Free GST Invoice Generator
Fill in the details and download a clean, GST-compliant invoice PDF — no sign-up.
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About this gst invoice generator
Create professional, GST-compliant tax invoices and proforma bills in minutes — no accounting software, no Excel formulas and no sign-up. This free GST invoice generator is built for India and follows the correct GST invoice format, with itemised CGST / SGST / IGST breakdowns, HSN/SAC codes, bank details and your own branding.
GST Invoice Format & Mandatory Fields Explained
A GST tax invoice is the document a registered seller (supplier) issues to the buyer (recipient) for a taxable supply of goods or services. It records what was sold, the taxable value, and the GST charged — split into CGST and SGST for a supply within the same state, or IGST for a supply across states. Under Indian GST law the invoice format is not just a design choice: a tax invoice must carry a specific set of mandatory fields to be valid, because those fields are what let the buyer claim input tax credit (ITC).
Every GST tax invoice should include all of the fields below. The exact wording and layout vary between businesses, but a valid tax invoice format must contain each of these particulars.
- Supplier details & GSTINThe seller’s legal name, address and 15-digit GSTIN (GST Identification Number) — the registration the tax invoice is raised under.
- Invoice number & dateA unique, consecutive serial number (up to 16 characters) for the financial year, plus the date the invoice is issued.
- Recipient details & GSTINThe buyer’s name, address and GSTIN. If the buyer is unregistered and the value is ₹50,000 or more, the name, address and place of supply are still required.
- HSN / SAC codeThe HSN code for goods or SAC code for services against each line item — the digit count required depends on the supplier’s turnover.
- Description, quantity & taxable valueA clear description of each item, the quantity/unit, the rate, and the taxable value (amount before tax) for the line.
- GST rate & amount (CGST/SGST/IGST)The tax rate and the tax amount for each line and in total — CGST + SGST for intrastate supply, or IGST for interstate supply.
- Place of supplyThe state (and state code) of supply — this is what decides whether CGST+SGST or IGST applies. Mandatory for interstate supplies.
- Reverse charge flagWhether GST is payable on reverse charge (a Yes/No indication), as required on the invoice.
- SignatureThe signature or digital signature of the supplier or their authorised representative.
GST tax invoice format (worked example): below is a safe, generic example of an intrastate tax invoice — supply within one state, so GST is split into CGST + SGST. The seller, customer, invoice number, GSTINs and amounts are all fictional and shown only to illustrate the layout. Never use these sample GSTINs; always enter your own business’s real details.
| Description | HSN/SAC | Qty | Rate | Taxable | GST % | Amount |
|---|---|---|---|---|---|---|
| A4 Notebooks (200 pg) | 4820 | 100 | 45.00 | 4,500.00 | 12% | 5,040.00 |
| Whiteboard Markers (box) | 9608 | 20 | 120.00 | 2,400.00 | 18% | 2,832.00 |
| Taxable Value | ₹ 6,900.00 |
| CGST | ₹ 525.00 |
| SGST | ₹ 525.00 |
| Grand Total | ₹ 7,950.00 |
Sample only. The names, invoice number, GSTINs and amounts above are fictional and used purely to show the layout — this is a tax invoice (CGST + SGST, intrastate supply), not a board document. Always use your own business’s real GSTIN, invoice number and details.
CGST + SGST vs IGST: when the supplier and the place of supply are in the SAME state (an intrastate supply), the GST is split equally into CGST (Central GST) and SGST (State GST) — so an 18% rate becomes 9% CGST + 9% SGST. When they are in DIFFERENT states (an interstate supply), the whole tax is charged as IGST (Integrated GST). This generator reads the supplier state and the customer state and applies the correct split automatically, so you never have to decide it by hand.
Tax invoice vs bill of supply vs proforma invoice: a tax invoice is issued by a GST-registered supplier for a taxable supply and is the document the buyer uses to claim input tax credit. A bill of supply is issued instead of a tax invoice when no GST is charged — for example by a composition-scheme dealer or for exempt goods — and so shows no tax. A proforma invoice is not a tax document at all: it is a quote or estimate sent before the sale to confirm price and terms, carries no tax-invoice validity, and does not let the buyer claim credit. This tool can produce both a tax (payment) invoice and a proforma invoice — the proforma is clearly marked as “not a valid tax invoice” so it is never mistaken for the real thing.
How to make a GST invoice online
- Choose tax or proforma invoicePick a Payment (tax) invoice for a real GST-charged sale, or a Proforma invoice for a quote/estimate before payment — the proforma is clearly marked as not a valid tax invoice.
- Add your business detailsEnter your business name, address, state and GSTIN, plus your bank/UPI details and logo so the customer can identify and pay you.
- Add the customer and place of supplyEnter the customer’s name, address, state and GSTIN, and the place of supply — this is what decides whether CGST+SGST or IGST applies.
- Add the line items with HSN/SACAdd each item with its description, HSN/SAC code, quantity and price. The tool suggests the GST rate from the code and you can adjust it.
