The tax mistakes that cost Malaysians the most — and what LHDN actually does about them

Most Malaysians who get penalised by LHDN didn't cheat. They forgot a deadline, missed a Grab payout, or claimed a relief they weren't quite entitled to.

The system is unforgiving about that in a specific way: failing to file when you have taxable income is a criminal offence under the Income Tax Act 1967, even if you owe nothing.

1. Mistake: assuming you don't need to file

The rule: if your income exceeds RM34,000 after EPF deductions, you must file — even if your tax payable is zero.

People with modest incomes, part-year employment, or income that's fully covered by PCB deductions routinely skip filing on the assumption there's nothing to pay. That's not the test. The obligation is triggered by income level, not by tax owing.

Also caught out: people whose tax file was closed and who later resumed earning. If you start earning again after your file was closed, you need to reactivate or re-register with LHDN.

Consequence: failing to file when you have taxable income is a criminal offence, and enforcement action is possible even where no tax is due.

2. Mistake: forgetting side income

The single biggest growth area for LHDN enforcement, and the one most Malaysians get wrong.

All of this is taxable:

• Freelance work — design, writing, consulting, tuition
• e-hailing and delivery — Grab, Lalamove, food delivery
• Online selling — Shopee, Lazada, TikTok Shop, Instagram
• Rental income — including a room in your own house
• Part-time gigs and digital income

"It was cash" and "it was informal" don't change the position. Informal payments still count.

And LHDN can see more than people assume. It has data-sharing arrangements with local platforms, and it has run targeted operations — Ops Token in June 2024 specifically targeted undeclared digital asset activity. The move to e-Invoicing (below) expands that visibility considerably. See also: [Is Bitcoin legal in Malaysia?](/p/bitcoin-legal-malaysia-crypto-digital-currency-bank-negara)

The practical fix: keep a simple monthly record of every income stream, with dates and amounts. Reconstructing a year of Grab payouts in April is how mistakes happen.

3. Mistake: using the wrong form

More consequential than it sounds — the wrong form creates errors, penalties and audit exposure.

The common confusion:

• Form E is not Form EA. Issuing EA forms to staff doesn't discharge the employer's own Form E obligation. They're separate.
• If you have any business or freelance income, you file Form B, not BE — even if most of your income is salaried.

Non-residents are taxed at a flat 30% with no reliefs or deductions.

4. Mistake: over-claiming reliefs

Reliefs are where honest people get into trouble, because the rules are more specific than the summaries suggest.

Rules that catch people:

• Keep every receipt for seven years. LHDN can request substantiation long after filing.
• Claim only what you actually spent and what qualifies under that specific relief category.
• Don't double-claim the same expense across two relief categories.
• Check the sub-limits. Many reliefs have caps within caps.
• Spouse and child reliefs have specific conditions — don't assume.

The failure mode is an audit. A relief claimed in good faith but without a receipt becomes an underpayment plus penalty.

5. Mistake: missing the deadline

The most common issue for employees, and the most avoidable.

What it costs:

• Late filing penalty: a fine of RM200 to RM20,000, imprisonment up to six months, or both — the amount at LHDN's discretion
• Late payment: 10% surcharge on unpaid tax, plus a further 5% if still unpaid after 60 days — 15% total
• For those with business income, late filing penalties are described in some guidance as reaching up to 45% of unpaid taxes

A worked example: a RM5,000 tax bill can attract an additional RM1,000 penalty.

And a second-order effect people don't anticipate: late filers attract closer scrutiny. An audit that surfaces other discrepancies — even unintentional ones — produces further penalties on top.

Tax compliance also shows up elsewhere. Housing loan applications, visa applications and some senior appointments involve tax compliance checks. A history of late or missing filings creates friction years later.

6. Mistake: underestimating tax payable (CP204)

This one applies to businesses and individuals with business income.

Under the CP204 system, taxpayers estimate their tax payable in advance. Underestimating attracts its own penalty, separate from late filing or late payment.

The fix: revise your estimate when your circumstances change materially, rather than leaving an optimistic figure in place all year.

7. What changed in January 2026: e-Invoicing

If you run any kind of business, this is the biggest practical change and it's recent enough that most guidance online is out of date.

Where things stand:

• Phase 1 (Aug 2024) — turnover above RM100 million
• Phase 2 (Jan 2025) — RM25m to RM100m
• Phase 3 (Jul 2025) — RM5m to RM25m
• Phase 4 (1 Jan 2026) — RM1m to RM5m, with a relaxation period extended to 31 December 2027

The exemption threshold was raised. The Cabinet increased the permanent exemption from RM500,000 to RM1,000,000 turnover, effective 1 January 2026 — and the planned Phase 5 covering RM150k–RM500k businesses was cancelled.

So: if your annual turnover is below RM1 million, you are exempt — though you can opt in voluntarily, which some do because larger customers want validated e-invoices.

But note two things:

• Exemption isn't automatic — LHDN MSME criteria apply
• If you cross RM1 million in a later year, you must comply from the second year after crossing
• For sole proprietors, revenue from all businesses you own is added together

From 1 January 2026, individual e-invoices are mandatory for transactions above RM10,000. Consolidated invoices are no longer permitted for those amounts.

Penalties: failure to issue a valid e-invoice is an offence under section 120(1)(d) of the Income Tax Act 1967 — fines up to RM20,000, imprisonment up to six months, or both.

Three submission channels: the free MyInvois Portal at myinvois.hasil.gov.my (manual, suited to low volume), integrated accounting software (most SME packages now support it), or direct API/PEPPOL for high volume.

Check the current LHDN e-Invoice Specific Guideline before relying on any of this — the guidance has been revised repeatedly, and the version current in April 2026 superseded earlier ones.

8. Mistake: ignoring LHDN correspondence

A notice that gets filed in a drawer turns a minor issue into a formal enforcement matter.

If you receive anything from LHDN: open it, note the deadline, and respond. Even if you can't pay, engaging is materially better than silence.

What to actually do

If you haven't filed yet:

• File immediately, even if late. The penalty grows with delay.
• Pay whatever you can to stop the surcharge compounding.
• Then appeal. Submit a penalty reduction appeal via MyTax or in person at an LHDN branch. LHDN considers appeals case by case with a valid reason — approval isn't guaranteed, and appeals usually have their own timeframe.

If you've found a mistake in a filed return:

• Amend it. There are mechanisms to correct returns, and self-correction is treated far better than an error found in an audit.
• For employers who've issued a wrong Form EA, LHDN's e-Data Praisi on MyTax handles corrections.

Every year:

• Keep a monthly income log across all sources.
• Keep receipts for seven years, digitally.
• Reconcile your EA form against your own records before filing.
• File early. The system slows near the deadline, and mistakes multiply under time pressure.

If you're running a business:

• Work out which e-Invoice phase you're in, or whether you're under the RM1 million exemption.
• Remember sole proprietors aggregate revenue across all their businesses.

For most first-time genuine mistakes, LHDN's response tends to be administrative rather than criminal. Persistent non-compliance is a different matter entirely.