# Sales Tax Calculator

> Add sales tax or find the pre-tax price from a tax-inclusive total.

Page: https://freecalculator.tech/tools/sales-tax-calculator

## How do I add or remove sales tax from a price?

To add tax, multiply the net price by one plus the rate; to remove it, divide the gross price by one plus the rate.

## Formula

Added tax = pre-tax amount × rate ÷ 100. Reverse tax divides the inclusive total by (1 + rate ÷ 100).

- Added tax = pre-tax amount × rate ÷ 100. Reverse tax divides the inclusive total by (1 + rate ÷ 100).
- Inputs used: Calculation, Amount, Sales tax rate.
- Edge handling: Amount is required.; Amount cannot be negative.; Amount must be no more than 1000000000000.; Sales tax rate is required.; Sales tax rate cannot be negative..

## Inputs

- Calculation
- Amount
- Sales tax rate

## Worked example: Add 8.25% tax to $100

Tax is $8.25 and the total is $108.25.
1. Start with Calculation: add, Amount: 100, Sales tax rate: 8.25.
2. Apply the method: Added tax = pre-tax amount × rate ÷ 100. Reverse tax divides the inclusive total by (1 + rate ÷ 100).
3. Tax is $8.25 and the total is $108.25.

## Common questions

### How do I add or remove sales tax from a price?

To add tax, multiply the net price by one plus the rate; to remove it, divide the gross price by one plus the rate. Check the formula, example, and limitations on this page before using the result for a real finance decision.

### Does this know my local tax rate?

No. Enter the applicable combined rate for your location.

### Why is reverse tax not simple subtraction?

Because the tax percentage is based on the pre-tax price, not the inclusive total. Check the formula, example, and limitations on this page before using the result for a real finance decision.

### Is this an income tax calculator?

No. This tax calculator handles sales tax, VAT and GST on a price. Income tax depends on country-specific brackets and deductions, which this page does not model.

### How do I use the Sales Tax Calculator?

Enter the required values for Calculation, Amount, Sales tax rate. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Sales Tax Calculator use?

Added tax = pre-tax amount × rate ÷ 100. Reverse tax divides the inclusive total by (1 + rate ÷ 100). The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this sales tax calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Cite this page

- APA: Free Calculator. (n.d.). Sales Tax Calculator. https://freecalculator.tech/tools/sales-tax-calculator
- MLA: "Sales Tax Calculator." Free Calculator, https://freecalculator.tech/tools/sales-tax-calculator.
- Link: Sales Tax Calculator — Free Calculator, https://freecalculator.tech/tools/sales-tax-calculator