What is the correct GST invoice format in India?

A GST invoice must include: supplier name/address/GSTIN, buyer name/address/GSTIN, invoice number and date, HSN/SAC code, description, quantity, taxable value, GST rate and amount (CGST/SGST or IGST), place of supply, and total value. These are mandated under Rule 46 of CGST Rules.

Can I use my own GST invoice format?

Yes. The GST law does not prescribe a fixed template — only the mandatory fields. As long as all required fields are present, you can use any format. However, using a pre-built compliant template avoids missing fields.

What is HSN code and is it mandatory on GST invoice?

HSN (Harmonized System of Nomenclature) is a code that classifies goods for GST purposes. It is mandatory for businesses with turnover above ₹5 crore (6-digit HSN) and above ₹1.5 crore (4-digit HSN). Below ₹1.5 crore it is optional but recommended.

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

A tax invoice is issued by GST-registered businesses for taxable supplies and shows the GST charged. A bill of supply is issued for exempt supplies or by composition scheme dealers who cannot charge GST.

How many copies of GST invoice should be made?

For goods: 3 copies — Original for buyer, Duplicate for transporter, Triplicate for supplier. For services: 2 copies — Original for recipient, Duplicate for supplier.

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Free GST Invoice Format — Excel & PDF Templates 2026

Download ready-to-use GST invoice templates with all mandatory fields pre-filled. Compliant with latest GST Council rules. No signup required.

Standard GST Invoice

Best for: Retailers, traders, manufacturers

Fields included: All mandatory GST fields

Formats: Excel, PDF

Service Invoice

Best for: Freelancers, consultants, agencies

Fields included: SAC code, service description, TDS section

Formats: Excel, PDF

Proforma Invoice

Best for: Export businesses, advance payments

Fields included: Proforma number, validity date, payment terms

Formats: Excel, PDF

What every GST invoice must include (Rule 46, CGST Rules)

Supplier's name, address, and GSTIN

Consecutive invoice number (max 16 characters)

Date of issue

Buyer's name, address, and GSTIN (B2B)

HSN code (goods) or SAC code (services)

Description of goods or services

Quantity and unit of measurement

Taxable value before GST

Applicable GST rate

CGST and SGST amounts (intra-state)

IGST amount (inter-state)

Place of supply (state name + code)

Total invoice value in figures and words

Supplier signature or digital signature

Understanding GST Invoice Formats

A GST invoice acts as the definitive legal proof of a transaction involving goods or services. It is essential not only for demanding payment from your clients but also for claiming Input Tax Credit (ITC). If your invoice formula is flawed or lacks mandatory details like the 16-character alphanumeric invoice number or HSN codes, your buyer may be denied ITC, eroding their trust in your business.

Tax Invoice vs Bill of Supply vs Proforma Invoice

A Tax Invoice is issued when you supply taxable items and legitimately collect GST. In contrast, a Bill of Supply is used for exempt goods (like fresh milk or vegetables) or if you are registered under the Composition Scheme and cannot charge tax. A Proforma Invoice is simply a preliminary bill or an estimated quotation sent to an international or domestic buyer before the actual delivery to trigger an advance payment.

How Many Copies Do You Need?

For the supply of goods, the law strictly mandates 3 copies: the Original for the buyer, the Duplicate for the transporter handling the delivery, and the Triplicate for you (the supplier). For services, only 2 copies are needed since there is no physical transport: the Original for the recipient and the Duplicate for your own records.

Why Switching from Excel to Udyog is Essential

Using an Excel template means configuring complex formulas manually, tracking serial numbers yourself, and facing extreme difficulty when auditing time arrives. If you miss a field or calculate CGST/SGST incorrectly on an IGST invoice, the penalties can be steep. Udyog Billing Software permanently eliminates this risk. It generates picture-perfect, 100% compliant GST invoices automatically in just 8 seconds, securing your compliance and preserving your peace of mind.

Manual Template vs Udyog

Feature	Manual Excel Template	Udyog Software
GST calculation	Manual, error-prone	Automatic
CGST/SGST/IGST split	You calculate	Auto-detected by state
Invoice numbering	Manual tracking	Auto-sequential
Customer database	Re-enter every time	Saved, one click
WhatsApp sharing	Download then share	One click share
GSTR-1 report	Compile manually	Auto-generated
Time per invoice	3–5 minutes	8 seconds
Price	Free	Free (paid from ₹149/year)

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Why use a template when Udyog does it automatically?

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