Reverse Sales Tax Calculator

  • Enter the total amount (including tax) in the "Total Amount" field.
  • Enter the tax rate (in percentage) in the "Tax Rate" field.
  • Click the "Calculate" button to calculate the sales amount before tax.
  • The result will be displayed as a bar chart and detailed calculation below.
  • Use the "Clear" button to reset the inputs, and "Copy" to copy the results to the clipboard.
Sales Amount (before tax)
Detailed Calculation
Calculation History


    The Reverse Sales Tax Calculator is a valuable tool that aids individuals and businesses in calculating the original price of a product or service before the sales tax was applied. This tool is particularly useful for those who need to reverse calculate sales tax to ensure accurate reimbursement, pricing, or budgeting.


    The concept behind the Reverse Sales Tax Calculator is straightforward: it allows users to determine the pre-tax price of an item or service when they know the final price, which includes the sales tax. This tool is especially beneficial when users want to:

    1. Reimburse sales tax: Businesses need to reimburse employees or customers for sales tax on purchases. This tool helps them accurately calculate the pre-tax amount to be reimbursed.
    2. Price adjustments: Retailers and sellers can use this calculator to set prices that include the desired profit margin after accounting for sales tax.
    3. Budgeting and financial planning: Individuals and businesses can better plan their finances by knowing the original cost of an item, helping with budgeting and decision-making.


    The Reverse Sales Tax Calculator relies on simple mathematical formulae to calculate the original price (pre-tax) based on the final price (post-tax) and the applicable sales tax rate. Here are the essential formulae:

    Formula 1: Pre-tax Price Calculation

    The pre-tax price (P) can be calculated using the following formula:

    P = F / (1 + (R / 100))


    • P represents the pre-tax price.
    • F is the final price, which includes the sales tax.
    • R is the sales tax rate (in percentage).

    Example Calculations

    Let’s explore a few example calculations to illustrate the use of the Reverse Sales Tax Calculator.

    Example 1: Reimbursing Sales Tax

    Suppose an employee made a purchase of $120, which includes a 10% sales tax. To calculate the pre-tax amount for reimbursement:

    P = 120 / (1 + (10 / 100)) P = 120 / (1 + 0.10) P = 120 / 1.10 P ≈ $109.09

    In this case, the pre-tax price is approximately $109.09, which can be reimbursed to the employee.

    Example 2: Setting Retail Price

    A retailer wants to price a product to ensure a 25% profit margin after applying a 7% sales tax. To determine the pre-tax price for pricing purposes:

    P = F / (1 + (R / 100)) P = X / (1 + (7 / 100)) P = X / (1 + 0.07) P = X / 1.07

    To achieve a 25% profit margin, the retailer can use the following formula:

    Selling Price (SP) = Cost Price (CP) + Profit (P)

    Substituting the values:

    SP = X + (0.25 * X) SP = X + 0.25X SP = 1.25X

    Now, equate the selling price to the pre-tax price:

    1.25X = X / 1.07

    Solving for X:

    X = (1.25 * X) / 1.07 X = 1.25X / 1.07 X ≈ $116.82

    In this case, the retailer should price the product at approximately $116.82 to achieve a 25% profit margin after accounting for the 7% sales tax.

    Real-World Use Cases

    The Reverse Sales Tax Calculator finds application in various real-world scenarios:

    Business Expense Reimbursement

    Businesses reimburse employees for purchases that include sales tax. This tool ensures accurate reimbursements, eliminating the risk of over or underpayment.

    Retail Pricing

    Retailers can determine optimal pre-tax prices to maintain desired profit margins after factoring in sales tax, ensuring competitive pricing while safeguarding profitability.

    Financial Planning

    Individuals and businesses can use the tool for budgeting and financial planning, helping them make informed decisions about their expenses.

    Contract Bidding

    In industries where contracts are awarded based on competitive bidding, understanding the true pre-tax cost of goods or services is crucial for preparing competitive bids.


    The Reverse Sales Tax Calculator simplifies the process of determining the pre-tax price of products or services when the final price includes sales tax. It relies on a straightforward formula and offers practical solutions for businesses and individuals in various scenarios. Whether it’s for accurate reimbursement, pricing strategy, or financial planning, this tool is an invaluable resource in managing finances effectively.


    1. Dubey, A. K., & Singh, R. (2018). Impact of Sales Tax on Pricing Strategy: A Case Study of Retail Industry. International Journal of Business and Management, 13(10), 1-11.
    2. Lee, H., & Kim, J. (2017). Determining the Optimal Pricing Strategy for Retailers Considering Sales Tax. International Journal of Economics, Commerce, and Management, 5(6), 52-60.
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