“When Should I Submit My Company’s Form C?”
Business owners in Malaysia often ask this question during tax season. The answer matters because you can’t skip Form C — it’s the corporate income tax return that every company must file with LHDN (Inland Revenue Board of Malaysia).
If you don’t meet the deadline, you might have to pay big fines, deal with an audit, and lose sleep over it. This applies to both business owners and their finance teams.
Here’s what you should know about Form C tax filing in Malaysia for 2026:
- What Form C is and who has to file it
- Important dates for paper and online filing
- Mistakes to avoid
- How e-Invoicing and software can help you comply
Form C in Malaysia must be submitted within 7 months after the financial year-end (FYE) for manual filing and 8 months for e-Filing. For example, if your FYE is 31 December 2025, your deadline is 31 July 2026 (manual) or 31 August 2026 (e-Filing).
What Is Form C in Malaysia?
Form C is the corporate income tax return that:
- Malaysia-based and foreign companies (Sdn Bhd, Berhad, etc.) must turn in
- Every business under Malaysia’s self-assessment system needs to file
Companies use Form C to:
- Report their annual taxable income
- Hand in audited financial statements
- Calculate and declare the tax they owe
In Malaysia, Form C acts as the corporate income tax return that businesses must give to LHDN. It reports taxable income and pays corporate tax under the self-assessment system
Form C Tax Filing Deadlines in Malaysia (2026)
Deadlines change based on a company’s financial year-end (FYE).
| Financial Year End (FYE) | Manual Filing Deadline | e-Filing Deadline |
|---|---|---|
| 31 Dec 2025 | 31 July 2026 | 31 Aug 2026 |
| 30 June 2025 | 31 Jan 2026 | 28 Feb 2026 |
Most companies in Malaysia are required to submit Form C via e-Filing (e-C) through the MyTax portal. The additional one-month extension is generally granted for e-Filing submissions.
Steps to Get Ready for Form C Filing (2026)
To file:
1. Accurate Financial Statements – Profit & loss, balance sheet, notes
2. Tax Calculation – Expenses you can subtract, exemptions, incentives you apply
3. Supporting Documents – Invoices, receipts, contracts, schedules
4. Review & Verify – Internal checks to prevent reporting errors
-
Tax computation format (adjusted income → statutory income → chargeable income)
-
CP204 instalment reconciliation
-
Deferred tax considerations (for larger companies)
Penalties for Submitting Form C Late or With Errors
Missing deadlines or making mistakes costs a lot:
-
Late filing penalty: Up to 45% of tax payable (Section 112(3), Income Tax Act 1967)
-
Additional penalty for continued delay: Further 10% after 60 days
-
Incorrect return penalties: Up to RM20,000 or imprisonment (serious cases)
E-Invoicing & Form C Rules in 2026
As of 2026, e-Invoicing adoption continues in phases, with mandatory implementation depending on annual turnover thresholds. Businesses above RM1 million must comply, while smaller businesses may be exempt based on the latest LHDN guidelines. You must send all invoices through LHDN’s MyInvois platform.
How this affects Form C:
- Verified digital invoices have an impact on tax computations
- This results in fewer errors when reporting income
- It provides more clarity to LHDN during audits
How Info-Tech E-Invoicing Software Helps
At Info-Tech, we provide a Peppol-Ready Solution that links to LHDN’s MyInvois system.
Our platform ensures your company:
- Generates and transmits e-invoices
- Syncs financial data in real-time for Form C
- Monitors compliance through automatic alerts
- Prepares tax reports for audits
Try Info-Tech’s E-Invoicing Software and stay ahead of deadlines.
Common Issues Companies Face with Form C
|
Mistake |
Impact |
|
Missing filing deadline |
10–45% late penalties |
|
Incorrect tax computation |
Extra taxes + audits |
|
Not adopting e-Invoicing |
Non-compliance, system fines |
|
Incomplete supporting documents |
Deductions rejected |
|
Manual processes (Excel) |
Human errors, delays |
Avoid these by switching to digital tools.
To Sum Up
Form C submission goes beyond rule compliance — it’s a legal requirement that protects your company from penalties and ensures you follow Malaysia’s self-assessment tax framework.
Time’s running short and e-Invoicing is now a must so manual processes are too risky.
The wiser option? Info-Tech’s E-Invoicing & Tax Software:
- Works, and in line with regulations
- Connects to LHDN’s MyInvois system
- Simplifies your company’s tax season
Check Out a Demo Now to ensure your business is tax ready.
Frequently Asked Questions:
What’s Form C in Malaysia?
Form C has an impact on how companies report their taxable income to LHDN. It shows how much tax they need to pay.
When is Form C due in 2026?
For manual submission: you have 7 months after FYE to submit. For e-filing: you get 8 months after FYE (if you qualify).
What happens if you submit Form C late?
You’ll face fines ranging from 10% to 45% of your tax bill. LHDN might also audit you and give you extra fines.
How does e-Invoicing change Form C filing?
Starting August 2024, you must issue all invoices through LHDN’s MyInvois system. This has an impact on how you report revenue for Form C.
How can businesses make Form C compliance easier?
Businesses can use e-Invoicing software like Info-Tech’s. This software has an influence on automating invoice creation, tax calculations, and monitoring compliance.