Sales Tax Calculator - Calculadora online grátis

Sales tax math is one of those things that sounds trivial until you're staring at a 47-line e-commerce invoice trying to figure out how much of the total is actually tax. Different jurisdictions apply tax differently - some add it on top of the listed price, others bake it into the displayed price (the way Indian MRPs do), and many use multiple stacked taxes that interact in surprisingly non-obvious ways. This calculator handles both directions cleanly: add tax to a pre-tax price, or extract tax from a tax-inclusive total. For Indian GST with its CGST/SGST/IGST split, use the dedicated GST calculator; this one is the generic version that works for US state taxes, VAT in Europe, sales tax in Singapore or Dubai, and any custom rate you set.

For businesses, getting sales-tax computation right is a compliance issue, not a math curiosity. An understated tax leaves you exposed to back-tax demands and penalties; an overstated tax means you've overcharged customers and need to refund. For consumers, sales-tax math is the difference between a price that fits the budget and one that pushes it over. This calculator gives you the answer in a single screen - but more importantly, it shows the breakdown so you can verify any quoted total in seconds.

The two modes are inverses of each other. Add-tax mode applies the standard markup: Final = Price × (1 + Rate/100). Remove-tax mode applies the inverse: Pre-tax = Final / (1 + Rate/100), and Tax = Final − Pre-tax. The key insight: you cannot extract tax by simply multiplying the tax-inclusive price by the tax rate. A ₹118 GST-inclusive price at 18% doesn't have ₹21.24 of tax (118 × 18%); it has ₹18 of tax (the price was originally ₹100 + ₹18 GST). The calculator handles this distinction automatically.

For multi-tax stacks (state + city + special-purpose levies), there are two conventions. The 'parallel' convention sums all rates and applies once: 6% state + 2% city = 8% applied to base price. The 'cascading' convention applies each tax sequentially on the previously-taxed amount: same rates would yield Final = Price × 1.06 × 1.02 = Price × 1.0812 - about 0.12% higher. Most modern jurisdictions use parallel; some older systems still cascade. Confirm which one your local rules use before computing.

Indian GST is technically a multi-tax stack handled in parallel: CGST + SGST = total tax for intra-state, IGST alone for inter-state. The total tax is the same; only the split changes by transaction geography. Use the GST calculator on this site for the proper split. This generic sales-tax tool is the right choice when you're not in the GST context - global commerce, jurisdictions outside India, or simply when you don't need the split.