Free Reverse Sales Tax Calculator

How to Use the Reverse Sales Tax Calculator

This quick video walkthrough shows how to back the sales tax out of a total. You will learn to enter your gross price, set the tax rate or pick a state preset, and instantly read the price before tax using our free calculator.

Free reverse sales tax calculator backing a 4% New York tax out of a 1,593.75 total to show 1,532.45 before tax and $61.30 sales tax, with a step-by-step solution

This reverse tax calculator needs just two numbers. Here is how to use it:

1. Enter the total price: This is the gross amount the customer paid, with tax already included.
2. Set the sales tax rate: Type the rate as a percent, like 6.25. You can also pick a state or province preset to fill the statewide base rate for you.
3. Adjust the rate if needed: The preset fills the base rate, but the field stays editable. Add your local city or county rate to match your real combined rate.
4. Read your results: The tool instantly shows the price before tax, the sales tax amount, and a step-by-step solution.

The Reverse Sales Tax Formula

The math for backing tax out of a total is simple. This is the reverse sales tax formula:

$$\text{Price before tax} = \frac{\text{Total}}{1 + \frac{\text{Tax rate}}{100}}$$ $$\text{Sales tax} = \text{Total} - \text{Price before tax}$$

The key step is dividing, not subtracting. A common mistake is to take the tax percent off the total directly. That gives the wrong answer because the tax was charged on the smaller pre-tax price, not the larger gross total.

Worked Example

Say a customer paid a total of $858 and your sales tax rate is 7.25%.

First convert the rate to a decimal, then divide the total by 1 plus that decimal:

$$\text{Price before tax} = \frac{858}{1 + \frac{7.25}{100}} = \frac{858}{1.0725} = 800$$

Then subtract the pre-tax price from the total to find the tax:

$$\text{Sales tax} = 858 - 800 = 58$$

So the price before tax is $800 and the sales tax is $58. As a shortcut, dividing by 1.0725 backs out a 7.25% tax in one step.

How to Calculate Tax From a Total

If you want to know how to calculate tax from total by hand, follow the same two steps. First divide the total by $1 + \text{rate}$ to get the list price. Then subtract the list price from the total to get the tax. The calculator above does this for you and shows every step in the solution panel.

Why Ecommerce Sellers Back Tax Out of Gross Sales

Online sellers often see one gross number and need to split it apart. Here is why that matters:

• Bookkeeping: Your accounting records need revenue and tax recorded separately. The reverse calculation gives you both from a single payout figure.
• Tax remittance: When you file, you owe the tax you collected, not a slice of your total sales. Backing the tax out tells you the correct amount to remit.
• Payout reconciliation: Shopify, Stripe, and PayPal often report gross totals. A reverse sales tax calculator helps you reconcile those payouts against your real product revenue.
• Pricing checks: If you sell tax-inclusive prices, this tells you the true product price hiding inside the sticker.

US State and Canada Sales Tax Rate Notes

The presets in this tool use base statewide rates in the US and combined federal plus provincial rates in Canada. Local city, county, and district taxes can push the real rate higher, so always confirm your combined rate.

• Popular US lookups include reverse sales tax calculator NJ (New Jersey 6.625%), NY (New York 4% state, often around 8% combined), CA (California 7.25%), TX (Texas 6.25%), FL (Florida 6%), and OH (Ohio 5.75%).
• Canadian sellers can pick Quebec (14.975%), British Columbia (12%), or Ontario (13% HST).

Here are the base rates behind some of the most searched presets:

Because rates change and local rates vary, treat the presets as a starting point and edit the rate field to match the exact rate on the order.

FAQ

How do I calculate sales tax from a total?

Divide the total by 1 plus the tax rate as a decimal. That gives the price before tax. Then subtract that price from the total to get the sales tax. For example, a $107 total at a 7% rate is $107 \div 1.07 = 100$ before tax, and $107 - 100 = 7$ in tax.

Is there a free reverse sales tax calculator?

Yes. This is a 100% free reverse sales tax calculator. There is no signup, no account, and no limit on how many calculations you run.

What is the reverse sales tax formula?

The formula is $\text{Price before tax} = \frac{\text{Total}}{1 + \text{Tax rate}}$. Then $\text{Sales tax} = \text{Total} - \text{Price before tax}$. You divide first, then subtract.

Why can I not just subtract the tax percent from the total?

Because the tax was applied to the smaller pre-tax price, not the larger total. Subtracting the percent from the gross total overstates the tax. Dividing by $1 + \text{rate}$ is the correct way to reverse it.

Can I use this for any state or country?

Yes. Pick a US state or Canadian province preset to fill the base rate, or type any rate manually. The tool works for any sales tax, VAT, or GST percentage you enter.

Does the calculator handle local and combined rates?

Yes. The presets load the statewide base rate, but the rate field stays editable. Enter your full combined rate, including city and county tax, for an exact result.

How do I reverse sales tax in Excel?

Use the same formula in a spreadsheet. If the total is in cell A1 and the tax rate percent is in B1, the price before tax is =A1/(1+B1/100) and the sales tax is =A1-A1/(1+B1/100). This calculator runs that reverse sales tax formula for you, so you do not need an Excel sheet at all.