GST invoice

Know about the GST Invoice: A Comprehensive Guide

Online Legal India LogoBy Online Legal India Published On 19 Nov 2025 Category GST

A GST invoice (Goods and Services Tax Invoice) is one of the most crucial official documents. This document records the details of every taxable sale under the Goods and Services Tax in India. Every GST-registered business should use the right GST invoice format in Excel or a standardised tax invoice format to stay compliant, organised, and to make audits. Whether you are a small seller or a growing enterprise, it is important to know about the GST tax invoice for smooth and transparent transactions. In this piece of writing, you will get step-by-step guidance on the GST invoice and more.

What is a GST Invoice?

A GST invoice refers to an officially recognised document issued by a GST-registered supplier to the buyer while supplying goods or services. It is also known as the GST bill. This document serves as proof or an officially acceptable document of a taxable transaction. It also incorporates all the required components of a GST invoice under Indian tax laws. However, it is essential for buyers to claim an Input Tax Credit (ITC) and guarantee tax compliance. It also records the time of supply to determine taxation under GST.  

Who must issue a GST Invoice?

Every business who are registered under the Central Goods and Services (CGST) Act should issue a GST-law compliant invoice for the sale of goods or services. It is also required to get GST tax invoices from their vendors to claim the Input Tax Credit (ITC).  

Mandatory Components of a GST Invoice

A registered supplier issues the tax invoice to charge the applicable tax and helps recipient to claim the Input Tax Credit (ITC). According to Rule 46 of the CGST Rules, 2017, a valid GST invoice must include the following components:

  1. Invoice number
  2. Date of Invoice
  3. Customer name
  4. Shipping and billing address
  5. Customer and taxpayer’s GSTIN (if registered)
  6. Place of supply
  7. HSN (Harmonized System of Nomenclature) code/ SAC (Services Accounting Code) code
  8. Details of the Item, such as description, quantity (number), unit (meter, kg, etc.)
  9. Total value
  10. Taxable value and discounts
  11. GST rate and amount of taxes such as Central Goods and Services Tax (CGST), State Goods and Services Tax (SGST), or Integrated Goods and Services Tax (IGST)
  12. Reverse charge applicability (If the GST is payable on the basis of reverse charge)
  13. Signature or digital signature of the supplier or the authorised signatory.
  14. If registered, the recipient’s details can include name, address, and GSTIN (Goods and Services Tax Identification Number).
  15. Place of supply and state code (in case of inter-state supplies)

However, optional fields like purchase order references, terms of delivery, or details of payments can also be included for internal or contractual purposes.

What are the timelines for the Issuance of a GST Invoice?

The timeline for issuing a GST invoice depends on the nature of the supply:

Goods (with movement): It can be issued on or before the date of removal for delivery.

Goods (without movement): In this type of goods, the GST invoice will be issued at the time of delivery. It can also be issued when the goods will be available to the recipient.

Services: In case of the general services, a GST invoice must be issued within 30 days from the date of supply.

Services (Banks and NBFCs): A GST invoice should be issued within 45 days from the date of supply. It is applicable for banks, financial institutions, and insurance companies.

Key Document Types under GST

There are various kinds of documents prescribed under GST that depend on the nature of the transaction:

Type of Document

Purpose

Tax Invoice

 

 

This is a mandatory document which must be issued by a registered supplier for the taxable supply of goods or services

Bill of Supply

 

 

It is a document issued by businesses in cases where tax cannot be charged. It is issued for exempt supplies or composition taxpayers

 

Receipt Voucher

 

This document is issued for advances received

 

 

Refund Voucher

 

It is useful for an advance refund against a cancelled supply

 

Debit Note

 

This document is needed to increase the taxable value or tax charged

 

Credit Note

 

It is used to eliminate taxable value or tax charged (for example, returns)

 

Delivery Challan

It is a kind of document which is useful for goods that are sent otherwise than by way of supply (For example, job work, samples, etc.)

 

What is the GST Invoice Format in Excel?

A GST invoice format consists of the particulars about the invoice as prescribed by the GST law. The details can include the list of services provided, quantity of goods, price, total payable amount, and tax rate. The formats can include:

B2B Invoice Format in GST

The B2B (Business-to-Business) model refers to exchanging goods and services between businesses. The B2B invoice format must include the required details as per Rule 46 of the CGST Rules, 2017, to be recognised under the GST regime in India. The details can include the GSTIN of both seller and recipient, HSN code, and so on.

B2C Invoice Format in GST

The B2C (Business-to-Consumer) model contains businesses selling goods or services directly to individual consumers for their own purpose. The B2C invoice format in GST provides the framework for the list of all sales details. The sales details can include price, quantity, total amount, and tax. It does not require the Goods and Services Tax Identification Number (GSTIN) of the recipient.

GST Invoice Penalties

If a registered business or individual fails to issue or incorrectly issues GST invoices, it can lead to severe penalties. In case of not issuing an invoice, the penalty will be Rs. 10,000 or 100% of the tax payable, which is higher. If they put the incorrect details of the invoice, then it can lead to Input tax credit (ITC) denial and additional penalties. The delayed issuance of invoices will attract interest on late tax payments. Moreover, the wrong classification of goods/services will result in additional tax liabilities and audits, which hamper the business operations.

Thus, all business are required to issue proper invoices, maintain accurate records, perform regular reconciliations, stay updated and so on to avoid the penalties of  the GST invoice.

Conclusion

A GST invoice allows businesses to stay compliant and secure smooth transactions. It generally helps with proper tax documentation and simplifies the filing process. Tools like the GST invoice format Excel help to manage invoices easily. Any business must meet the GST tax invoice requirements to avoid hassles for smooth business operations. If you need any type of assistance about it, contact Online Legal India.


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