E-Invoicing Malaysia: How an E-Invoice Credit Note and Refund Note Work
Introduction
Once LHDN validates a sales e-invoice, it becomes a locked tax record. Returns, discounts, overcharges and cash refunds then have to be recorded through a separate document, and choosing the wrong one leaves gaps in your audit trail. At QR Retail Automation (QRRA), we see this most often at retail counters, where a return needs compliant e-invoice credit note workflows or a refund note within minutes.
This guide explains how credit notes, refund notes and debit notes work in the MyInvois System, when the 72-hour cancellation window applies, and how multi-store retailers and B2B businesses can keep every adjustment linked to its original e-invoice.
Article Summary
An e-invoice credit note reduces the value of a validated e-invoice when no money goes back to the buyer, while a refund note records money actually returned. Both must quote the original e-invoice's Unique Identifier Number. Within 72 hours of validation the supplier can cancel instead; after that, only a credit, debit or refund note can correct it.
Credit notes cover returns, post-sale discounts and overcharges where no cash changes hands.
Refund notes are needed for returned money, except overpayments, wrong payments and deposits.
Debit notes add charges when the original e-invoice was undercharged or incomplete.
One credit, debit or refund note can adjust several e-invoices, including consolidated ones.
What Is the Difference Between a Credit Note, Refund Note and Debit Note?
A credit note lowers the value of a validated e-invoice without returning money to the buyer. A refund note confirms that money has gone back to the buyer. A debit note adds charges to a previous e-invoice. LHDN treats all three as separate e-invoices, each validated through MyInvois and linked to the original transaction.
These definitions come from the MyInvois SDK document types published by LHDN, which also sets out self-billed versions of each note for cases where the buyer issues the e-invoice.
Table 1: How credit notes, refund notes and debit notes differ under MyInvois.
Feature | Credit note | Refund note | Debit note |
Effect on the original e-invoice | Reduces its value | Records money returned to the buyer | Increases its value |
Money returned to the buyer | No | Yes | No |
Typical trigger | Return credited to account, rebate or overcharge | Cash, card or e-wallet refund, or a cancelled prepaid order | Undercharge or additional charges |
Quotes the original Unique Identifier Number | Yes | Yes | Yes |
Can You Cancel an E-Invoice Instead of Issuing a Credit Note?
Yes, but only within 72 hours of validation. During that window the supplier can cancel the e-invoice and submit a corrected one, and the buyer can request a rejection that the supplier then accepts. After 72 hours the e-invoice stays valid, and any correction needs a credit, debit or refund note.
The sequence works like this:
LHDN validates the e-invoice and assigns its Unique Identifier Number.
For 72 hours, the supplier can cancel it, or the buyer can request a rejection with a reason.
If the supplier accepts a rejection, the supplier cancels the e-invoice and reissues it.
Once 72 hours pass, the e-invoice is final and adjustments go through a new note.
A rejection request does not cancel anything on its own. If the supplier does not act on it, the e-invoice becomes final when the window closes, as set out in LHDN's e-Invoice General FAQs, updated 4 September 2026.
When Should You Issue an E-Invoice Credit Note?
Issue an e-invoice credit note when the value of a validated sale falls and the buyer is not paid back. Typical cases are returned goods credited to the buyer's account, retrospective volume rebates, early settlement discounts and billing errors such as a wrong unit price or pricing tier on the original e-invoice.
Common credit note scenarios
Goods returned: a B2B customer sends back damaged or incorrect stock, and the value is credited to their account.
Post-invoice discounts: volume rebates or early settlement discounts are agreed after validation.
Billing overcharges: the wrong pricing tier or unit rate was used on the original e-invoice.
What a credit note must include
Original e-Invoice Reference Number: the Unique Identifier Number of every e-invoice being adjusted.
Document type: marked as a credit note, so MyInvois validates it against the right structure.
Reason for the adjustment: a short, clear description of why the value changed.
Tax breakdown: Sales and Service Tax (SST) adjusted at the same rates as the original line items.
When Is a Refund Note E-Invoice Required?
A refund note e-invoice is required whenever money goes back to the buyer, such as a cash, card or e-wallet refund for returned goods or a cancelled prepaid order. LHDN lists three exceptions in its General FAQs: payments made wrongly by buyers, overpayments by buyers and the return of security deposits.
Common refund note scenarios
In-store returns: a shopper returns an item and is refunded by cash, card or e-wallet.
