Free GST Invoice Generator
Fill in your details, add your line items and download a GST-compliant tax invoice as a PDF. The CGST/SGST or IGST split, rounding and amount in words are all handled for you — free, with no sign-up and no watermark.
GST rates updated for the 2026 slab structure
Invoice summary
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What makes an invoice GST-compliant
A tax invoice is the document your customer relies on to claim input tax credit. If a required field is missing or wrong, their credit can be denied — which is why an invoice that looks fine to you can still cause a problem downstream.
The fields that cause the most trouble are the invoice number, the GSTIN of both parties, the HSN or SAC code, and the place of supply. The last of these determines whether you charge CGST and SGST or IGST, and it is decided by the location of the recipient rather than where the work was done.
Invoice numbering
Numbers must be consecutive, unique within the financial year, and no longer than 16 characters. Many businesses reset the sequence each April with the financial year in the prefix. What you must avoid is duplicating a number or leaving unexplained gaps, since both are the sort of thing that surfaces during a scrutiny notice.
When to issue an invoice
For goods, the invoice is issued at or before the time of removal or delivery. For services, it must be issued within 30 days of the supply. If you are not registered under GST, you issue a bill of supply rather than a tax invoice, and you cannot collect tax from your customer.
Getting paid, not just invoiced
Raising the document is the easy half. If you sell to larger buyers, note that the MSME rules require payment within 45 days where an agreement exists, and interest runs automatically after that. Keeping a record of invoice dates and payment dates is what makes that enforceable — a folder of PDFs does not.
Frequently asked questions
- What must a GST tax invoice contain?
- A tax invoice needs the supplier's name, address and GSTIN; a consecutive invoice number and date; the recipient's name, address and GSTIN where registered; the HSN or SAC code; a description, quantity and taxable value for each item; the rate and amount of CGST, SGST or IGST; the place of supply; and a signature or digital signature. Getting the invoice number sequence and the place of supply right matters most, because both affect your customer's input tax credit.
- Can I use this invoice generator for free?
- Yes. There is no sign-up, no email required, no watermark and no limit on the number of invoices. The PDF is generated in your browser, so nothing you type is transmitted to us or stored on a server.
- How should I number my invoices?
- Invoice numbers must be consecutive and unique within a financial year, and may run up to 16 characters using letters, numbers, hyphens and slashes. A common pattern is a prefix plus a running number, such as INV/2026-27/001. You must not repeat or reuse a number, and gaps in the sequence invite questions during scrutiny.
- Do I charge CGST and SGST, or IGST?
- Compare your location with the place of supply. Same state means CGST plus SGST, each at half the rate. Different states means IGST at the full rate. Use the toggle above to switch — the totals and the PDF update to match.
- What if I am not registered for GST?
- If you are below the registration threshold you cannot charge GST or issue a tax invoice. You should issue a bill of supply instead, showing no tax. Leave the GSTIN blank and set every line to 0% and this tool will produce a document you can use for that purpose.
- Do I need to show HSN codes?
- In most cases yes. With aggregate annual turnover up to ₹5 crore, a 4-digit HSN code is mandatory on B2B invoices. Above ₹5 crore, a 6-digit code is required on all invoices.
Related free tools
- GST Calculator
Add or remove GST at the 2026 rates and see the CGST, SGST and IGST split instantly. Free, no sign-up.
- Quotation Generator
Send a clean, professional quotation or proforma invoice as a PDF. Free and no sign-up.
- Delivery Challan Generator
Create a delivery challan for goods sent without a tax invoice, and download it as a PDF.
This is one invoice. What about the next hundred?
A generator makes the document. It does not remember your clients, keep your numbering sequence unbroken, or tell you who has not paid. Smart Dhandha does — invoices, payments, expenses, payroll and compliance in one place, built for Indian businesses.
- Saved clients and automatic invoice numbering
- Payment tracking, reminders and overdue alerts
- Books, GST filing data and payroll in one system
This tool is provided free for general guidance and uses the rates noted above. Statutory rates change, and individual circumstances differ — please confirm with your accountant or a qualified professional before relying on these figures for filing or payroll.