Tax calculator guide
VAT vs Sales Tax Calculator Guide
VAT and sales tax calculations often look similar, but the practical question is usually simple: add tax to a net price or remove included tax from a gross price.
Quick workflow
A simple way to do it
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1
Choose add-tax mode when you know the net price before tax.
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2
Choose remove-tax mode when the final price already includes tax.
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3
Use percentage and bill calculators for related pricing checks.
Worked example: add tax at an illustrative rate
For arithmetic practice, use net price 100 and rate 20%. Add-tax mode calculates tax as 100 × 0.20 = 20 and gross as 100 + 20 = 120. The rate here is an example, not a determination of the rate for a product or jurisdiction. Enter the applicable rate only after checking the relevant authority.
Worked example: remove included tax
For gross price 120 at the same illustrative 20% rate, remove-tax mode divides by 1.20: net = 120 ÷ 1.20 = 100 and included tax = 120 − 100 = 20. Subtracting 20% of 120 would give 96, which is wrong because the percentage applies to the net base, not the tax-inclusive total.
What the two modes actually calculate
Both modes use a single percentage on one amount. Add-tax starts from a pre-tax value; remove-tax starts from an inclusive value. The calculator rounds monetary values to two decimal places during the calculation. It does not model an invoice with independently rounded lines, multiple rates, compounding taxes, exemptions, or tax credits.
Checklist before using the result
Identify whether the source price includes tax. Confirm the rate and taxable base with the relevant tax authority, select the matching mode, and compare the net plus tax against gross. Keep currency conversion separate. For a real invoice, verify rounding and required fields against your accounting process instead of copying an estimate unchecked.
Limitations: arithmetic does not decide tax treatment
VAT and sales tax have different rules for liability, collection, and reporting. Identical percentage arithmetic does not make their legal treatment interchangeable. This tool cannot determine place of supply, registration obligations, reduced-rate eligibility, or recoverable input VAT. Use it to check a chosen scenario; seek official guidance or qualified advice for the underlying tax decision.
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