Sales Tax / VAT / GST Calculator
Add or remove sales tax, VAT, or GST for India, US, Canada, UK, and Europe.
About this tool
Tax calculations are country-specific and easy to get wrong. Whether you need to add 18% GST to an Indian invoice, remove 20% UK VAT from a receipt, or calculate US sales tax, this tool handles the math in both directions.
How the Sales Tax / VAT / GST Calculator works
The Sales Tax / VAT / GST Calculator adds or removes tax from an amount. It is country-aware, using local tax names (GST, Sales Tax, VAT) and currencies. Choose 'Add Tax' mode to add tax to a net amount, or 'Remove Tax' mode to extract the pre-tax base from a tax-inclusive total.
How to use this tool
- Select your country — this sets the tax name and currency symbol.
- Enter the amount you want to calculate tax for.
- Enter the applicable tax rate percentage (e.g., 18 for India GST, 20 for UK VAT).
- Choose the mode: 'Add Tax' (add to net amount) or 'Remove Tax' (extract from gross amount).
- Click 'Calculate' to see the net amount, tax amount, and gross total.
Common use cases
Adding 18% GST to an invoice subtotal for billing
Extracting the pre-tax amount from a tax-inclusive receipt
Comparing final prices across countries with different tax rates
Verifying that tax has been correctly calculated on a purchase
Examples
- Adding 18% GST to ₹10,000: tax = ₹1,800, total = ₹11,800. Removing 18% from ₹11,800: net = ₹10,000, tax = ₹1,800.
- Adding 20% UK VAT to £100: tax = £20, total = £120. Removing 20% from £120: net = £100, tax = £20.
Tips & best practices
- Use 'Remove Tax' mode when you have a tax-inclusive total and need to know the pre-tax base — common for expense reports and accounting.
- Tax rates vary significantly. India GST: 5-28%, US Sales Tax: state-dependent (avg 6-9%), UK VAT: 20%, EU VAT: 17-27%, Canada GST/HST: 5-15%.
- For India: intra-state sales show CGST + SGST separately (each half the rate). Inter-state sales show IGST (full rate). The total tax is the same.
- Double-check the applicable rate for your specific product or service category — not all goods fall under the standard rate.
Common mistakes to avoid
❌ Applying a single GST rate to all goods — multiple rate slabs exist (5%, 12%, 18%, 28%) depending on the item category.
❌ Forgetting that the 'Remove Tax' formula uses division, not multiplication. Net = Gross ÷ (1 + Rate%).
❌ Confusing tax-inclusive and tax-exclusive pricing — always clarify which is being quoted.
Frequently Asked Questions
Can I remove tax from a tax-inclusive amount?
Yes. Select 'Remove Tax' mode and the tool reverse-calculates the base amount and tax portion from your total.
Does it show both net and tax amounts?
Yes. Results display the pre-tax base amount, the tax amount, and the final gross total.
What is the difference between tax-inclusive and tax-exclusive?
Tax-inclusive means the tax is already included in the displayed price (common in India, UK, EU). Tax-exclusive means tax is added at checkout (common in US, Canada).
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