Reverse Tax Calculation Formula For Excel


When it comes to managing finances and making accurate calculations, Excel is a powerful tool that many individuals and businesses rely on. One common task is calculating reverse sales tax, which involves determining the original sale amount before tax. In this article, we will guide you through the process of calculating reverse sales tax using Excel, providing step-by-step instructions and helpful tips along the way.

Understanding Reverse Sales Tax Calculation:

Before diving into the Excel implementation, it’s crucial to grasp the concept of reverse sales tax calculation. Unlike regular sales tax calculation, which determines the tax amount based on the sale price, reverse sales tax calculation helps determine the original sale amount by subtracting the tax from the total price.

Setting Up Your Excel Spreadsheet:

To get started, open a new Excel spreadsheet and create the necessary columns for input and calculation. You might want to label the columns as “Total Price,” “Tax Rate,” “Reverse Sales Tax,” and “Original Sale Amount” for clarity.

Entering the Sales Amount:

In the “Total Price” column, enter the total amount paid for the purchase, including the tax. For example, let’s consider a scenario where you purchased a laptop for $1,500, and the tax rate is 8%. Enter $1,500 in the corresponding cell.

Determining the Tax Rate:

Next, determine the tax rate applicable to the purchase. This rate can vary based on your location and the type of product or service. For our example, the tax rate is 8%.

Calculating the Reverse Sales Tax:

Now comes the crucial step of calculating the reverse sales tax. In the “Reverse Sales Tax” column, use the following formula:

=Total Price / (1 + (Tax Rate / 100))
Applying this formula to our example, the calculation would be:
=1500 / (1 + (8 / 100))
Simplifying the formula:
=1500 / 1.08

The result is $1,388.89, which represents the original sale amount before tax.

Formatting the Result:

To ensure the result is formatted correctly, consider applying the appropriate formatting to the “Reverse Sales Tax” column. You may choose to display the result as a currency value or with a specific number of decimal places, depending on your preference and requirements.

Using the Reverse Sales Tax Calculator:

While manual calculations in Excel can be effective, using a dedicated reverse sales tax calculator can simplify the process further. These calculators often come with user-friendly interfaces, allowing you to enter the total price and tax rate and instantly obtain the original sale amount. Let’s say you prefer using an online reverse sales tax calculator. You would enter the total price of $1,500 and the tax rate of 8%, and the calculator would provide the reverse sales tax amount of $1,388.89.

Tips and Best Practices:

  • Double-check your data: Always verify the accuracy of the total price and tax rate to ensure precise calculations.
  • Save your spreadsheet: It’s a good practice to save your Excel spreadsheet after completing the reverse sales tax calculations. This way, you can refer to it in the future or modify it as needed.
  • Consider automation: If you frequently deal with reverse sales tax calculations, you might explore automating the process using Excel macros or other tools to enhance efficiency.


Calculating reverse sales tax in Excel can be a straightforward process when following the right steps. By understanding the fundamentals, setting up your spreadsheet correctly, and using the appropriate formulas, you can determine the original sale amount accurately. Remember to double-check your data and consider leveraging dedicated reverse sales tax calculators to streamline the process further.

Frequently Asked Questions

Q1: Can I use Excel to calculate reverse sales tax for international transactions?

Yes, Excel can be used for reverse sales tax calculations regardless of whether the transaction is domestic or international. However, ensure you have the correct tax rates for the specific location.

Q2: Is there a specific version of Excel required for reverse sales tax calculations?

No, reverse sales tax calculations can be performed using various versions of Excel, including Excel 2010, Excel 2013, Excel 2016, and newer versions.

Q3: Can I calculate reverse sales tax for multiple items in Excel?

Absolutely! You can extend the calculations to multiple rows in your spreadsheet, allowing you to calculate reverse sales tax for various items or transactions.

Q4: Are there any Excel templates available for reverse sales tax calculations?

Yes, you can find pre-designed Excel templates for reverse sales tax calculations online. These templates can save you time and effort in setting up your spreadsheet.

Q5: Can I use Excel on mobile devices to calculate reverse sales tax?

Yes, Excel is available on mobile devices, including smartphones and tablets. You can perform reverse sales tax calculations on the go using the Excel mobile app.


Benjamin Anderson

I am a distinguished sales tax expert named Benjamin Anderson. I have Bachelor's degree in Accounting. Throughout my career, I have acquired extensive expertise and built a remarkable track record in the field.

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