tax = net × rate/100, gross = net + tax. Remove-tax mode: net = gross / (1 + rate/100), tax is the difference. Figures follow the rate you entered — not tax advice and not a filing calculator.
Two independent modes cover both directions of a sales tax calculation. Add-tax mode starts from a net (pre-tax) price and works out the tax and gross (final) price: tax = net × rate/100, gross = net + tax. Remove-tax mode starts from a gross price you already have and backs out the tax: net = gross / (1 + rate/100), with the tax being the difference between the two.
The tax rate is whatever you type in — this covers VAT, GST, and sales tax at any percentage used anywhere in the world, since rates and rules differ by country, and even by region or product category within some countries.
This calculates the arithmetic only. It doesn't know your jurisdiction's actual rate, exemptions, or which goods and services the tax applies to — check your local tax rate separately and treat this as a quick math tool, not tax advice or a filing calculator.
Add-tax mode assumes your price doesn't include tax yet and calculates what the tax and final price will be. Remove-tax mode assumes your price already includes tax and works backward to show the pre-tax price and the tax amount hidden inside it.
Whatever your local sales tax, VAT, or GST rate is — the calculator doesn't assume any country's rate, since these vary a lot. Check your own jurisdiction's current rate before relying on the result.
No — this is only for tax added to the price of goods and services (sales tax, VAT, GST). For income tax and payslip deductions, use the Take-Home Pay Calculator instead.
No. It's a quick calculator for working out tax on a price, not a filing tool or accounting software — it doesn't apply exemptions, thresholds, or category-specific rules that a real tax return would need.