Reverse Sales Tax Calculator

Have you ever had a receipt with only the final total and wanted to know how much of that amount was sales tax? Whether you're a business owner, accountant, or curious shopper, knowing how to calculate sales tax backwards can be very useful. That's where our Reverse Sales Tax Calculator comes in. It helps you instantly find the original price before tax was added simple, fast, and 100% free to use.

Whether you're in Canada, Quebec, Ontario, or any province with specific tax rates, our tool is designed to give you the pre-tax amount in seconds. No complex math, no Excel sheets just enter your total and tax rate, and get the result.

What Is a Reverse Sales Tax Calculator?

A reverse sales tax calculator is a tool that allows you to calculate the pre-tax price from a total amount that already includes sales tax. It’s the opposite of adding tax you’re removing it to find the original price.

This is especially helpful if:

• You only have the final billed amount
• You need to reconcile tax amounts for accounting
• You want to find the base price for items sold in provinces with different tax rates like Quebec (QST) or Ontario (HST)

How Does the Reverse Tax Formula Work?

To reverse calculate sales tax, you can use the following simple formula:

Original Price = Total Price / (1 + Tax Rate)

For example, if the total price is $113 and the tax rate is 13% (Ontario HST):

Original Price = 113 / (1 + 0.13) = 113 / 1.13 = $100.00

Sales Tax Amount = 113 - 100 = $13.00

This way, you break down your total and see exactly what portion went to tax.

How to Use the Reverse Sales Tax Calculator

Using our tool is very easy. Just follow these steps:

• Enter the total amount (price including tax).
• Input the tax rate (e.g., 13% for Ontario, 14.975% for Quebec).
• Click Calculate.

This calculator is especially helpful for freelancers, small business owners, and ecommerce sellers who need to calculate the base price or file taxes correctly.

Example: Reverse Sales Tax in Quebec

Let's say your receipt total is $114.98 and you know that the tax rate in Quebec is 14.975% (GST + QST).

Original Price = 114.98 / (1 + 0.14975) = 114.98 / 1.14975 = $100.00

Sales Tax = 114.98 - 100 = $14.98

So your pre-tax price was $100, and you paid $14.98 in sales tax.

Can You Use Excel for Reverse Tax Calculation?

Yes, you can! Here's the formula to use in Excel:

= Total_Amount / (1 + Tax_Rate)

For example:

=113 / (1 + 0.13)

This formula gives you the original price before tax was added. You can also calculate the tax amount by subtracting the result from the total.

Final Verdict

Calculating sales tax backwards doesn’t have to be complicated. Whether you’re in Canada, Ontario, Quebec, or anywhere else, our Reverse Sales Tax Calculator makes it effortless. With just a few inputs, you can remove the tax from any total and find the true price. No spreadsheets, no formulas, just instant results.

Perfect for reconciling invoices, checking receipts, or preparing tax returns, this tool saves time and ensures accuracy every time.

Frequently Asked Questions (FAQs)

How do you calculate sales tax backwards from a total?

Use the formula: Total Price / (1 + Tax Rate). This gives you the price before tax.

Is this calculator accurate for all Canadian provinces?

Yes, you can enter any custom tax rate, including HST, GST, or QST.

Can I use this for US sales tax too?

Absolutely. Just input the correct tax rate used in your state.

Can I use this in Excel?

Yes, use the formula =Total / (1 + Tax Rate) to calculate the pre-tax amount.

Is this tool free to use?

100% free, no registration required.

What is the reverse tax formula in Quebec?

For Quebec (14.975%), use: Total / 1.14975.