# Reverse GST Calculator: Base Price From Inclusive Price > Reverse GST calculator: enter a GST-inclusive price to get the base price and the exact GST inside it, with the CGST and SGST split at every slab rate. Source: https://trykosh.com/tools/reverse-gst-calculator Free tool - Business and GST # Reverse GST calculator: find the price before GST Start from a price that already includes GST, such as an MRP, a quote or a bill, and find the taxable value and the tax inside it. It's the number you need for input tax credit claims and for pricing. Rules checked 25 October 2026Free - no sign-upRuns in your browser Base price (excluding GST) INR 10,000.00 GST inside the price: INR 1,800.00 GST share of price**15.25%** CGST**INR 900.00** SGST**INR 900.00** Base price **INR 10,000**GST **INR 1,800** Price paid (GST inclusive) INR 11,800.00 x 100 / 118 INR 10,000.00 CGST @ 9% INR 900.00 SGST / UTGST @ 9% INR 900.00 Base price INR 10,000.00 INR 11,800.00 split at each common rate GST rate Base price GST inside 5% INR 11,238.10 INR 561.90 18% INR 10,000.00 INR 1,800.00 40% INR 8,428.57 INR 3,371.43 3% INR 11,456.31 INR 343.69 Taking 18% of INR 11,800.00 gives INR 2,124.00, which overstates the tax by INR 324.00. GST inside a price is price x rate / (100 + rate). ## Upload your statement and Kosh does this for you. Upload your bank statements and Kosh separates business from personal spending and keeps your tax and GST dates in view. [Start free](/signup?via=tool-reverse-gst-calculator) ## How the reverse GST calculator works Most prices you see in India include GST: shelf MRPs, restaurant menus with 'inclusive of taxes', many supplier quotes. To find the base price, divide the inclusive amount by (100 + rate) and multiply by 100. At 18%, that means dividing by 1.18. The GST inside the price is the difference between the two. A shortcut: GST = inclusive price x rate / (100 + rate). At 18%, the tax is 18/118, or 15.25%, of the inclusive price; at 5% it is 5/105, or 4.76%; at 40% it is 40/140, or 28.57%. The most common mistake is to take the rate straight off the inclusive price, for example 18% of INR 11,800. That gives INR 2,124 instead of the correct INR 1,800, and it overstates both the tax and any input tax credit you claim. The calculator shows how far off that shortcut would be for your amount. Because the slab matters so much, the result also lays out the same inclusive price at 5%, 18%, 40% and 3%. That helps when a supplier's quote doesn't say which rate it assumed. Base price = inclusive price x 100 / (100 + rate); GST = inclusive price − base price rate GST rate in percent, e.g. 18 ## Worked example: Arjun, freelance video editor in Indore, buying a laptop Arjun buys a laptop for his work at INR 84,999 including 18% GST. The taxable value is INR 84,999 x 100 / 118 = INR 72,033.05, and the GST inside is INR 12,965.95, split as INR 6,482.97 CGST and INR 6,482.97 SGST. As a GST-registered freelancer he can claim that INR 12,965.95 as input tax credit. Taking 18% of INR 84,999 would have wrongly given INR 15,299.82. Base price (excluding GST) INR 72,033.05 GST inside the price: INR 12,965.95 GST share of price**15.25%** CGST**INR 6,482.97** SGST**INR 6,482.97** Base price **INR 72,033**GST **INR 12,966** Price paid (GST inclusive) INR 84,999.00 x 100 / 118 INR 72,033.05 CGST @ 9% INR 6,482.97 SGST / UTGST @ 9% INR 6,482.97 Base price INR 72,033.05 Taking 18% of INR 84,999.00 gives INR 15,299.82, which overstates the tax by INR 2,333.87. GST inside a price is price x rate / (100 + rate). [Load this example into the calculator ->](?amount=84999#calculator) ## Good to know - MRP on packaged goods must include all taxes, so the base price of anything bought at MRP is always below the sticker. - To claim input tax credit, you need a tax invoice with your GSTIN on it. A retail bill without your GSTIN doesn't qualify, however clear the GST figure. - Round-off differences of a few paise between your figure and the invoice are normal: GST is computed line by line and then rounded. - If a supplier says 'GST extra', the quote is the base price: use the GST calculator to add tax instead. ## Frequently asked questions How do I remove 18% GST from a total? Divide the total by 1.18. For INR 5,900, the base price is INR 5,000 and the GST is INR 900. Multiplying INR 5,900 by 18% would give INR 1,062, which is wrong because it charges tax on the tax. What percentage of an inclusive price is GST? It is rate / (100 + rate). That is 4.76% of the price at 5% GST, 15.25% at 18% and 28.57% at 40%. For gold at 3% it is 2.91%. Why do I need the base price if I already know the total? Your accounts record sales and purchases at the taxable value, and GST returns report tax and taxable value separately. Pricing decisions such as margin and markup are also worked out on GST-exclusive figures. Can I claim the GST inside a restaurant or hotel bill? Restaurant service at 5% comes without input tax credit for most outlets, so it can't be claimed. Hotel stays and business travel can be claimed if the invoice carries your GSTIN and the expense is for business. ## Sources and assumptions - [CBIC GST portal](https://cbic-gst.gov.in/) - [GST Council](https://gstcouncil.gov.in/) Rules and rates last checked on 25 October 2026. Results are estimates for planning and education, not tax, legal or investment advice. Kosh is an educational financial planning tool by Primedepth Labs. It is not a SEBI-registered investment adviser and does not offer personalised investment advice, hold your money or execute trades. Markets carry risk; read scheme documents carefully and consult a registered adviser before acting.