Debit Note

A debit note is a document issued by a seller to a buyer to increase the amount payable on a previously raised invoice. It is also called a supplementary invoice under GST. Where an invoice undercharged the buyer, applied a lower tax rate than applicable, or additional goods were supplied after the original invoice was raised, the seller issues a debit note to correct the record and charge the additional amount. Under Section 34(3) of the CGST Act 2017, issuing a debit note increases the seller's output tax liability and allows the buyer to claim additional Input Tax Credit for the increased amount.

Quick reference

Also known as	Supplementary invoice, debit memo
Issued by	Seller or supplier
Purpose	Increases the value or tax on a previously issued invoice
Governed by	Section 34(3) of the CGST Act 2017
Also defined under	Section 2(38) of the CGST Act 2017
Reported in	GSTR-1, Table 9B
Effect on seller	Increases output tax liability
Effect on buyer	Buyer can claim additional ITC
Time limit to issue	No fixed limit, but must be reported in the GST return for the month of issuance
Serial number limit	Maximum 16 characters, consecutive for the financial year

How a debit note works

Here is how a debit note flows between a seller and buyer in a typical Indian GST transaction:

1. An invoice is raised but the value is less than it should be. A Mumbai electronics supplier sends a GST invoice for Rs. 80,000 to a Delhi retailer for 10 units at Rs. 8,000 each. The actual agreed price was Rs. 9,000 per unit. The invoice was undercharged by Rs. 10,000.

2. The seller identifies the shortfall and issues a debit note. The supplier issues a debit note for Rs. 10,000 plus the applicable GST, referencing the original invoice number and date. This debit note shows the additional amount the buyer now owes.

3. The seller's GST liability increases. The supplier must report this debit note in their GSTR-1 for the month it is issued. Their output tax liability in GSTR-3B increases by the GST amount shown on the debit note.

4. The buyer can claim additional ITC. Once the debit note is reported in the seller's GSTR-1, it appears in the buyer's GSTR-2B. The buyer can then claim the additional Input Tax Credit corresponding to the debit note.

5. The buyer pays the additional amount. The buyer now owes the additional Rs. 10,000 plus GST shown on the debit note, on top of the original invoice amount.

Debit note example for Indian businesses

Pradeep runs a packaging materials business in Pune. He supplies 500 carton boxes to a food company in Nashik and raises a GST invoice for Rs. 25,000 at 12% GST (Rs. 3,000 GST) totalling Rs. 28,000.

After delivery, the food company confirms that they actually received 550 boxes, 50 more than what was invoiced. Pradeep issues a debit note for the 50 extra boxes:

• Additional value: 50 boxes at Rs. 50 each = Rs. 2,500
• GST at 12% on Rs. 2,500: Rs. 300
• Debit note total: Rs. 2,800

Pradeep reports this debit note in his GSTR-1 for the current month. His output tax liability increases by Rs. 300. The food company in Nashik sees the debit note in their GSTR-2B and can claim Rs. 300 as additional ITC.

The food company now owes Pradeep Rs. 2,800 on top of the original Rs. 28,000.

When must you issue a debit note in India

Under Section 34(3) of the CGST Act 2017, a registered supplier must issue a debit note in the following situations:

• The original invoice undercharged the buyer. The taxable value declared in the tax invoice was less than the actual value of the goods or services supplied.
• A lower GST rate was applied than what is actually applicable. For example, 5% GST was charged on an item that attracts 12%.
• Additional goods were delivered after the invoice was raised. More units were shipped than what was invoiced, as in the example above.
• Additional charges arise after the invoice is issued. For example, freight charges, packaging costs, or handling fees that were not included in the original invoice and need to be recovered from the buyer.
• Buyer received more quantity than invoiced. The quantity delivered turns out to be more than what was declared in the original tax invoice.

What a debit note must contain

Under Rule 53(1A) of the CGST Rules 2017, a debit note must contain the following mandatory details:

• The word "Debit Note" clearly at the top
• Name, address, and GSTIN of the supplier
• A consecutive unique serial number not exceeding 16 characters for the financial year
• Date of issue
• Name, address, and GSTIN of the registered recipient, or address and state name for unregistered recipients
• Serial number and date of the original tax invoice against which the debit note is being issued
• Description of goods or services, HSN or SAC code
• Taxable value of the additional supply, applicable GST rate, and the additional CGST, SGST, or IGST amount
• Signature or digital signature of the supplier or authorised representative

Debit note vs credit note

This is the most common question asked about both these documents. Here is a clear comparison:

