Accounting Share · Profit, pricing & growth
Sales Tax and VAT Calculator
Add a user-supplied sales-tax or VAT rate to a tax-exclusive amount and separate the tax component. The calculator does not look up a legal rate.
The interactive calculator requires JavaScript. The formula and worked example below remain available.
01 / Enter your figures
Make the numbers yours.
Use one currency and consistent time periods. Amounts are shown in your input currency units; no currency conversion is performed.
02 / See the working
Your calculation
Enter your figures, then choose Calculate. Or load the worked example.
03 / Understand the method
Formula and method
Tax = Exclusive amount × Rate; Inclusive amount = Exclusive amount × (1 + Rate)
Add a user-supplied sales-tax or VAT rate to a tax-exclusive amount and separate the tax component. The calculator does not look up a legal rate.
How to use this calculator
- Collect the figures for the same entity, currency and reporting period.
- Enter each input using its label and unit. For percentages, enter 15 to mean 15%.
- Choose Calculate, inspect the breakdown and compare the result with your assumptions.
- Change one input to explore a scenario. Recalculate after edits; display rounding does not round the underlying calculation.
Inputs at a glance
- Tax-exclusive amount: A nonnegative numeric input in the units specified by the label.
- Tax rate (%): A percentage number rather than a decimal fraction.
Worked example
Follow one calculation.
- Tax-exclusive amount
- 100
- Tax rate (%)
- 15
- Calculated result
- 115
Load this example in the interactive form to inspect the intermediate amounts.
Assumptions and interpretation
Use a rate appropriate to the jurisdiction, transaction and date. This simple model omits exemptions, multiple taxes, input-credit rules and invoice rounding conventions.
The output is a model based on the figures entered. Check source records and use the accounting or contractual definitions relevant to your task before relying on a result.
Questions about this tool
What does the sales tax and vat calculation measure?
Add a user-supplied sales-tax or VAT rate to a tax-exclusive amount and separate the tax component. The calculator does not look up a legal rate.
Which assumptions can change the result?
Use a rate appropriate to the jurisdiction, transaction and date. This simple model omits exemptions, multiple taxes, input-credit rules and invoice rounding conventions.
Why can displayed totals differ slightly from my spreadsheet?
Calculations use the unrounded input values. Only the display is rounded. Use four or six decimal places to inspect small differences, and check the timing, sign conventions and rounding policy in your spreadsheet.
Reference and further learning
Financial accounting reference. These original learning examples apply the displayed formula; the reference does not certify or endorse this calculator.
Look up an accounting term · Practise with accounting questions
Formula and worked example checked 4 November 2026. Calculations run in your browser without sending the entered figures to Accounting Share. Report a calculation issue with the tool name, example inputs and expected result; avoid sharing confidential records.
