Reverse Sales Tax Calculator

Reverse Sales Tax Calculator:

This reverse sales tax calculator instantly calculates the original price before tax and the sales tax amount from a total price that already includes sales tax. It works backward from a tax-inclusive price, making it easy to determine how much of the total is the product's original price and how much is sales tax.

How to Use the Reverse Sales Tax Calculator?

Step 1: Enter the total amount paid

Explain:

Input the final price, including sales tax.

Step 2: Enter the sales tax percentage

Example:

If your receipt shows an 8% sales tax, enter 8.

Step 3: Click “Calculate” & View the price before tax

Explain:

Our reverse tax calculator separates the tax from the total amount and shows the original price.

Need to add sales tax instead of removing it? Try our Sales Tax Calculator to quickly calculate the final price after tax.

Reverse Sales Tax Formula:

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

How to Calculate Tax from Total Amount?

To find the pre-tax amount from a tax-inclusive total, use the following reverse sales tax formula:

Example #1:

Given:

Total Price (Including Tax): $108
Sales Tax Rate: 8%

Step 1: Calculate the Original Price

Formula:

Original Price = Total Price ÷ (1 + Sales Tax Rate ÷ 100)

Calculation:

Original Price = $108 ÷ (1 + 8 ÷ 100)
Original Price = $108 ÷ 1.08
Original Price = $100

Step 2: Calculate the Sales Tax

Formula:

Sales Tax = Total Price − Original Price

Calculation:

Sales Tax = $108 − $100
Sales Tax = $8

Result:

Original Price (Before Tax): $100
Sales Tax: $8
Total Price (Including Tax): $108

Example #2: Reverse Sales Tax at Different Tax Rates

Total Price (Including Tax)	Sales Tax Rate	Original Price (Before Tax)	Sales Tax
$100.00	5%	$95.24	$4.76
$100.00	8%	$92.59	$7.41
$100.00	10%	$90.91	$9.09

How to Find Sales Tax Rate From a Total Price?

If you know the pre-tax amount and the tax amount, you can easily determine the sales tax rate using the following formula:

Formula:

Sales Tax Rate = (Sales Tax Amount ÷ Original Price) × 100

Example:

Given:

Original Price: $100
Sales Tax Amount: $8

Step 1: Divide the sales tax amount by the original price

Sales Tax Rate = $8 ÷ $100 = 0.08

Step 2: Convert the decimal to a percentage

0.08 × 100 = 8%

Result:

Sales Tax Rate = 8%

Sales Tax vs Reverse Sales Tax: What's the Difference?

Normal Sales Tax	Reverse Sales Tax
Starts with pre tax price	Starts with final price
Adds tax	Removes tax
Used at checkout	Used for receipts/invoices

What Are Net and Gross Prices?

The net price is the original price before the addition of the tax, while the gross price is the amount the customer pays after the addition of tax. Formulas include:

Gross Price = Net Price + Sales Tax Amount

Gross Price = Net Price × (1 + (Sales Tax Rate ÷ 100))

Net Price = Gross Price ÷ (1 + (Sales Tax Rate ÷ 100))

What Is Sales Tax?

Sales tax is a government-imposed tax on the sale of goods and services. This amount is added to the purchase price. Retailers collect it at the point of sale and remit it to the tax authorities.

Common Reverse Sales Tax Mistakes:

Mistake 1: Directly subtracting the tax percentage

Wrong:

$108 - 8% = $99.36

Correct:

$108 ÷ 1.08 = $100

Mistake 2: Using incorrect tax rate in calculations

Explain:

In some places, sales tax consists of multiple taxes. Using one rate will produce inaccurate results. So you must use the combined sales tax rate

Mistake 3: Using a tax-exclusive amount

Clarify:

Using the final amount after tax

Sales Tax Calculator Features:

Fast calculations
Free to use
Reverse tax calculation
Tax breakdown
Decimal support
Mobile-friendly
Supports large numbers, including scientific notation when needed.

This Reverse Sales Tax Calculator is useful for retailers who need to find the original price before sales tax. It also works well with our Margin Calculator, and Profit Calculator to help set the right selling price and estimate profit more accurately.

FAQ’s:

Can I calculate tax backwards from a receipt?

Yes. If your receipt shows the total price (including tax) and you know the sales tax rate(%). Simply enter these values into our reverse sales tax calculator, it will instantly calculate the original amount before tax and the sales tax amount.

Can I use decimals in the calculator?

Yes, our reverse tax calculator accepts decimal values.

Does this calculator work for VAT or GST?

Yes, you can use the tax reverse calculator for VAT (Value Added Tax) and GST (Goods and Services Tax) by providing the total price including the tax and the applicable tax rate(%).

How Do I Calculate Sales Tax Backwards?

If you know the final total amount and the tax percentage, then follow these steps to calculate the tax:

Find the Pre-Tax Price:
1. Divide the total price by 1 plus the tax rate (as a decimal)
2. Formula: Total Price / (1 + Tax Rate) = Pre-Tax Price
Find the Sales Tax Amount:
1. Subtract the pre-tax price from the total price
2. Formula: Total Price - Pre-Tax Price = Sales Tax

US State & Local Sales Tax Rates:

Sales tax rates vary across states. The table below reflects rates as of July 1, 2023.

State	State Tax Rate	Rank	Avg. Local Tax Rate	Combined Rate	Rank	Max Local Tax Rate
Alabama	4.00%	40	5.237%	9.237%	5	7.50%
Alaska	0.00%	46	1.813%	1.813%	46	7.50%
Arizona	5.60%	28	2.771%	8.371%	11	5.30%
Arkansas	6.50%	9	2.943%	9.443%	3	6.13%
California (a)	7.25%	1	1.601%	8.851%	7	4.75%
Colorado	2.90%	45	4.891%	7.791%	15	8.30%
Connecticut	6.35%	12	0.000%	6.350%	33	0.00%
Delaware	0.00%	46	0.000%	0.000%	47	0.00%
Florida	6.00%	17	1.019%	7.019%	24	2.00%
Wisconsin	5.00%	32	0.429%	5.429%	44	1.75%
Wyoming	4.00%	40	1.441%	5.441%	43	2.00%
D.C.	6.00%		0.000%	6.000%		0.000%

References:

From Taxfoundation.org: Reverse Sales Tax & Combined Rates
From Wikipedia.org: US Sales Tax Overview & Taxable Items