Retention Sum in Construction Projects in Malaysia: A Practical Guide (2026)

6/4/2026

Retention sum is a common risk allocation mechanism in construction contracts in Malaysia, intended to ensure proper completion of works and rectification of defects. It is typically deducted progressively from interim payments during construction, commonly at 5%–10%, subject to a contractual cap. Upon practical completion, it is common practice for half of the retention sum to be released. The balance is retained during the defects liability period and released after all defects are rectified and the final account is certified.While widely adopted across projects, retention sum often gives rise to confusion and disputes due to its impact on cash flow and differing contractual interpretations between employers and contractors.

Key Takeaways:

Retention sum is a contractual mechanism to secure performance and defect rectification, not a statutory requirement in Malaysia.
In Malaysia, retention terms are governed by standard form contracts and general contract law, supported by CIPAA 2012 for payment dispute resolution.
In Japan, subcontractor payments are tightly regulated under statutory deadlines, limiting the ability to withhold payments for extended periods.
Retention sum forms part of the taxable value under Malaysia’s SST regime once work is certified, regardless of actual payment.
Poor management of retention sums can lead to cash flow stress, tax exposure, and disputes over defect liability.

Retention Sum in Japan

Japan adopts a more regulated approach to subcontractor payments under the Construction Business Act (CBA), particularly in relation to payment timing and withholding practices.

Subcontractor Payments (Statutory Control)

No express ban on retention: The CBA does not state that retention sums are forbidden. However, any withholding must not delay payment beyond legally mandated deadlines.
Strict payment deadlines: Under CBA Articles 24-3 and 24-6, a main contractor must pay a subcontractor within: (i) One month after receiving payment from the project owner (for completed or progressed work); or (ii) 50 days from the subcontractor’s handover request (for other than a specified construction business operator or a corporation with paid-up capital of ¥40 million or more), whichever is earlier.
Prohibited practices: Withholding retention for a long period after work completion, inspection, and handover.
Best practice: Subcontract payments, including any retained portion, should be made as early as possible after work completion and handover, regardless of contractor size or capital.

Retention Between Owner and Main Contractor (Contractual Freedom)

Unlike the strict rules protecting subcontractors, Japan’s Construction Business Act does not regulate retention sums between a developer/owner and a main contractor. Retention in such main contracts is purely a matter of freedom of contract under the Japanese Civil Code. No statutory deadlines apply, and retention amounts and release terms are determined solely by the negotiated contract.

Contractual Framework in Malaysia

In Malaysia, retention sum is not governed by a single statute but is embedded in construction contracts and supported by general principles of contract law.

Standard forms such as CIDB, JKR, and PAM contracts typically define:

Retention percentage
Certification and release stages
Conditions for withholding or set-off

CIPAA 2012 further strengthens payment protection by providing a statutory adjudication mechanism for disputes relating to certified payment, including wrongful withholding of retention sums. While CIPAA does not eliminate retention practices, it ensures that disputes can be resolved in a timely and enforceable manner.

Contractors may pursue adjudication under CIPAA 2012, or alternatively arbitration or litigation depending on the dispute resolution clause in the contract.

Practical Observation from Project Experience (Japan-related Contracts)

Based on our project experience involving Japanese clients, the application of retention sum in practice can vary depending on the contract form adopted and the contracting structure.

Contract Form Depends on Client Requirements

Depending on the Japanese client, the contract adopted may follow either Malaysian-standard forms or Japanese-standard forms, depending on project structure and procurement approach.

Common Contract Templates Used

Malaysian format: Typically based on PAM standard form contracts.
Japanese format: Commonly based on either (i) Nikkenren Design-Build Contract Clauses published by the Japan Federation of Construction Contractors (日建連設計施工契約約款) or (ii) Standard Form of Private (Seven-Association) Construction Works Contract Conditions (民間(七会)連合協定工事請負契約約款) published by the Japan Federation Of Construcion Contaractors.

Retention Not Common in Main Contracting Arrangement

Regardless of the contract form used, retention sum is generally not applied when we act as the main contractor for factory or plant owners.
In many cases, no retention is withheld under such direct contracting arrangements.

Retention Common in Subcontracting Structure

Retention sum is more commonly applied when we are engaged as a subcontractor under a Japanese engineering company, where retention is usually withheld in accordance with their internal payment practices.

Early Release via Retention Guarantee

In situations where retention is withheld by a Japanese engineering company, it is often possible to negotiate early release of the final retention sum by providing a “Retention Money Guarantee” issued by a bank to the engineering company.

Common Issues and Disputes

Despite its administrative purpose, retention sum is one of the most common sources of dispute in construction projects.

Delayed Release: Retention is often released later than contractually required, creating cash flow pressure, particularly for smaller contractors.
Disputed Defects: Employers may withhold retention due to alleged defects, even where the severity or contractual basis is disputed.
Insolvency Risk: If an employer becomes insolvent, contractors may face difficulty recovering retention sums unless protections are contractually secured.
Lack of Transparency: Unclear calculations, deductions, or release mechanisms often lead to mistrust and disputes between parties.

Retention Sum and SST (Service Tax)

Retention sum has important implications under Malaysia’s Service Tax (SST) regime, particularly in determining when service tax becomes due and payable.

Key SST Treatment:

Included in taxable value: Retention forms part of the taxable consideration once construction services are certified.
Timing basis for normal payments vs retention: Normal progress payments are generally accounted for based on actual payment/receipt, whereas retention sums are subject to a separate timing rule as set out below.
12-month rule (retention-specific): Where any certified retention sum remains unpaid after 12 months from the date construction services are deemed rendered (as determined below), service tax becomes due and payable on the day after the expiry of the 12-month period, even if the customer has not yet paid it to the contractor.
Determination of when retention becomes due: For the purpose of retention sum, construction work services are deemed to have been rendered on the date the interim certificate is issued (if the project requires an interim certificate), or on the date the work is certified complete by the relevant party (if no interim certificate is issued).
Compliance requirement: Contractors must monitor outstanding retention to ensure timely and accurate SST reporting.

Practical Implication:Even though retention is not received in cash, it is still treated as taxable consideration once work is certified, creating a potential cash flow mismatch if not properly managed.

Conclusion

Retention sum remains an important contractual safeguard in construction projects, balancing performance security with post-completion accountability. However, its practical application requires careful contractual drafting, disciplined administration, and awareness of legal and tax implications.

Proper management of retention mechanisms can significantly reduce disputes, improve cash flow predictability, and enhance project delivery outcomes.

For points that Japanese companies should consider when hiring a construction partner (contractor) in Malaysia, please also refer to the related article, 'Engaging Contractors in Malaysia' for additional details.