GST Calculator & Invoice Generator
Add or remove GST, split CGST/SGST, then generate a downloadable tax invoice PDF.
- Taxable value
- ₹1,00,000.00
- CGST @ 9%
- ₹9,000.00
- SGST @ 9%
- ₹9,000.00
- Total GST
- ₹18,000.00
- Invoice total
- ₹1,18,000.00
- Effective rate on base
- 18.00%
Shares the figure you see above, with a link back to this calculator. Nothing is uploaded.
Invoice generator
The invoice uses the amount and rate above. Fill in the parties and download a PDF with the CGST/SGST or IGST split already laid out.
| Description | HSN/SAC | Qty | Amount |
|---|---|---|---|
| Professional services | 998314 | 1 | 1,00,000 |
| Taxable value | ₹1,00,000.00 |
|---|---|
| CGST @ 9% | ₹9,000.00 |
| SGST @ 9% | ₹9,000.00 |
| Total | ₹1,18,000.00 |
- One rate is applied to the whole invoice. A mixed-rate invoice needs a line per rate, and this generator produces a single-line invoice.
- The PDF is generated in your browser — nothing is uploaded, and no draft invoice is stored anywhere.
- A tax invoice must also carry a consecutive serial number, the place of supply and, where applicable, the reverse-charge declaration. Add anything your buyer needs before issuing it.
- GST rates and HSN/SAC classifications change. Confirm the rate for your specific goods or services on the GST portal before raising the invoice.
Pro is coming
PlaceholderA PDF report of your result, saved history across tools and CSV export. The buttons below are placeholders — nothing is charged and nothing is sent.
- Downloadable PDF report of any result
- Saved history you can reopen later
- CSV export for your own records
About the gst calculator & invoice generator
GST in India is charged on the value of the supply, and the same rate is split in half between CGST and SGST for a sale inside one state — so an 18% intra-state sale is 9% CGST plus 9% SGST. For an inter-state sale the whole amount becomes IGST instead.
The calculator works in both directions. Add GST when you know the price before tax and need the invoice total; remove GST when you have an inclusive price and need to recover the taxable value and the tax inside it. Removing GST is not simply subtracting a percentage — the tax has to be divided out, which is why the two directions give different numbers for the same rate.
The invoice generator turns the result into a proper tax invoice with your business details, the buyer's details, the HSN or SAC code and the tax split, then downloads it as a PDF you can email or print.
Frequently asked questions
How do I remove GST from an inclusive price?
Divide the inclusive amount by 1 plus the rate. For 18%, divide by 1.18: a ₹1,180 inclusive price gives a taxable value of ₹1,000 and ₹180 of GST. Subtracting 18% from ₹1,180 would wrongly give ₹967.60.
What is the difference between CGST, SGST and IGST?
For a supply inside one state, the GST rate is split equally: half is CGST, collected by the centre, and half is SGST or UTGST, collected by the state. For a supply between two states the full rate is charged as IGST instead, and the selling state does not keep any of it.
Which GST rate applies to my goods or services?
Most services are 18%, most mass-consumption goods are 5% or 12%, and luxury and sin goods sit at 28%. Some items are nil-rated or exempt, and a few have special rates. The exact rate for your HSN or SAC code is listed on the GST portal, and it is worth confirming before you raise the invoice.
What must a GST invoice contain?
A tax invoice needs a consecutive serial number, the date, your name, address and GSTIN, the buyer's name and GSTIN when they are registered, the HSN or SAC code, the description and quantity, the taxable value, the rate and amount split into CGST, SGST or IGST, and the total value with the place of supply.
Do I need a GSTIN to raise an invoice?
You can issue a normal invoice without one, but you can only charge GST and show a tax invoice if you are GST-registered. This tool prints whatever GSTIN you enter, so leave it blank if you are not registered and it will be omitted.
Disclaimer
These calculators are for estimates and general information only. They are not financial, investment, tax or legal advice, and they do not replace a chartered accountant, a financial adviser or the official rules. Rates, slabs and thresholds change — verify anything important against the source before acting on it.
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