LHDN e-Invoice Integration for Your Existing System
31 August 2026 · 7 min read
LHDN's e-invoicing (MyInvois) requires many businesses to submit invoices to the tax authority electronically. If you already run a POS, ERP or custom system, you do not want to re-key every invoice into a separate portal. This is a plain-English guide to connecting your system to MyInvois.
Do you even need to?
First, check whether you are in scope. As of 1 January 2026, LHDN raised the exemption threshold to RM1,000,000 in annual turnover — businesses below that are currently excused. One catch: if your company is owned by, or is a subsidiary of, a larger group above RM1 million, you do not get the exemption and must comply from 1 July 2026. So a lot of small businesses do not need to do anything yet. If you are above the threshold (or want to be ready), read on. Always check the latest LHDN guidance, as thresholds and dates change.
Your three options
| Option | Good for | Trade-off |
|---|---|---|
| The free MyInvois portal | Very low volume | Manual re-keying of every invoice |
| Accounting software with e-invoice built in | If you already use SQL, AutoCount, etc. | You have to use their software |
| Integrate your own system | You have a POS/ERP/custom app | Needs a one-time integration build |
What integrating actually involves
Connecting your system to MyInvois means your software builds each invoice in LHDN's required format, submits it through the API, and stores the result. The moving parts:
- The document format. Each invoice must be structured the exact way MyInvois expects, including tax categories and classification codes.
- Validation & submission. The invoice is validated and sent to LHDN, which returns an accepted/rejected status and a QR code.
- Edge cases. Credit notes, debit notes, self-billed invoices, and consolidated invoices each have their own rules.
Two gotchas worth knowing
- Self-billing got heavier. When a business in scope buys from an exempt supplier, the buyer often has to self-bill — which increases the integration work if you deal with many small suppliers.
- The RM10,000 rule. Since 1 Jan 2026, a single transaction above RM10,000 generally cannot be lumped into a monthly consolidated invoice — it needs its own e-invoice.
We have actually built this
We designed and built EasyInvois, a full LHDN e-invoicing SaaS — validation against the MyInvois format, PDF and QR generation, self-billed and consolidated invoices, credit/debit notes, the lot. So wiring an existing POS or ERP into MyInvois is the same problem we have already solved end to end for our own product — not something we have only read about.
If you need your own system connected to MyInvois, tell us what you run and we will map out the cleanest path.