Free Invoice Format — GST Tax Invoice Template & Format Guide

An invoice (or bill) is the document a seller issues to a buyer recording a sale — what was supplied, how much was charged, the tax applied, and what is due. In India, a GST-registered business must raise a "tax invoice" that carries the specific particulars set out in Rule 46 of the CGST Rules; getting the format wrong can cost the buyer their input tax credit and expose the seller to penalties. This guide explains exactly what a correct invoice contains — header details, GSTIN, HSN/SAC codes, taxable value, the CGST+SGST or IGST split, and the legally required particulars — and how to build one. KukBook lets you create, print and share these invoices free, and for GST documents it also prepares your e-invoice (IRN) data and GSTR-1 and GSTR-3B return data, and records e-way bill numbers, straight from the same billing data — no re-keying.

What this invoice / bill includes

Tips

  • Keep your invoice numbering strictly consecutive with no gaps for the whole financial year — broken or duplicated series are the first thing a GST audit flags and they break GSTR-1 reconciliation.
  • Confirm the place of supply before you raise the bill: intra-state sales take CGST+SGST, inter-state sales take a single IGST line. Choosing the wrong split is a common reason a buyer's input tax credit gets blocked.
  • Put the correct HSN/SAC code on every line — it determines the GST rate. A wrong code means a wrong tax amount and a mismatch in your return.
  • For B2B supplies over the e-invoicing turnover threshold, generate the e-invoice (IRN + QR) on the IRP before sharing the PDF; where e-invoicing applies, an invoice without a valid IRN is not treated as valid and the buyer cannot claim credit.
  • Generate an e-way bill on the e-way bill portal before moving goods worth more than ₹50,000 — then record its number and date on the KukBook invoice so the document details are on file at dispatch.

Frequently asked questions

What is the difference between a tax invoice and a bill of supply?

A tax invoice is issued by a GST-registered seller on taxable supplies and shows GST separately, letting the buyer claim input tax credit. A bill of supply is issued when no GST is charged — by composition-scheme dealers or on exempt goods — and shows no tax breakup. KukBook can create both formats.

What fields are mandatory on a GST invoice in India?

Rule 46 of the CGST Rules requires the title "Tax Invoice", a unique serial number and date, the supplier's name, address and GSTIN, the recipient's details (GSTIN for B2B), place of supply and state code, HSN/SAC code, item description, quantity, taxable value, GST rate and amount split into CGST+SGST or IGST, the total, a reverse-charge note where applicable, and the supplier's signature. KukBook's template includes these by default.

Is the KukBook invoice format really free, and can I share it?

Yes. You can create, print and share invoices free — download as PDF, print, or send to your customer. For GST documents, KukBook also prepares your e-invoice (IRN) data and GSTR-1 and GSTR-3B return data from the same data, and records e-way bill numbers. You generate the IRN and e-way bill on the government portals.

Do I need an e-invoice and e-way bill for every bill?

No. E-invoicing applies only once your turnover crosses the government threshold, and an e-way bill is needed only when goods worth more than ₹50,000 are moved. Below those limits a normal tax invoice is enough. When your transaction needs them, KukBook prepares the e-invoice (IRN) data and records the e-way bill number; you generate the IRN and e-way bill on the government portals.

Create, print and share a GST-ready invoice free with KukBook — and prepare your e-invoice (IRN) data, e-way bill records and GSTR-1/3B data from the same bill. Start free, no credit card.