plus the tax component. Use Add Tax when quoting; use Remove Tax when reading off an inclusive invoice or receipt.
Yes. The math matches what accounting software uses for VAT, GST and sales tax line items. It supports US sales tax, UK VAT, Australian GST, Canadian GST/HST, and Indian GST at any rate you set. For a fully compliant invoice you'll still need the legal tax number, supplier details, and itemized lines, but the tax math itself is correct.
To extract pre-tax cost, divide the final price by (1 + tax rate / 100). For example, a $120 item with 20% VAT has a base cost of $120 / 1.2 = $100, and $20 tax.
US sales tax is charged once, at the final retail sale, and the rate combines state, county, and city tax. VAT (UK, EU) and GST (Australia, India) are charged at each step of the supply chain, but businesses reclaim the tax they paid on inputs, so the end consumer effectively bears it once. Canada's HST is a 'harmonised' tax that bundles the federal GST with a provincial portion into a single rate. For a buyer reading a receipt the math is the same; the difference is how the tax is collected and remitted behind the scenes.
It depends on the system. US sales tax is generally destination-based, so the rate usually follows where the buyer takes delivery, and a business only has to collect it where it has 'nexus' (a physical or economic presence). VAT and GST rules for cross-border and digital sales have their own place-of-supply tests. Because these rules are detailed and change often, this calculator works out the tax for whatever single rate you enter rather than deciding which jurisdiction's rate applies, check local rules or an accountant for that.