GST / Sales Tax Calculator
Add or remove tax from any price
Tax rates, exemption thresholds, reverse-charge rules and rounding conventions differ by country and by transaction type. This performs arithmetic on a rate you supply; it does not know which rate applies to your situation and is not tax advice. Confirm the correct rate and treatment with a qualified accountant or your tax authority before invoicing or filing.
Pick a direction and the tool does that side of the tax line correctly, which is the part people get wrong by hand. Adding tax is straightforward: net plus net times the rate. Removing it is not the mirror image — a gross total includes the tax already, so the net is the gross divided by one plus the rate, not the gross minus the gross times the rate. A hundred and twenty including twenty percent tax is a hundred net and twenty of tax, and reading it as eighty of tax would be a five-figure error on an invoice. Both directions report the tax as its own line so you can check the arithmetic against what a supplier or receipt actually says. The rate is whatever you type: this has no table of statutory rates by country.
Add GST/VAT/sales tax to a net price or extract it from a gross price, for any rate. Shows the tax component clearly — useful for invoices, receipts and pricing.
Private GST / Sales Tax Calculator In Your Browser
GST / Sales Tax Calculator is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.
How to use GST / Sales Tax Calculator
Enter the figure you have in the Amount field — net or gross, depending on what the invoice shows.
Type the rate as a percentage, for example 20 or 5 or 7.5.
Set Direction to `Add tax to net price` or `Extract tax from gross price`.
Read the net, the tax component and the gross; in extract mode the net figure is highlighted because it is the one you usually need.
- Extract mode uses division by one plus the rate, which is the only correct way to remove tax already embedded in a gross figure.
- The tax component is reported as its own row in both directions, so it can be compared against a line on a real invoice.
- A single rate field accepts any percentage, covering VAT, GST, sales tax and local levies without a lookup table.
- Amounts are formatted as US dollars; the arithmetic is unit-agnostic but the displayed currency symbol is not.
- A freelancer quotes a client a net fee and needs to show the VAT-inclusive figure on the invoice.
- An accountant checks that a supplier's gross invoice reconciles to the expected net charge at the applicable rate.
- A shopper comparing two quoted prices works out whether one was quoted net and the other gross.