Last reviewed: — Rate guidance, invoice examples and the GST Council source link updated.
GST Calculator India
Reviewed: 19 Oct 2026Choose the rate applicable to your invoice. GST Council rate-reform guidance is a starting point; the item’s classification, notification and supply date determine its treatment.
Base price or total inclusive amount
Use the applicable rate from the invoice and relevant tax notification
Exclusive adds tax to base; Inclusive extracts tax from gross
Determines whether tax is split into CGST/SGST or paid as IGST
Input Error
Results
For information only. Not tax advice. Verify with a Chartered Accountant before filing.
A GST calculator adds tax to a price before GST or extracts tax from a GST-inclusive total. Enter the amount and applicable rate, then choose the supply type to see a CGST/SGST or IGST split. It checks the arithmetic; you must establish the correct rate and place of supply for the invoice.
Adding 18% GST to ₹10,000 gives ₹1,800 in tax and an invoice total of ₹11,800. The intra-state split is CGST ₹900 and SGST ₹900.
GST calculation formula: inclusive and exclusive prices
| Price you have | Calculation |
|---|---|
| Before GST (exclusive) | GST = Base × Rate / 100; Total = Base + GST |
| Including GST (inclusive) | Base = Total × 100 / (100 + Rate); GST = Total − Base |
When removing GST, the percentage applies to the underlying base. Subtracting the rate directly from the inclusive total gives a different result because that total already contains tax.
Worked example: add 18% GST and reverse it
Assume 18% is the applicable rate for a taxable base of ₹10,000. The figures below use an ordinary intra-state supply for the split; this example does not establish the rate for any particular product.
Step 1: multiply ₹10,000 by 18 / 100 to get ₹1,800 of GST. Step 2: add it to the base to get ₹11,800. To reverse the calculation, enter that total, choose Remove GST and divide by 1 + 18 / 100: the base is ₹10,000 and included tax is ₹1,800.
| Scenario | Taxable base | GST | Invoice total |
|---|---|---|---|
| Add GST | ₹10,000 | ₹1,800 | ₹11,800 |
| Remove GST from that total | ₹10,000 | ₹1,800 | ₹11,800 |
CGST and SGST versus IGST
| Supply in the example | CGST | SGST | IGST |
|---|---|---|---|
| Intra-state | ₹900 | ₹900 | — |
| Inter-state | — | — | ₹1,800 |
For ordinary taxable supplies, compare the supplier’s location with the legal place of supply. The IGST Act, sections 7 and 8 defines inter-state and intra-state supplies and lists exceptions, including SEZ supplies. A buyer’s address alone is not enough for every case. The calculator does not separately label UTGST.
Choose the GST rate for the invoice
The 56th GST Council recommendations, dated 3 September 2025 describe a broad 5% merit rate, 18% standard rate and a special 40% rate for selected supplies, alongside exemptions. This is not an exhaustive item-by-item rate list. Check the relevant notification and HSN/SAC classification for the date of supply.
The preset percentages are calculation options, not a classification service. Do not assume every former 28% item moved to 40%, or that an insurance exemption covers every policy. This calculator does not calculate compensation cess or input tax credit.
For invoice checks, use one rate at a time and compare the calculation with the supplier’s breakdown. ClearTax’s GST calculation guide also distinguishes inclusive and exclusive prices.
Frequently asked questions
How do I calculate GST on a price?
How do I remove GST from an inclusive amount?
How do I calculate 18% GST?
What is the difference between CGST, SGST and IGST?
Is reverse GST calculation the same as reverse charge?
Can I use this GST calculator for an invoice?
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Regulatory baseline, assumptions & legal safety
Operational boundaries and statutory provenance governing this calculation model.
Key Operational Assumptions
- The GST rate slab (0%, 5%, 12%, 18%, 28%, or 40%) selected by the user accurately represents the statutory classification of the good or service.
- Exclusive mode calculation assumes base price does not include GST and adds statutory tax.
- Inclusive mode calculation extracts embedded GST backwards from gross price: Base = Total ÷ (1 + Rate%).
- Intra-state supplies (within same state/UT) are split exactly 50% as CGST and 50% as SGST/UTGST.
- Inter-state supplies (between different states) apply the full tax rate as IGST.
Authoritative Source & Regulatory Baseline
- Authoritative Source
- CBIC GST Goods and Services Rates Schedule(Central Board of Indirect Taxes and Customs (CBIC))
- Governing Framework
- Central Goods and Services Tax Act, 2017
- Applicable Period
- Current (FY 2017-18 onward)
- Jurisdiction & Verification
- Republic of India • Verified 2026-09-24
Statutory context: Standard GST slabs (0%, 5%, 12%, 18%, 28%, 40%) established per CGST Act 2017 and updated via CBIC notifications. 40% statutory rate applies to specified luxury, demerit, and special schedule goods/services. Intra-state supplies split equally into CGST and SGST; inter-state supplies apply full rate as IGST.
Model Scope & Specific Limitations
This calculator does not model the following scenarios or provisions:
- Does not automatically determine product or service classification or assign HSN/SAC tariff codes.
- Does not compute composition scheme tax rates (e.g. 1% for traders/manufacturers, 5% for restaurants, 6% for service providers under Section 10).
- Does not calculate GST Compensation Cess applicable to specified demerit goods (e.g. luxury motor vehicles, aerated waters, pan masala, tobacco).
- Does not verify Input Tax Credit (ITC) eligibility, blocked credits under Section 17(5), or Reverse Charge Mechanism (RCM) applicability under Section 9(3)/9(4).
- Educational calculator; not binding legal tax advice. Consult CBIC notifications for specific tariff classifications.
Educational & Legal Disclaimer
This calculator uses the rules and published rates by Central Board of Indirect Taxes and Customs (CBIC) for Current (FY 2017-18 onward). Estimated result based on the inputs and assumptions provided.
This calculator uses the rules/data published by Central Board of Indirect Taxes and Customs (CBIC) for Current (FY 2017-18 onward). Estimated result based on the inputs and assumptions provided. Educational tool only; not legal or filing advice. Check official CBIC notifications for your specific situation.
GST Tax Amount
₹1,800