What Is Reverse Sales Tax?
If you know the total price you paid but want to find the original price before sales tax, a reverse sales tax calculation makes the process simple. Instead of adding sales tax to a product, you work backward to separate the tax from the total amount.
This is useful when you're reviewing receipts, checking invoices, preparing business records, or simply want to know how much the item actually cost before sales tax was included.
This Reverse Sales Tax Calculator does all the math for you. Just enter your total price and sales tax rate, and you'll instantly see the original price, the sales tax amount, and additional pricing comparisons.
How to Use This Reverse Sales Tax Calculator
Follow these simple steps:
- Select your preferred currency.
- Enter the total price you paid.
- Enter your sales tax rate.
- View your original price before sales tax.
- See exactly how much sales tax was included.
- Compare your results with the tax-added and tax-removed scenarios.
Reverse Sales Tax Formula and Calculation Method
To find your original price, you divide the total price by one plus the sales tax rate expressed as a decimal.
Original Price = Total Price ÷ (1 + Sales Tax Rate)
Once you know the original price, you can calculate the sales tax by subtracting the original price from the total amount you paid.
Sales Tax = Total Price − Original Price
The calculator also shows what your total would be if sales tax were added to the original price.
Total Price = Original Price × (1 + Sales Tax Rate)
Example:
Suppose you paid $108.00 and your sales tax rate was 8%.
- Your original price is $100.00.
- Your sales tax is $8.00.
- Your total price remains $108.00.
If you need to calculate sales tax in the opposite direction, try our Sales Tax Calculator.
Why Removing Sales Tax Matters
Removing sales tax helps you find the original price before tax was added. Whether you're checking a receipt, reviewing an invoice, comparing prices, or verifying a purchase, knowing the pre-tax amount gives you a clearer understanding of what you actually paid for a product or service.
If you run a business, separating sales tax from your revenue also makes bookkeeping, expense tracking, and financial reporting more accurate. Instead of calculating the values manually, this Reverse Sales Tax Calculator instantly shows your original amount and the sales tax included in the total.
Frequently Asked Questions
Divide the total price by 1 plus the sales tax rate expressed as a decimal. This gives you the original price before sales tax. This Reverse Sales Tax Calculator performs the calculation automatically and also shows the sales tax amount.
The formula is:
Original Price = Total Price ÷ (1 + Sales Tax Rate)
For example, if the total price is $108 with an 8% sales tax rate, the original price is $100.
First calculate the original price before sales tax, then subtract it from the total price. The remaining amount is the sales tax included in your purchase. This calculator shows both values instantly.
Yes. Enter the total price and the sales tax rate, and the calculator will calculate the original price before sales tax along with the tax amount.
You may need the original price for accounting, expense reports, bookkeeping, invoice verification, or comparing prices before sales tax was added.
Yes. You can enter any sales tax rate, and the calculator will instantly calculate the original price, sales tax amount, and total price using your values.
Yes. In addition to calculating reverse sales tax, this calculator also compares what happens when sales tax is added to or removed from a price, helping you understand both scenarios.
Key Takeaways
- Find your original price before sales tax instantly.
- See exactly how much sales tax is included in your total.
- Compare prices before and after sales tax.
- Supports multiple currencies.
- Useful for receipts, invoices, bookkeeping, and business records.
- Fast, accurate, and easy to use.