# GST Calculator: Add or Remove GST at 5%, 18%, 40% > Free GST calculator for the new 0%, 5%, 18% and 40% slabs. Add GST to a price or take it out, with the CGST, SGST and IGST split for any invoice amount. Source: https://trykosh.com/tools/gst-calculator Free tool - Business and GST # GST calculator: add or remove GST Add GST to a price or strip it out of one, at the slabs in force since 22 September 2025. You also see how the tax splits between CGST and SGST, or goes as IGST to another state. Rules checked 25 October 2026Free - no sign-upRuns in your browser Price including GST INR 29,500.00 INR 25,000.00 + INR 4,500.00 GST at 18% Total GST**INR 4,500.00** CGST**INR 2,250.00** SGST**INR 2,250.00** Value of supply **INR 25,000**GST **INR 4,500** Taxable value INR 25,000.00 CGST @ 9% INR 2,250.00 SGST / UTGST @ 9% INR 2,250.00 Invoice total INR 29,500.00 Within one state the rate splits in half: 9% CGST to the Centre and 9% SGST to the state (UTGST in union territories without a legislature). ## 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-gst-calculator) ## How the GST calculator works Pick whether your amount is before GST (you want the bill total) or already includes GST (you want the base price). Then choose the rate. The main slabs are now 0%, 5%, 18% and 40%: the old 12% and 28% slabs were folded into these from 22 September 2025. Gold, silver and jewellery stay at 3% and rough diamonds at 0.25%, and you can type any other rate. To add GST, the calculator multiplies the base price by the rate: INR 25,000 at 18% carries INR 4,500 of GST, so the bill is INR 29,500. To remove GST, it divides the inclusive price by (1 + rate), so INR 29,500 at 18% gives back INR 25,000. Amounts are shown to the paisa, the way an invoice needs them. Next comes the split. When the seller and the place of supply are in the same state, the rate is halved into CGST for the Centre and SGST for the state (or UTGST in union territories without a legislature such as Chandigarh or Ladakh). When they are in different states, the whole amount is IGST. The place of supply is not always the buyer's address. For goods it is usually where delivery ends; for most services to a registered business it is that business's registered state. Getting it wrong means paying the tax to the wrong government and claiming a refund later, so check it before you raise the invoice. GST = taxable value x rate / 100; Invoice total = taxable value + GST CGST = SGST GST / 2 for a supply within one state IGST the full GST for a supply to another state ## Worked example: Ritika, interior designer in Bengaluru, billing a client in Chennai Ritika's design fee for a Chennai apartment is INR 1,80,000. She is registered in Karnataka and the client is in Tamil Nadu, so this is an inter-state supply. At 18%, the GST is INR 32,400, all of it IGST, and her invoice total is INR 2,12,400. Had the client been in Mysuru, the same INR 32,400 would split into INR 16,200 CGST and INR 16,200 SGST. Price including GST INR 2,12,400.00 INR 1,80,000.00 + INR 32,400.00 GST at 18% Total GST**INR 32,400.00** IGST**INR 32,400.00** Value of supply **INR 1,80,000**GST **INR 32,400** Taxable value INR 1,80,000.00 IGST @ 18% INR 32,400.00 Invoice total INR 2,12,400.00 Supplies to another state carry IGST at the full rate. The buyer's registered state (or delivery state for goods) decides the place of supply. [Load this example into the calculator ->](?amount=180000&supply=inter#calculator) ## Good to know - From 22 September 2025 most goods that were at 12% moved to 5%, and most at 28% moved to 18%. Luxury and sin goods such as pan masala, aerated sugary drinks and large cars sit at 40%. - Check the rate by HSN code (goods) or SAC (services), not by guesswork. Two similar-looking products can sit in different slabs. - Restaurant food is 5% without input tax credit for most standalone outlets. Hotel rooms up to INR 7,500 a night are also 5%. - Registered businesses can claim back the GST they pay on business purchases as input tax credit. For them, GST is a pass-through, not a cost. ## Frequently asked questions How do I calculate GST on a price? Multiply the price before tax by the GST rate. For INR 10,000 at 18%, GST is INR 1,800 and the total is INR 11,800. Within one state that INR 1,800 splits into INR 900 CGST and INR 900 SGST. What are the GST slabs now? Since 22 September 2025 the main slabs are 0% (nil or exempt), 5% (essentials and everyday goods), 18% (the standard rate for most goods and services) and 40% (luxury and sin goods). Special rates of 3% for gold and 0.25% for rough diamonds continue. When do I charge IGST instead of CGST and SGST? Charge IGST when the place of supply is in a different state or union territory from your registration. Charge CGST and SGST (or UTGST) when both are in the same state. Exports and supplies to SEZ units are treated as inter-state and go out zero-rated. Do 12% and 28% GST rates still exist? Not as general slabs. The GST Council merged 12% into 5% and 28% into 18% for most items from 22 September 2025, and introduced 40% for a short list of luxury and sin goods. Old invoices dated before that keep the rate that applied then. Is GST charged on the MRP or on the selling price? On the transaction value, which is the price actually charged, including packing and other charges, after any discount shown on the invoice. MRP already includes GST, so you work backwards from it to find the tax inside. ## Sources and assumptions - [GST Council](https://gstcouncil.gov.in/) - [CBIC GST portal](https://cbic-gst.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.