How to find original price before tax formula?

Asked by: Isidro Gutmann  |  Last update: June 18, 2026
Score: 4.6/5 (52 votes)

To find the original price before tax, divide the total price (including tax) by 1 + tax rate 1 + t a x r a t e (in decimal form). Original Price = Total Price ( 1 + Tax Rate ) O r i g i n a l P r i c e = T o t a l P r i c e ( 1 + T a x R a t e )

How do you find the original price before tax?

To calculate the price before tax (reverse sales tax), divide the total price by (1 + the tax rate as a decimal); for example, if the total is $107 and the tax rate is 7% (0.07), you'd calculate $107 / 1.07 to get the $100 pre-tax price. 

How to find the original price before GST?

For example, if the cost of a product after GST of 18% is Rs. 118, its original cost is 118 – [100/(100 + 18%)}], which equates to Rs. 100.

How to work out the original price before VAT?

To remove Value Added Tax or to make a reverse VAT calculation the formula is the following: Net: (Amount / 120) * 100 Easy! Divide the amount by 100 + VAT% and then multiply by 100. That's the amount excluding VAT taxes (Net amount).

How to find original price after 20% off?

How do I find the original price?

  1. Divide the discount percentage by 100 to convert it to a decimal fraction: 20% / 100 = 0.2.
  2. Subtract this fraction from 1: 1 - 0.2 = 0.8 .
  3. Divide the post-sale price by this new number: $80 / 0.8 = $100 .
  4. Marvel at what you could have been paying!

How to Find Original Price: Tax 1

30 related questions found

What is a reverse tax calculator?

A Reverse Sales Tax Calculator is a tool that removes the sales tax portion from a total amount to reveal the original price before tax. Unlike a standard sales tax calculator that adds tax to a price, a reverse calculator works backward to separate the base price from the tax portion.

What is the formula to find original value?

Therefore, our percentage is 20% and we can write . Step 2: Next, we must convert to a decimal. To do this, we divide by 100%. Step 3: Since we are dealing with a percent increase, we use the formula x = ( 1 + p ) x o to find the original value.

How to find out percentage backwards?

To do reverse percentages, find the original amount by first determining what percentage the given number represents (e.g., 100% - 20% discount = 80%), then divide the given number by that percentage to find 1%, and finally multiply by 100 to get the original total, or use the multiplier method: divide the final value by its decimal multiplier (e.g., 0.80 for an 80% value). 

How to calculate GST in reverse?

Reverse Charge Mechanism & Calculation

  1. Formula: Base Amount = Inclusive Amount ÷ (1 + GST Rate/100)
  2. RCM: Recipient pays GST instead of supplier.
  3. Split: For intra-state: CGST + SGST | For inter-state: IGST. Our reverse GST calculator automatically handles RCM compliance calculations.

How to figure out hst backwards?

Reverse Sales Tax Calculations:

  1. Price before Tax = Total Price with Tax - Sales Tax.
  2. Sales Tax Rate = Sales Tax Percent / 100.
  3. Price before Tax = Total Price with Tax / (1 + Sales Tax Rate)
  4. Sales Tax = Price before Tax x Sales Tax Rate.

How to find original price before tax in Excel?

Price Before Tax = Total Price / (1 + Sales Tax Rate)

Where Total Price is the cell with the price inclusive of tax, and Sales Tax Rate is the cell with the tax rate expressed as a decimal. In Excel, you would input these formulas into the cells where you want to display the tax amount and the price before tax.

How do I find the original price before GST?

Subtracting GST:

To calculate how much GST is included in a price, just divide by 11. To calculate how much the price was before GST, just divide by 1.1. That's a lot of manual work for small-business owners to do every time they want o calculate GST—use our calculator instead.

Is a reverse GST calculator accurate?

Calculating reverse GST is important because it allows you to determine the GST-exclusive price from a GST-inclusive amount and arrive at an accurate tax amount.

How to find the original cost price?

Commonly used formulas include:

  1. Cost Price (CP) = Selling Price (SP) - Profit.
  2. CP = Selling Price (SP) + Loss.
  3. If percentage profit or loss is given: CP = [100 / (100 + Profit%)] × SP. CP = [100 / (100 - Loss%)] × SP.

How do I calculate the original price?

Step 1: Convert the percent discount to a decimal by dividing by . Step 2: Set up the equation P = ( 1 − d ) x to find the original price of the item where is the sale price, is the discount as a decimal, and is the original price of the item.

How do you reverse 20% off?

Calculating reverse percentages

  1. The original price of the top is unknown, but no matter what this price was, this is 100% of the value. The shop has then reduced prices by 20%. ...
  2. Multiply both sides by 100 to get 100%:
  3. £ 30 − 20 % = £ 30 − £ 6 = £ 24.

How to calculate original price after tax?

Sales Tax Calculation Formulas

  1. Sales tax amount = original price × sales tax rate as a decimal.
  2. Sales tax rate as a decimal = sales tax percent / 100.
  3. Total price after tax:
  4. Original price before tax = total price after tax / (1 + sales tax rate as a decimal)
  5. Sales tax amount = total price after tax - price before tax.

How to find original price after percentage decrease?

For example, if you have to work out the original price of a laptop that is being sold at 25% off:

  1. work out the current price as a percentage of the original price (100%): current price is 100% - 25%
  2. Find 1% by dividing the current price by 75.
  3. Multiply this 1% by 100 to find the original price (100%)

How do you reverse 20%?

Finding the Reverse Percentage of a number in 3 easy steps.

Step 1) Get the percentage of the original number. If the percentage is an increase then add it to 100, if it is a decrease then subtract it from 100. Step 3) Find 100% of the original number by multiplying the result from Step 2) by 100.

How to reverse tax calculation?

Answer: Reverse sales ' is the process of determining the pre-' amount from a total price that includes sales '. It is calculated by dividing the total amount by (1 + sales ' rate). For example, if the total amount is $107.50 and the sales ' rate is 7.5%, the pre-' amount is calculated as $107.50 / 1.075 ≈ $100.

How to reverse 20% tax?

Subtracting VAT from a Price

  1. If you know the VAT rate, divide the gross amount by (1 + VAT Rate).
  2. Formula: Net Amount = Gross Amount / (1 + VAT Rate).
  3. Example: If the gross amount is £120 and the VAT rate is 20%, then Net Amount = £120 / 1.20 = £100.

How do I calculate percentage backwards?

To do reverse percentages, find the original amount by first determining what percentage the given number represents (e.g., 100% - 20% discount = 80%), then divide the given number by that percentage to find 1%, and finally multiply by 100 to get the original total, or use the multiplier method: divide the final value by its decimal multiplier (e.g., 0.80 for an 80% value).