To calculate a GST-inclusive price, add the tax to the base price using the formula: Base Price × ( 1 + GST Rate 100 ) B a s e P r i c e × ( 1 + G S T R a t e 1 0 0 ) . For example, with a 10% GST rate, multiply the base price by 1.10 (e.g., $ 100 × 1.10 = $ 110 $ 1 0 0 × 1 . 1 0 = $ 1 1 0 ). If removing GST from a total, use: Total ÷ ( 1 + GST Rate 100 ) T o t a l ÷ ( 1 + G S T R a t e 1 0 0 ) .
An easy formula to find your GST-inclusive price is multiplying the sale price by 1.15. This GST calculation formula is a standard method for calculating GST. For example, if your price is $100, multiply it by 1.15 to get a $115 GST-inclusive price.
Then apply this formula: GST Amount = MRP – (MRP × 100 / (100 + GST Rate)). For example, if a product's MRP is Rs. 118 and the GST rate is 18%, the GST component would be Rs. 18 (118 – (118 × 100 / 118)), making the base price Rs.
Example
To work out the cost including GST, you multiply the amount exclusive of GST by 1.1. You divide a GST inclusive cost by 11 to work out the GST component.
Reverse Charge Mechanism & Calculation
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.
Apply the GST Formula Use a formula like = B2 - B2 / 1.15 for a 15% tax rate to calculate the GST amount. Adjust as needed for different tax rates. (This approach works similarly for other tax rates—just replace 1.15 with 1 + (GST Rate/100). For example, if the GST rate is 18%, use 1.18 instead.)
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.
The Formula for GST Calculation
A simple illustration can demonstrate GST computation: When a product or service costs is ₹2,000 and the GST rate is 20%, then you can compute the net price as follows: ₹2,000 + (₹2,000 X (20/100)) = ₹2,000 + ₹400 = ₹ 2,400.
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.
Calculation: Base Price: ₹50,000. GST Amount: ₹50,000 × 18% = ₹9,000. Total Amount: ₹50,000 + ₹9,000 = ₹59,000.
For adding GST, the following formula is used.
The easiest way to calculate GST on a net price (exclusive of GST) is to multiply the amount by 1.1. To calculate the amount of GST on GST-inclusive goods and services, you'll need to divide the amount by 11.
With the free GST calculator, you can calculate the tax amount in three simple steps. The tool provides you with three fields that have to be filled, and it calculates GST automatically based on what you fill in. Enter the price of the goods or services in the Amount field.
The different slabs for GST are 5%, 12%, 18% and 28%. GST calculation can be explained by a simple illustration : If a goods or services is sold at Rs. 1,000 and the GST rate applicable is 18%, then the net price calculated will be = 1,000+ (1,000X(18/100)) = 1,000+180 = Rs. 1,180.
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.
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.
Inclusive Tax Calculation
To calculate the amount of GST/HST to remit, multiply the revenue from your supplies (including the GST/HST) for the reporting period by the quick method remittance rate, or rates, that apply to your situation.
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. Extract GST Amount: After finding the base price, they can calculate the GST amount by subtracting the base price from the total price. For example, ₹118 - ₹100 = ₹18.
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.