	Debit note	Credit note
Issued when	Invoice undercharged, underbilled, or additional supply	Invoice overcharged, goods returned, or post-sale discount
Effect on invoice value	Increases the amount buyer owes	Decreases the amount buyer owes
Effect on seller's GST	Increases output tax liability	Decreases output tax liability
Effect on buyer's ITC	Buyer can claim additional ITC	Buyer must reverse ITC already claimed
Governed by	Section 34(3) of CGST Act 2017	Section 34(1) of CGST Act 2017
Reported in GSTR-1	Table 9B	Table 9B

Simple rule to remember: A debit note increases what the buyer owes. A credit note decreases what the buyer owes. A debit note is good for the seller (more money coming). A credit note is bad for the seller (less money coming). Both are always issued by the seller, never by the buyer, under GST law.

How a debit note affects GST returns

For the seller

The debit note must be reported in GSTR-1 under Table 9B for the month in which it is issued. This increases the seller's total outward taxable supply for that month and increases the output GST payable in GSTR-3B.

For the buyer

Once the seller reports the debit note in GSTR-1, it automatically appears in the buyer's GSTR-2B. The buyer can then claim the additional Input Tax Credit corresponding to the debit note amount in their next GSTR-3B filing.

For e-invoicing businesses

If your business is covered under e-invoicing (turnover above Rs. 5 crore), debit notes must also be reported to the Invoice Registration Portal (IRP) for authentication, the same way regular tax invoices are handled.

Common debit note mistakes Indian businesses make

• Not issuing a debit note for underbilling. Many small businesses discover they undercharged a client but simply let it go or adjust it verbally. Under GST, this is incorrect. The underbilling must be formally corrected with a debit note, otherwise the seller is reporting lower output GST than they actually owe.

• Buyer issuing a debit note under GST. A common misconception is that the buyer issues a debit note when they want to return goods or dispute a charge. Under GST, only the supplier issues a debit note. If a buyer wants to communicate a price dispute or request for return, they send a commercial communication to the supplier, who then responds with the appropriate credit note or revised debit note.

• Confusing debit note with a purchase return document. In a purchase return scenario, the buyer sends back goods to the seller. The seller then issues a credit note, not a debit note. A debit note arises from the seller side when more money is owed, not from the buyer side when goods are returned.

• Not reporting it in the same month. While there is no fixed legal deadline for issuing a debit note document, Section 34(4) of the CGST Act requires that the details of a debit note be declared in the GST return for the month in which it is issued. Delaying reporting beyond the financial year creates compliance complications.

• Incorrect HSN code or GST rate on the debit note. Since a debit note corrects an underbilling, it is especially important that the correct GST rate and HSN code are applied. If the original invoice had the wrong rate, the debit note is an opportunity to correct it. Using the same wrong rate again perpetuates the error.

Frequently asked questions

What is a debit note in GST?

A debit note in GST is a document issued by a registered supplier when the taxable value or GST charged in the original tax invoice is less than the actual amount payable. It increases the seller's output tax liability and is treated like a supplementary invoice. The buyer can claim additional Input Tax Credit based on the debit note.

Who issues a debit note, the buyer or the seller?

Under GST law in India, only the seller or supplier issues a debit note. This is different from general accounting practice where buyers sometimes issue debit notes. In the GST framework, a debit note always comes from the supplier and always results in an increase in tax liability.

Is there a time limit for issuing a debit note under GST?

There is no prescribed time limit for issuing the debit note document itself. However, under Section 34(4) of the CGST Act, the details of the debit note must be reported in the GST return for the month in which it is issued. The debit note must be reported by 30th November of the following financial year or the date of filing the annual return, whichever is earlier.

Does a debit note increase the buyer's Input Tax Credit?

Yes. When a supplier issues a debit note, it appears in the buyer's GSTR-2B. The buyer can claim additional Input Tax Credit equal to the GST amount shown on the debit note. This is one of the reasons the debit note is treated like a supplementary invoice under GST.

What is the difference between a debit note and an invoice?

A tax invoice is issued for a fresh supply of goods or services. A debit note is issued to supplement or correct an existing invoice by increasing its value. A debit note always references an original invoice number and is never a standalone document. It is used only when the original invoice undercharged the buyer or when additional charges need to be recovered after the original invoice was issued.

Related terms

Credit Note · Tax Invoice · GST Invoice · Input Tax Credit · GSTR-1 · Accounts Receivable · Bill of Supply

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