Invoice Sales Tax Calculator
Enter the taxable subtotal and the rate that applies to your transaction. The tool calculates the sales-tax amount and total after tax.
Formula: Sales tax = taxable subtotal x tax rate. Total = taxable subtotal + sales tax.
Free · private in your browser · no signup
Enter the numbers
Calculated result
Sales tax
$99.00
8.25% of $1,200.00
Total after tax
$1,299.00
Taxable subtotal plus calculated sales tax
Formula: Sales tax = taxable subtotal x tax rate. Total = taxable subtotal + sales tax.
Use the result correctly
What the calculation means
This calculator performs arithmetic only. It does not determine whether a product, service, customer, shipping charge, or discount is taxable or which rate applies. Enter a rate you have verified for the transaction.
Useful for
- Check tax arithmetic before sending an invoice
- Calculate a customer total from a verified rate
- Separate the taxable subtotal from the sales-tax amount
Worked examples
Sales tax calculation examples
Use these examples to check the formula, then replace the figures with the real values for your transaction.
| Scenario | Input | Calculated result |
|---|---|---|
| Scenario 8.25% entered rate | Input $1,200 taxable subtotal | Calculated result $99 tax · $1,299 total |
| Scenario 6% entered rate | Input $850 taxable subtotal | Calculated result $51 tax · $901 total |
| Scenario No tax entered | Input $500 subtotal at 0% | Calculated result $0 tax · $500 total |
Frequently asked questions
Does this tool find my sales-tax rate?
No. Enter the verified rate for your transaction. Rates and sourcing can depend on state and local rules.
Are services subject to sales tax?
It depends on the service and jurisdiction. Verify with the relevant revenue authority or a qualified adviser.
Is shipping included in the taxable subtotal?
Shipping treatment varies. Include only the amount you have determined is taxable for the transaction.
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