- Let it calculate the GSTThe tool computes the taxable value and splits the tax into CGST + SGST or IGST automatically based on the states, then totals the grand amount and balance due.
- Add terms, advance and signature spaceFill in the invoice number and date, due date, payment method, any advance already paid, and your terms and conditions.
- Download the print-ready PDFCheck the live A4 preview, then download the GST invoice as a print-ready PDF to email or print. Repeat for the next invoice — it is unlimited and free.
Frequently Asked Questions
What is the GST invoice format?
A GST invoice format is the standard layout of a tax invoice under Indian GST. It shows the supplier’s name, address and GSTIN; a unique invoice number and date; the recipient’s name, address and GSTIN; each line item with its description, HSN/SAC code, quantity, rate and taxable value; the GST rate and amount split into CGST + SGST (intrastate) or IGST (interstate); the place of supply; a reverse-charge indication; the grand total; and a signature. The worked example in the format guide above shows this exact layout, and this tool produces it automatically.
What are the mandatory fields on a GST invoice?
A valid GST tax invoice must contain: the supplier’s name, address and GSTIN; a consecutive serial invoice number (up to 16 characters) and the invoice date; the recipient’s name, address and GSTIN (and place of supply for interstate or high-value unregistered sales); the HSN code for goods or SAC code for services; the description, quantity and taxable value of each item; the GST rate and amount (CGST, SGST and/or IGST); the place of supply with state code; whether tax is payable on reverse charge; and the signature or digital signature of the supplier. Missing these particulars can make the invoice invalid for claiming input tax credit.
Is a proforma invoice valid for GST?
No. A proforma invoice is only a quote or estimate sent before a sale to confirm the price, items and terms — it is not a tax invoice. It does not carry GST-invoice validity, no GST liability arises from it, and the buyer cannot claim input tax credit against it. Once the order is confirmed you must raise a proper tax invoice. This generator can create a proforma invoice for you, and it is clearly marked “not a valid tax invoice” so it is never mistaken for one.
What is the difference between a tax invoice and a bill of supply?
A tax invoice is issued by a GST-registered supplier for a taxable supply and shows the GST charged, so the buyer can claim input tax credit. A bill of supply is issued when no GST is charged — for example by a composition-scheme dealer or for GST-exempt goods — and therefore shows no tax. If you are charging GST, you issue a tax invoice; if you are not (exempt or composition), you issue a bill of supply.
When is CGST + SGST charged and when is IGST charged?
It depends on the place of supply. If the supplier and the place of supply are in the same state (an intrastate supply), GST is split into CGST + SGST — so an 18% rate becomes 9% CGST + 9% SGST. If they are in different states (an interstate supply), the full tax is charged as IGST. This tool compares the supplier state and the customer state and applies the correct CGST/SGST or IGST split for you automatically.
What is the HSN/SAC code on an invoice and do I need it?
HSN (Harmonised System of Nomenclature) codes classify goods and SAC (Services Accounting Code) codes classify services for GST. Each line item on a tax invoice should carry the relevant HSN or SAC code; the number of digits required depends on the supplier’s annual turnover. In this generator, when you enter an HSN/SAC code the tool suggests the typical GST rate for that category — you can always override the rate manually.
Is this GST invoice generator free?
Yes — the GST invoice generator is 100% free with no sign-up, no watermark and no limit on how many tax invoices or proforma invoices you create or download.
Can I add my logo, bank details and UPI to the invoice?
Yes. You can upload your business logo, pick an accent colour, and add your bank name, account number, IFSC and UPI ID so the customer can pay you directly. You can also set the supplier and customer GSTIN/PAN, the place of supply, a due date, payment method, terms and conditions, and an advance/part payment so the invoice shows the correct balance due.
Is an invoice made with this tool legally compliant?
The tool produces an invoice in the correct GST tax-invoice format with all the standard mandatory fields, which you then complete with your own real business details. Compliance ultimately depends on the information you enter — your valid GSTIN, a correct consecutive invoice number, the right HSN/SAC codes and the correct place of supply. Use this tool to draft and print a correctly formatted invoice; for full GST filing and bookkeeping, use accounting software or a platform like Inforida’s Nucleus.
Is my business and customer data safe?
Previews and downloads are created in your browser. On export, Inforida records usage information including entered text; uploaded images are not included in those usage logs.
Enter your business and customer details, add line items with their HSN/SAC code, and the tool auto-detects the GST rate, splits it into CGST + SGST (intrastate) or IGST (interstate) based on the place of supply, and totals everything for you. Download a clean, print-ready A4 PDF you can email to the customer or print on letterhead.
Whether you run a school office raising bills for fees, books and transport, a small business issuing tax invoices, or a vendor sending a proforma invoice (quote) before payment, this free invoice maker gives you a correct tax invoice format and proforma invoice format every time.
Previews and downloads are created in your browser. On export, Inforida records usage information including entered text; uploaded images are not included in those usage logs.