GST Invoice Format with UPI: What to Include (+ Free Generator)

A GST invoice has to contain specific fields to be valid in India — miss one and it can cause problems at filing or with your client. And in 2026, the smartest invoices also carry a UPI QR code so the client can pay the exact amount by scanning with GPay, PhonePe, or Paytm. Here is the correct GST invoice format, field by field, plus how to generate one (with the UPI QR) for free.

What a Valid GST Invoice Must Include

• Your business name, address, and 15-digit GSTIN
• A unique, sequential invoice number and the date
• Customer name, address, and their GSTIN (for B2B)
• Place of supply with state name and state code
• HSN code (for goods) or SAC code (for services) per line item
• Description, quantity, rate, and taxable value per item
• CGST + SGST (same state) or IGST (different state), with rates shown
• Total invoice value in figures and in words
• Signature or digital signature of the supplier

CGST + SGST or IGST? The One Rule

Same state (your state = client's state): split the tax into CGST and SGST, half each. Different states: charge the full rate as IGST. Example — an 18% sale within Karnataka is 9% CGST + 9% SGST; the same sale from Karnataka to Maharashtra is 18% IGST. A good generator detects this automatically from the two state codes so you never get it wrong.

Why Add a UPI QR Code to Your Invoice

The hardest part of freelancing and small business is getting paid on time. A UPI QR code printed on the invoice — with the exact amount pre-filled — lets your client scan and pay in seconds, instead of copying your account number and IFSC. Invoices with a scan-to-pay QR get paid noticeably faster.

• Client scans with any UPI app (GPay, PhonePe, Paytm, BHIM)
• The invoice amount is pre-filled — no typing, no mistakes
• No account numbers to share or mistype
• Works for any amount, any client with a smartphone

Generate a GST Invoice with UPI in Minutes

1. 1Open the WowShortcuts Invoice Generator and enter your business details with GSTIN and state (saved for next time).
2. 2Add the client and their state — the correct GST split is detected automatically.
3. 3Add line items with HSN/SAC codes and per-item GST rates.
4. 4Enter your UPI ID to put a scan-to-pay QR on the invoice, add your signature, and download the PDF.

Is It Private?

Yes. The whole invoice — your business details, client list, amounts, bank/UPI info — is generated in your browser and never uploaded. Your client data stays yours.

Conclusion

A correct GST invoice keeps you compliant; a UPI QR code on it gets you paid faster. Use the WowShortcuts Invoice Generator to create GST-valid invoices with automatic tax calculation and a scan-to-pay QR — free, private, and no signup.