How to calculate GST reversal?

Asked by: Cyril Johnson  |  Last update: July 18, 2026
Score: 4.7/5 (31 votes)

To calculate a GST reversal (finding the base price from a GST-inclusive amount), divide the total price by ( 1 + GST rate/100 ) ( 1 + G S T r a t e / 1 0 0 ) to get the base amount, then subtract this from the total, or use the formula: Base Price = GST Inclusive Amount 1 + ( GST Rate 100 ) B a s e P r i c e = G S T I n c l u s i v e A m o u n t 1 + G S T R a t e 1 0 0 .

What is the formula for reverse GST?

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 remove 18% GST from total amount?

Net price = Original cost – 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 backwards calculate 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.

What is GST reversal with an example?

The reversal is calculated using the following formula. Example: If the buyer claimed ₹50,000 as ITC on a purchase, and the supplier failed to pay GST for 2 months out of 12 months, the ITC reversal would be calculated proportionately. As a result, the buyer must reverse ₹8,333 of the claimed ITC.

Reverse Charge Mechanism (RCM) Explained with Journal Entries & GSTR Filing | GST Practical Class

41 related questions found

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.

What is the formula for removing GST?

How do you remove GST? The equation to subtract GST is slightly more complicated: First, take the GST-inclusive price and multiply that by 3. Then, divide the result by 23 and round that number to the nearest two decimal points.

How to calculate reverse tax?

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 calculate 20% backwards?

To calculate 20% backwards (find the original amount before a 20% decrease), divide the given final amount by 0.80 (which is 100% - 20%). For a 20% increase, divide the final amount by 1.20 (100% + 20%) to find the original. This method works by finding what percentage the final number represents (80% for a decrease, 120% for an increase) and then dividing to find the 100% base.

What is reverse charge in GST with example?

Example of reverse charge mechanism under GST

Suppose a GST-registered dealer buys goods worth INR 10,000 from an unregistered supplier. In this case, the dealer has to raise a self-invoice and pay INR 1,200 as GST (calculated at 12% of INR 10,000) under the reverse charge mechanism.

What is the formula for reverse tax in Excel?

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

In Excel, you would input these formulas into the cells where you want to display the tax amount and the price before tax.

When to reverse charge GST?

Reverse Charge Rules for Business-to-Business (B2B) Transactions. When intangible services are supplied by a foreign provider to an Australian business (rather than a consumer), GST may not be charged by the overseas supplier. Instead, the reverse charge mechanism applies.

How do you reverse GST in Excel?

How can I calculate Reverse GST using Excel? In Excel, you can calculate the base price using: =Total Price / (1 + GST Rate/100) . To get the GST amount, subtract the base price from the total price. Create columns for GST rate, total price, base price, and GST amount to automate the process.

Can we reverse GST?

The Reverse GST mechanism is a process where a recipient becomes liable to pay tax on the goods and services, unlike the general case where a supplier has to bear the payment. Under this mechanism, the Government imposes the burden of making the tax payments on a recipient to exempt a few specific classes of suppliers.

How to do a reverse GST calculation?

So, if the final price of a good is ₹1000 and GST is charged at 18%, then the base price before GST will be: ₹1000 / (1 + 0.18) = ₹1000 / 1.18 = ₹847.46 (round off) and the total GST charged is ₹152.54.

How to calculate GST refund amount?

Maximum Refund Amount = {(Turnover of inverted rated supply of goods and services) x Net ITC Adjusted Total Turnover} - 12[{tax payable on such inverted rated supply of goods and services x (Net ITC ÷ ITC availed on inputs and input services)}].

What is the calculation for removing 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.

How to remove 5% GST from total amount?

So the pre-tax subtotal was $60. The GST is the difference between this and the aftertax total: $63 - $60 = $3. You can see that to find the total before GST all you need to do is divide by 1.05.

Why do you divide by 1.1 for GST?

For example, if the GST-inclusive price is $110, dividing by 1.1 would give a GST-exclusive price of $100. Accurate subtraction of GST from a price ensures businesses report the correct GST amounts on their tax invoices and Business Activity Statements (BAS).

How to do reverse calculation?

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.

What is a reverse calculation?

Using reverse percentages is a way of working backwards on a percentages problem in order to find the original amount. In order to do this, we: Either add/subtract the percentage given in the problem from 100% to determine what percentage we have.

What is the formula for reverse sales tax?

To calculate sales tax backwards from a total, divide the total price by (1 + the tax rate as a decimal) to get the pre-tax price, then subtract that pre-tax price from the total to find the actual tax amount. For example, for a $108 total with 8% tax, you'd calculate $108 / 1.08 = $100 (pre-tax), and then $108 - $100 = $8 (tax).
 

How to remove GST from total amount?

Example

  1. GST Amount = ₹1,180 - (₹1,180 / (1 + (18/100))) = ₹180.
  2. Amount Excluding GST = ₹1,180 - ₹180 = ₹1,000.