To exclude GST from a price, divide the GST-inclusive price by 1 + ( GST rate ÷ 100 ) 1 + ( G S T r a t e ÷ 1 0 0 ) . For a standard 10% GST, divide the total price by 1.1 1 . 1 (e.g., $ 110 ÷ 1.1 = $ 100 $ 1 1 0 ÷ 1 . 1 = $ 1 0 0 ). To find the GST amount specifically, divide the total price by 11 1 1 (e.g., $ 110 ÷ 11 = $ 10 $ 1 1 0 ÷ 1 1 = $ 1 0 ).
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.
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 do you remove GST?
Firstly, divide the GST-inclusive price by (1 + (GST rate/100)) to determine the base price. Lastly, subtract this value from the total price. Yes, you can use the reverse GST calculator for all GST types—CGST, SGST, and IGST.
Reverse Charge Mechanism & Calculation
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).
Goods and Services Tax (GST)
GST is an additional 10% tax which applies to goods and services. GST is ordinarily included in invoices. However, you may be unsure as to whether your business also needs to provide it on quotes.
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).
Excel Formula to Remove the GST amount from a Total
If you have a GST-inclusive total and need to calculate the GST-exclusive amount (i.e., remove GST), divide the Total figure by 1.15.
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.
Exports and supplies to SEZs are classified as zero-rated supplies, meaning no GST is charged on them. Yet importantly, the supplier can still claim a refund of unutilised input tax credit—either by exporting under a bond/Letter of Undertaking (LUT) without paying IGST or by paying IGST and claiming the refund later.
You can calculate the total price excluding the standard VAT rate (20%) by dividing the original price by 1.2. To work out the reduced VAT rate (5%), divide the original price by 1.05.
Subtracting GST
Sometimes you need to subtract GST to work out how much GST is included, or the pre-GST price. To work out how much GST is included in a total price, divide the price by 11. If you want the total price before GST was added, divide by 1.1.
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.
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.
Calculating GST from the Amount Including GST
How much is 20 percent off?
List of exempted goods under GST in India:
Generally, businesses and other organisations registered for GST will: include GST in the price they charge for their goods and services.
At each stage of sale or purchase in the supply chain, the tax is collected on value-added goods and services, through a tax credit mechanism. GST is levied on the supply of all goods and services except the supply of liquor for human consumption which is still liable to state excise duties and the VAT.
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. Do that for $1700 and you have your subtotal. Then subtract that from $1700 to get the amount of GST you paid.
Persons required to comply with Rule 86B
Registered persons whose monthly taxable turnover exceeds ₹50 lakhs (excluding exempt and zero-rated supplies) are required to pay at least 1% of their GST liability in cash, subject to certain exceptions.