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Invoicing Under GST



Updated on: Mar 22nd, 2024


6 min read

Invoicing is a crucial activity for any business, irrespective of type and size. Businesses should be careful while generating invoices as every transaction enters into books of accounts through this activity. Further, after introducing the Goods and Services Tax (GST), registered businesses must issue GST invoices, also known as GST bills.

This article explains everything about invoicing under GST, including what it is, who should issue it, mandatory fields, types of invoices, revised invoices, and invoicing under special cases

What is a GST invoice?

An invoice or a GST bill is a list of goods sent or services provided, along with the amount due for payment.

Who should issue GST Invoice?

If you are a GST registered business, you need to provide GST compliant invoices for sale of good and/or services.

Also, you should receive GST invoices from your vendors to claim the Input Tax credit (ITC).

What are the mandatory fields a GST Invoice should have?

A tax invoice is generally issued to charge the tax and pass on the ITC. A GST Invoice must have the following mandatory fields-

  1. Invoice number
  2. Invoice date
  3. Customer name
  4. Shipping and billing address
  5. Customer and taxpayer’s GSTIN (if registered)**
  6. Place of supply
  7. HSN code/ SAC code
  8. Item details i.e. description, quantity (number), unit (meter, kg etc.)
  9. Total value
  10. Taxable value and discounts
  11. GST rate and amount of taxes i.e. CGST/ SGST/ IGST
  12. Whether GST is payable on reverse charge basis
  13. Signature of the supplier

**If the recipient is not registered AND the value is more than Rs. 50,000 then the invoice should carry:

  • Name and address of the recipient
  • Address of delivery
  • State name and state code

Here is a sample invoice for your reference:

sample gst invoice

By when should you issue invoices?

The GST Act has defined time limit to issue GST tax invoice, revised GST bill, debit note, and credit note. Following are the due dates for issuing an invoice:

 due dates of GST invoices

What are other types of invoices?

a. Bill of supply

A bill of supply is similar to a GST invoice except for that bill of supply does not contain any tax amount as the seller cannot charge GST to the buyer. A bill of supply is issued in cases where tax cannot be charged:

  • Registered person is selling exempted goods/services,
  • Registered person has opted for composition scheme

Invoice-cum-bill of supply

As per Notification No. 45/2017 – Central Tax dated 13th October 2017 If a registered person is supplying taxable as well as exempted goods/ services to an unregistered person, then he can issue a single “invoice-cum-bill of supply” for all such supplies.

b. Aggregate invoice

If the value of multiple invoices is less than Rs. 200 and the buyer are unregistered, the seller can issue an aggregate or bulk invoice for the multiple invoices on a daily basis.

For example, you may have issued 3 invoices in a day of Rs.80, Rs.90 and Rs. 120. In such a case, you can issue a single invoice, totalling Rs.290, to be called an aggregate invoice.

c. Reverse charge invoice

A taxpayer liable to pay tax under Reverse Charge Mechanism (RCM) has to issue an invoice for goods or services or both received by him. The receiver shall mention the fact that the tax is paid under RCM. In addition, they have to issue a payment voucher while making payment to the supplier.

d. Debit and credit note

Debit and Credit note under GST

A debit note is issued by the seller when the amount payable by the buyer to seller increases:

  1. Tax invoice has a lower taxable value than the amount that should have been charged
  2. Tax invoice has a lower tax value than the amount that should have been charged

A credit note is issued by the seller when the value of invoice decreases:

  1. Tax invoice has a higher taxable value than the amount that should have been charged
  2. Tax invoice has a higher tax value than the amount that should have been charged
  3. Buyer refunds the goods to the supplier
  4. Services are found to be deficient

Can you revise invoices issued before GST?

Yes, you can revise invoices issued before GST. Under the GST regime, all the dealers must apply for provisional registration before getting the permanent registration certificate.

Below image explains the process of issuing a revised invoice:

Revised invoice under GST

This applies to all the invoices issued between the date of implementation of GST and the date your registration certificate has been issued.

As a dealer, you must issue a revised invoice against the invoices already issued. The revised invoice has to be issued within 1 month from the date of issue of the registration certificate.

GST invoicing under special cases?

In some cases, like banking, passenger transport, etc., the government has provided relaxation on the invoice format issued by the supplier.

How many copies of invoices should be issued?

  • For goods – 3 copies
  • For services – 2 copies

Number of GST invoice copies

How to personalize GST invoices?

You can personalize your invoice with your company’s logo. The ClearOne software allows you to create and personalize GST invoices at free of cost.

In 2020, the department implemented e-invoicing where B2B invoices shall be authenticated by GSTN. This move has impacted the invoicing process of the businesses.

Frequently Asked Questions

What’s the difference between invoice date and due date?

Invoice date refers to the date when the invoice is created on the bill-book, while the due date is when the payment is due on the invoice.

How to issue an invoice under reverse charge?

In case of GST payable under reverse charge, you must additionally mention that tax is paid on a reverse charge, on the GST invoice.

Is it mandatory to maintain an invoice serial number?

Yes, the invoice serial number must be maintained strictly. You may change the format by providing a written intimating the GST department officer along with reasons for the same.

Can I digitally sign my invoice through DSC?

Yes, you can digitally sign invoice through DSC. 

About the Author

DVSR Anjaneyulu, known by the name AJ, I've got a vast experience in accounting, finance, taxes and audit. I'm always keen to simplify laws for the readers and learn about the Indian finance ecosystem. I also love listening to music, travelling, and, most importantly, conversing with people to better understand the world.. Read more

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Quick Summary

Invoicing is crucial for businesses; under GST, invoice must include specific fields. Types include bill of supply, invoice-cum-bill of supply, aggregate invoice, reverse charge invoice, and debit/credit notes. Invoices issued before GST can be revised. Special cases have relaxation on invoice formats. Customize invoices with company logo. E-invoicing by GSTN has affected businesses.

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