To remove 18% GST from a total amount (inclusive of tax), divide the total amount by 1.18 1 . 1 8 to find the base price, or use the formula: Base Price = Total Amount − ( Total Amount × 18 118 ) B a s e P r i c e = T o t a l A m o u n t − ( T o t a l A m o u n t × 1 8 1 1 8 ) . For example, on a ₹ 11 , 800 1 1 , 8 0 0 total, the base price is 11 , 800 ÷ 1.18 = ₹ 10 , 000 1 1 , 8 0 0 ÷ 1 . 1 8 = 1 0 , 0 0 0 , and the GST is 11 , 800 − 10 , 000 = ₹ 1 , 800 1 1 , 8 0 0 − 1 0 , 0 0 0 = 1 , 8 0 0 .
Then, subtract the GST percentage from 100 to determine the base price percentage. For example, if the GST rate is 18%, subtract 18 from 100, leaving 82%. Divide the MRP by 118 and multiply the result by 100 to find the base price. The difference between the MRP and the base price gives you the GST amount.
Understanding GST Rate Reduction
Starting September 22, 2025, the GST Council reduced the number of tax slabs from four to two main rates: 5% merit rate for essential and priority items and 18% standard rate for most other goods and services. There is also a special 40% rate for luxury and sin goods.
How do you remove GST?
Adding 10% to the price is relatively easy (just multiply the amount by 1.1), reverse GST calculations are quite tricky:
If you only have G.S.T, which is 7%, then you would calculate the price after taxes by multiplying by 1.07. So a $200 item would cost 1.07 x $200 = $214 after G.S.T. To calculate how much G.S.T. was paid on a $214 item, simply reverse the calculation by dividing by 1.07, as $214/1.07=$200.
Reverse Charge Mechanism & Calculation
What is a Sales Tax Decalculator?
Removing GST with Constant Rate from the Total Amount
The price with GST includes both the price and the GST. If the GST rate is 10%, the price we have now is 110% of the original price. That is why we need to divide the price with GST in D2 cell by 110, and then multiply the result by 100 to get the price without GST.
Subtracting GST from Price
Calculation: Base Price: ₹50,000. GST Amount: ₹50,000 × 18% = ₹9,000. Total Amount: ₹50,000 + ₹9,000 = ₹59,000.
Barring of GST Return on expiry of three years
The GST network issued another advisory on 7th June 2025, implementing the rule of time-barring of GST return filing beyond three years from the due date. By this update, taxpayers will not be able to file GST returns after three years from the due date of such return.
The New GST Rate Structure
The old four-slab structure (5%, 12%, 18%, 28%) has been simplified. The 12% and 28% slabs were eliminated and replaced with a new structure, which is now primarily 0%, 5%, 18%, and a 40% rate for luxury and “sin” goods.
India's Goods and Services Tax (GST) system has entered a new era with the rollout of GST 2.0, effective from September 22, 2025. The Council has simplified the structure into a 5% slab for essentials, 18% for standard goods, and 40% for luxury/sin items, replacing the earlier complex categories.
How can I file for cancellation of GST registration?
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.
GST Inclusive Price X 3 ÷ 23 = GST Amount
Working backwards to find the GST and GST exclusive amounts from the total GST inclusive price.
Subtracting GST:
To determine the Reverse GST value, you need to calculate the amount of Base Price or the amount exclusive of GST. This can be done by using the formula given below. Once you have the base price, you can further calculate the Reverse GST amount by subtracting it from the GST-inclusive amount.
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.
To deduct a percentage from a total, first convert the percentage to a decimal (divide by 100), then multiply the total by that decimal to find the discount amount, and finally, subtract the discount amount from the original total to get the final price. Alternatively, you can multiply the total by (1 - the decimal percentage) to find the final price directly.
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.
Using Excel to Reverse Calculate GST
Here's how to do it: Use the Formula: To reverse calculate GST, the formula is =Total Price / (1 + GST rate). For example, if the total price is ₹118 with an 18% GST, the person would type =118 / 1.18' in Excel to find the original price of ₹100.
Any amount payable under reverse charge shall be paid by debiting the electronic cash ledger. In other words, reverse charge liability cannot be discharged by using input tax credit. However, after discharging reverse charge liability, credit of the same can be taken by the recipient, if he is otherwise eligible.