Indian GST splits into CGST and SGST within a state, or a single IGST across state lines, and input credit offsets it.
The amount, the rate, and where the supply goes
Amount and rate
Net amount (for Add) or tax-inclusive amount (for Remove/Reverse), in your local currency.
%
Placeholder only. Under GST 2.0 (from 22 Sep 2025) the main slabs are 0/5/18%, plus 40% on select sin/luxury goods (the 12% and 28% slabs were removed) — verify the current rate and HSN code with CBIC.
Add treats the amount as net; Remove/Reverse treat it as tax-inclusive and extract the GST.
Supply type and credit
Intra-state splits GST into equal CGST and SGST; inter-state charges a single IGST.
GST already paid on purchases that you can offset. Leave at 0 if none.
GST Amount
180.00
Total GST on the supply, in your local currency.
Formula verified 13 September 2026
Net Price (before GST)
1,000.00
Taxable value excluding GST.
Gross Price (with GST)
1,180.00
Net price plus GST.
Net GST Liability After ITC
180.00
GST due after offsetting input tax credit (not below zero).
Intra-state splits the GST into equal CGST and SGST; inter-state charges a single IGST. Rates are placeholders — verify with CBIC.
Component
Rate
Amount
CGST
9.00%
90.00
SGST
9.00%
90.00
IGST
—
0.00
Total GST
18.00%
180.00
Estimates only — not financial, tax, or professional advice.
100% private — every number you enter is calculated in your browser and never sent to our servers.
What it calculates: GST Amount, Net Price (before GST), Gross Price (with GST), Net GST Liability After ITC.
Updated 5 June 2026 · Transparent assumptions
Intra-state splits the rate in half; inter-state does not
A supply within a state carries CGST and SGST at half the rate each — 18% becomes 9% central and 9% state. A supply across state lines carries IGST at the full 18% instead. The total the customer pays is identical either way; what differs is which government receives it.
This matters for invoicing rather than for pricing. An invoice showing IGST on an intra-state supply, or the reverse, is incorrect even though the amount collected is right, and it creates a mismatch in the returns of both parties.
Extracting tax from a total is division, not a percentage of it
To add 18% to 1,000 you multiply — the tax is 180. To extract 18% from an inclusive 1,180 you divide by 1.18, which gives a base of 1,000 and tax of 180. Taking 18% of 1,180 gives 212.40 and is wrong.
The mode toggle exists because both directions are needed constantly: pricing a product from a cost base uses one, and breaking down a receipt uses the other.
You pay tax on the value you added, not on the whole price
A registered business offsets the GST it paid on purchases against the GST it collected on sales, and remits only the difference. That is why GST is not a cost to a registered business in the middle of a supply chain — it is a cost to the final consumer.
The credit is conditional. It generally requires a valid tax invoice, the supplier to have actually reported and paid, and the goods or services to be used for business purposes. Blocked categories exist, and credit claimed where the supplier defaulted is commonly reversed later.
Slabs, exemptions and reverse charge sit outside this calculation
India operates several GST slabs with a compensation cess on some goods, and the classification of a specific product determines which applies. The calculator takes the rate you enter rather than guessing at an HSN classification.
Reverse charge, where the recipient rather than the supplier pays, composition scheme rates, and place-of-supply rules for services are all outside this tool. For anything beyond a straightforward computation, confirm the position with a tax professional.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Tax rules vary by country, state, tax year, filing status, income type, deductions, and exemptions. This calculator is educational and uses the values you enter. Always verify final tax treatment with official sources or a qualified tax professional.
Published the calculator with its formula, worked example, assumptions, limitations and a bespoke guide, and added an automated formula test suite covering it.
Tested GST added to and extracted from a price, the CGST and SGST split against a single IGST charge, and the input tax credit offset.
Tested that extracting tax from an inclusive price is division rather than a percentage of the total, and that the two supply types collect the same amount.
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