Cancelled prepaid orders: a customer pays upfront for goods or services, then cancels within the agreed terms.
How to process a compliant refund note
Find the original: the POS or ERP locates the individual or consolidated e-invoice being refunded.
Submit to MyInvois: the refund note data is sent to LHDN through the API.
Receive validation: LHDN returns a new Unique Identifier Number and a QR code for the refund note.
Pay and reconcile: finance releases the funds and matches the bank reference to the validated refund note.
How do refunds work with consolidated e-invoices?
Many retail sales sit inside a monthly consolidated e-invoice, because most shoppers never ask for their own. LHDN's FAQs confirm that credit, debit and refund notes can adjust consolidated e-invoices, and that one note can cover several original e-invoices as long as each Unique Identifier Number is listed. Our guide to B2C transactions and consolidated e-invoices explains how those monthly submissions are built.
What Challenges Do Retailers Face With Returns and Credit Notes?
High transaction volumes make post-sale adjustments hard to manage by hand. Retailers have to trace each return back to the right e-invoice, often a monthly consolidated one, submit the note without slowing the checkout, and keep SST filings in line with declared revenue. Table 2 sets out where the risk sits.
The scale is large. Since e-invoicing began on 1 August 2024, 265,379 taxpayers had submitted more than 1.84 billion e-invoices, according to an LHDN statement reported by Bernama in August 2026.
Table 2: Common operational challenges when handling e-invoice returns and adjustments.
Operational challenge | Risk or impact | Solution requirement |
High POS transaction volume | Bottlenecks at the checkout while product returns are processed | Fast API middleware connecting the POS directly to LHDN MyInvois |
Refunds against consolidated e-invoices | Reconciling B2C till returns against monthly consolidated submissions | Automated POS logic that cross-references store receipts to batch e-invoices |
Tax return discrepancies | Mismatches between SST filings and gross revenue declarations | Two-way ERP sync so credit notes update SST reporting automatically |
QRRA connects its retail POS system and ERP platforms to MyInvois through AgoraCloud E-Invoice (ACE). ACE checks each document for errors before it reaches LHDN, and finds and matches the original e-invoice when staff issue a refund or credit note:
Middleware integration: existing POS and ERP systems submit invoices, credit notes and refund notes to LHDN through APIs.
Automated return workflows: returns are linked to original e-invoices, with approval steps and line-item SST checks.
B2B and B2C coverage: individual e-invoice requests, consolidated e-invoices and multi-store returns are handled in one place.
Frequently Asked Questions
1. Can I edit an e-invoice after it has been validated?
No. A validated e-invoice cannot be edited. Within 72 hours of validation, the supplier can cancel it and submit a corrected version. After 72 hours, the e-invoice is final, and any change in value has to go through a credit note, debit note or refund note that quotes the original e-invoice's Unique Identifier Number in the reference field.
2. Is a refund note needed when a customer overpays?
No. LHDN's General FAQs exclude overpayments by buyers from the refund note requirement, together with payments made wrongly by buyers and returned security deposits. Keep records of the payment received and the refund made, so the money can still be traced during an audit even though no refund note e-invoice is issued.
3. Can one credit note cover several e-invoices?
Yes. LHDN allows a single credit note, debit note or refund note to adjust several original e-invoices, including consolidated e-invoices. The note must list the Unique Identifier Number of each e-invoice it adjusts in the Original e-Invoice Reference Number field. This suits monthly rebates that apply across many deliveries to the same B2B customer.
4. What happens if a buyer rejects an e-invoice?
The buyer can request a rejection within 72 hours of validation and must give a reason. The rejection only takes effect if the supplier accepts it and cancels the e-invoice within the same window. If the supplier does not act, the e-invoice remains valid, and any later correction needs a credit, debit or refund note.
5. Do businesses below RM3 million still deal with credit notes?
LHDN announced in August 2026 that, from 1 September 2026, businesses with annual sales below RM3 million are exempt from mandatory e-invoicing, up from RM1 million, though they can still take part voluntarily. Larger suppliers will keep issuing credit and refund notes to them, so finance teams at smaller firms should still recognise these documents and their reference numbers.
Conclusion
Credit notes, refund notes and debit notes each have one job: lowering a sale's value, recording money returned or adding charges. Choosing the right one, and linking every note to its original e-invoice, keeps SST reporting accurate and audits straightforward. QRRA builds these workflows into the POS and ERP systems retailers already use. To see how it would work across your stores, speak to our team and book a demonstration.
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