Finance / India
GST Calculator: Estimate in Rupees
Add or remove GST with editable Indian rates, CGST/SGST or IGST splits and generic GST presets.
GST Calculator: Estimate in Rupees: Calculates a net amount, GST and gross amount. Intra-state Indian tax is split equally into CGST and SGST; inter-state tax is shown as IGST. The September 2025 shortcuts are 0%, 5%, 18% and 40%, with historical 12% and 28% retained. Custom rates and Australia 10%, New Zealand 15% and Canada 5% federal presets change only the arithmetic rate. All figures use ₹ display units without conversion. Runs 100% locally in your browser with zero server file uploads.
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Results are estimates. Rates, payment dates, fees and taxes can change the actual amount.
GST added = net × rate ÷ 100. GST removed = gross − gross ÷ (1 + rate ÷ 100). Presets change only the rate. All amounts use ₹ display units; the arithmetic works in any currency without conversion.
The September 2025 changes introduced main rates of 5% and 18%, plus a special 40% rate. This shortcut list is not a goods classification guide; special rates and exceptions require the applicable notification. 12% and 28% are retained for historical calculations.
GST Council official announcement
The annual table repeats one identical net amount each year at the entered rate. It is a budgeting scenario, with no compounding or prediction of future tax rates.
Gross amount per year
Years 1 to 5Chart scale: ₹0 to ₹11,800
| Year | Net amount per year | GST per year | Growth (none) | Gross amount per year |
|---|---|---|---|---|
| 1 | ₹10,000 | ₹1,800 | ₹0 | ₹11,800 |
| 2 | ₹10,000 | ₹1,800 | ₹0 | ₹11,800 |
| 3 | ₹10,000 | ₹1,800 | ₹0 | ₹11,800 |
| 4 | ₹10,000 | ₹1,800 | ₹0 | ₹11,800 |
| 5 | ₹10,000 | ₹1,800 | ₹0 | ₹11,800 |
Indian GST announcement
Ministry of Finance, 56th GST Council decisions: https://www.pib.gov.in/PressReleasePage.aspx?PRID=2164586
Add GST = net × rate/100. Remove GST = gross − gross/(1+rate/100). Product classification and special levies are outside this calculator.
Generic preset rate sources
Australian Taxation Office: https://www.ato.gov.au/businesses-and-organisations/gst-excise-and-indirect-taxes/gst ; New Zealand Inland Revenue: https://www.ird.govt.nz/gst/charging-gst ; Canada Revenue Agency: https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/gst-hst-businesses/charge-collect-which-rate.html
The presets are Australia 10%, New Zealand 15% and Canada 5% federal GST. They change only the rate.
How to use it
- Enter amounts and choose the calculation options shown.
- Adjust the rate and duration to match your assumptions.
- Read the estimate, year-by-year chart and table, then download the CSV.
Privacy & limitations
Calculations and CSV exports run in your browser. Your financial inputs are not uploaded.
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Frequently asked questions
What changed in September 2025?
The official announcement describes main rates of 5% and 18% with a special 40% rate. Check the applicable goods or services notification: this calculator does not determine classification, exceptions or cess.
Why are 12% and 28% still available?
They are labelled legacy/historical shortcuts. They are not presented as universal current rates. Enter a custom rate whenever appropriate.
What does the annual table mean?
It repeats one identical amount per year at the entered rate. It is a budget scenario with no compounding or prediction of future rates.
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