What is a debit note?

In the United States the same seller-issued document is usually called a debit memo. It increases the amount a customer owes on an earlier invoice, for example when goods were under-billed or an agreed charge was left off, and it should reference that invoice.

Banks also use the term debit memo for a charge posted to a bank account. That is a different record: it explains a bank deduction, not an adjustment to a customer invoice.

• Same purpose: an authorised increase to an earlier invoice.
• Same fields: number, date, original reference, reason and amount.
• Not the same as a bank's debit memo on an account statement.

Use the fields in the debit note format.

Under GST in India, section 34 of the CGST Act provides that where the taxable value or tax charged on a tax invoice is found to be less than the taxable value or tax payable on the supply, the registered supplier issues a debit note to the recipient. The supplier declares the debit note in its return for the month in which it was issued. The Act also treats a supplementary invoice as a debit note.

Confirm the current rules and reporting for the actual transaction on the official source. Where e-invoicing applies, debit notes are among the documents reported to the IRP.

• Issued by: the registered supplier.
• Trigger: value or tax on the original invoice was too low.
• References: the original tax invoice.
• Reported: in the supplier's return for the month of issue.

See how GST invoice fields are set up in GST invoicing.

A sales return is the seller's view of goods coming back. The seller reduces what the customer owes by issuing a credit note against the original invoice, so a sales return is recorded with a credit note.

A purchase return is the same event seen from the buyer's side. Many buyers send the supplier a debit note with the returned goods to say they are reducing the amount they owe. Under GST, the document that adjusts the supplier's tax on a return is the supplier's credit note: section 34 lists goods returned by the recipient as one reason for it.

The two documents describe one event from opposite sides. Link both to the original invoice so the return is not counted twice.

• Sales return (seller's side): credit note.
• Purchase return (buyer's side): commonly a debit note to the supplier.
• GST adjustment for a return: the supplier's credit note.
• Both refer to the same original invoice.

For the credit note vs debit note comparison, see the credit note entry.

A debit note arises when an authorised process needs to increase an amount, document a short charge or record another debit-side correction against a prior transaction. Confirm who must issue it and which original invoice, purchase or tax record it adjusts.

Start with the underlying commercial or statutory event rather than the label placed on a document or report. Record the parties, date, period, amount basis, source and responsible owner so another reviewer can reproduce why the state exists.

• Name the event and effective date.
• Retain the source and calculation.
• Identify the accountable owner.
• Keep later changes traceable.

Put this into practice with what is an invoice.

Identify the original document, confirm the adjustment reason and issuer direction, calculate the difference, apply current tax requirements and issue a controlled number and date. Keep both original and adjustment visible to the customer and responsible reviewers.

Work from source evidence to classification, calculation, review and final record in that order. A familiar label or precise number does not correct a missing source, wrong period, unsupported assumption or unauthorised change.

• Collect the source records.
• Confirm scope and classification.
• Calculate with visible assumptions.
• Review and retain the result.

Put this into practice with credit note format.

Keep the debit note separate from the original invoice it adjusts and from a new invoice for a new supply. A debit note changes an amount already billed; a fresh supply needs its own invoice. The label alone cannot establish what the recipient owes, so state the issuer, the original reference and the direction of the adjustment. The credit note entry covers how the two notes compare.

Related records can share amounts while proving different things. State whether a value represents an authorised order, delivered work, outgoing invoice, customer balance, payment instruction, verified cash event, tax report or ledger conclusion before using it in another process.

• Intent is not delivery.
• An invoice is not cash.
• A payment notice is not settlement.
• Billing evidence is not a ledger conclusion.

Put this into practice with invoice management.

The example demonstrates the sequence and arithmetic, not a universal legal, tax or accounting treatment. Replace every assumption with the facts and current rules that apply to the actual transaction.

A reviewer should be able to move from the final number back to each source record without reconstructing the decision from email or memory.

• Original taxable value: ₹100,000
• Authorised upward correction: ₹5,000
• Revised commercial basis: ₹105,000 before applicable tax
• Adjustment links to the original invoice

Put this into practice with Glossary.

Check the parties, direction, relevant period, source completeness, classification, currency, arithmetic, status and approval. Where a law, filing or accounting policy controls the outcome, use the current official source or the responsible qualified reviewer.

Correct the record through the appropriate controlled process. Do not silently overwrite an issued document, change a historical status without explanation or present an illustrative value as though it were verified evidence.

• Wrong issuer direction
• No reference to original document
• Silent change to issued invoice
• Tax treatment assumed from the label alone