To take GST out of a total amount (reverse charge), divide the total amount by 1 + ( GST rate / 100 ) 1 + ( G S T r a t e / 1 0 0 ) to find the net price, then subtract that from the total. For example, with an 18% GST rate, the formula is: Original Price (Excl. GST) = Total Amount / 1.18. GST Amount = Total Amount - Original Price.
Example
How do you remove GST?
The GST Calculator operates based on a straightforward formula: GST Amount = (Selling Price x GST Rate) / 100. Here, the Selling Price is determined by adding the Cost Price and Profit Amount.
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.
Reverse Charge Mechanism & Calculation
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.
Calculation: Base Price: ₹50,000. GST Amount: ₹50,000 × 18% = ₹9,000. Total Amount: ₹50,000 + ₹9,000 = ₹59,000.
How to remove tax from the total amount? To remove tax from the total amount, first calculate the pre-tax amount using the formula: Pre-tax Amount = Total Amount / (1 + Tax Rate/100). Then subtract the pre-tax amount from the total amount to find the tax amount.
GST (Goods and Services Tax) is a 10% tax applied to most goods and services sold in Australia. Think of it as the government's slice of the pie—exactly one-eleventh (1/11th) of the total price including GST.
If you need to take GST off a total price, use the formula = Price / (1 + GST rate). For example, if the total price is ₹118, you'd type = 118 / 1.18 to find the original price before GST.
The tax invoice that you receive will likely show $100 (which is equal to 1/11th) as being payable by you. The amount of $1,100 is the gross expense, the $100 is GST and $1,000 is the net amount. You will claim back the $100 in your BAS and the net amount of $1,000 will show in your tax return.
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.
1. Removing GST From a GST-Inclusive 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.
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.
Maximum marginal rate is the highest rate of tax at any income level. This means for those with incomes between Rs 2 crore and Rs 5 crore, 39% will be the highest applicable tax rate, and for those with incomes above Rs 5 crore, it will be 42.74% — the highest tax rate since 1992.
2022, Works contract services provided to Central and State Government, or Local Authorities, which were earlier eligible for concessional rate of 12% GST,would attract GST at the rate of 18% in view of amendment carried out in notification No. 11/2017- Central Tax (Rate) vide notification No.
The formula for calculating GST is to multiply the net price (exclusive of GST) by 1.1 or divide the price including GST by 11 to determine the GST component.
Adding 10% to the price is relatively easy (just multiply the amount by 1.1), reverse GST calculations are quite tricky:
How do you calculate 5% GST?