Last checked 2026-10-12.

E-invoicing in Malaysia and Singapore: what SMEs need to do now (2026)

E-invoicing has moved from a big-company project to an SME question in both countries. In Malaysia, the rules for smaller businesses changed again in August 2026. In Singapore, the GST InvoiceNow requirement now has dates for every GST-registered business. If you run a family or founder-led business in either country, here is who is in scope, what the key rules are, and how to get ready without a big systems project.

This is general information, checked on 12 October 2026. Rules change often: confirm your own position with your tax adviser and the official guidelines linked below.

Malaysia: MyInvois

What it is. Each invoice is submitted to the Inland Revenue Board (LHDN) through the MyInvois Portal or through software connected to its API. LHDN validates it and gives it a unique identifier and a validation link (shown as a QR code on the invoice you send).

Who is in scope. The phases ran by annual turnover:

The big change for SMEs: businesses with annual turnover or revenue below RM3 million are exempt under LHDN's General Guideline version 4.8 (30 August 2026), up from RM1 million. The exemption does not apply if a holding company, related company or joint-venture partner has revenue of RM3 million or more, so check the group, not just your own company.

Relaxation until the end of 2027. For the last phase, LHDN allows consolidated e-invoices (one monthly e-invoice covering many transactions), submitted within 7 days after the month ends, until 31 December 2027. Penalties for not issuing e-invoices (RM200 to RM20,000 per offence under section 120(1)(d) of the Income Tax Act 1967) are enforced from 1 January 2028.

Three rules that catch people out:

1. Cancellation has a 72-hour window. You can cancel a validated e-invoice only within 72 hours of validation, and the buyer must accept the cancellation. After that, you correct it with a credit note, debit note or refund note.
2. Notes must point to the original. A credit, debit or refund note references the original e-invoice's unique identifier, with the same buyer and supplier details. A negative invoice is not a credit note.
3. You need your buyers' tax details. For business buyers that means their tax identification number (TIN) and registration number. For the general public, LHDN provides a general TIN; check the current code list in the guideline.

Some situations require a self-billed e-invoice, where the buyer issues the e-invoice on the supplier's behalf (for example, certain payments to agents or foreign suppliers). The guideline lists when; check it before you pay such suppliers.

Official source: LHDN e-Invoice.

Singapore: GST InvoiceNow

What it is. GST-registered businesses send prescribed invoice data to IRAS through an IMDA-accredited InvoiceNow-Ready solution, which uses the Peppol network. You register for a Peppol ID linked to your UEN.

Who is in scope, and when.

What you send. Invoice data from tax invoices, simplified invoices, receipts, and debit and credit notes, sent by the earlier of the date you file the GST return or its due date. Businesses that account for GST only under reverse charge, and overseas vendors under the OVR regime, are excluded.

Official source: IRAS GST InvoiceNow requirement.

Why this matters even if you're exempt

Your customers may not be. A larger customer in scope in Malaysia needs your TIN and correct details to receive a valid e-invoice from you, and may prefer suppliers who can issue one. In Singapore, your date is now fixed, even if it is 2029 or 2030. Getting your customer records and invoicing process in order now costs a few hours; doing it in the month before your start date costs much more.

A 12-step readiness checklist

1. Confirm whether you are in scope and your start date (check the group's turnover in Malaysia).
2. Record your own tax IDs: TIN, BRN, SST number and MSIC code (Malaysia); UEN, GST number and Peppol ID (Singapore).
3. Collect the TIN and registration number of every business customer.
4. Collect supplier TINs, and decide when self-billing applies to you.
5. Choose your route: the MyInvois Portal for low volumes, or invoicing software connected to MyInvois or InvoiceNow.
6. Map your tax, classification and unit codes.
7. Set a policy for consolidated e-invoices for walk-in or online consumers.
8. Set the process for credit notes, debit notes, refunds and cancellations (the 72-hour window in Malaysia).
9. Update your invoice template: unique ID, validation link or QR code, both parties' tax IDs.
10. Test in the sandbox, including a credit note and a foreign-currency invoice.
11. Write the procedure down and train whoever issues invoices.
12. Each month, reconcile the portal's totals to your accounts.

How Mula OS helps

Mula OS's Quotes, Invoices & Collections workbook (in Mula OS Operate) now includes an e-invoice register (status, unique ID, the cancellation window and credit notes against their originals), a customer tax-ID list that flags missing TINs, and this 12-step checklist with owners and dates. The Tax & Compliance Calendar adds the e-invoicing deadlines next to your other filings, and the SOP Library has a starter procedure for issuing, cancelling and crediting e-invoices.

Not sure which stage your business is at overall? Start with the free Corporate Readiness Assessment.

Sources: LHDN General Guideline v4.8 as summarised by JomeInvoice and ClearTax; credit-note rules as summarised by KC Group; IRAS InvoiceNow timeline as summarised by Hawksford. Checked 12 October 2026.

Take the free readiness assessment