KYC Requirements in Singapore: MAS CDD Rules for Banks and Payment Companies
Singapore's KYC framework is more specific — and more enforced — than most compliance teams from outside the region expect. The Monetary Authority of Singapore does not publish voluntary guidelines on customer due diligence. It issues Notices: binding legal instruments with criminal penalties for non-compliance. For banks, MAS Notice 626 sets the requirements. For payment service providers licensed under the Payment Services Act, MAS Notice PSN01 and PSN02 apply.
This guide covers what MAS requires for customer identification and verification, the three tiers of CDD Singapore institutions must apply, beneficial ownership obligations, enhanced due diligence triggers, and the recurring gaps MAS examiners find in KYC programmes.

The Regulatory Foundation: MAS Notice 626 and PSN01/PSN02
MAS Notice 626 applies to banks and merchant banks. It sets out prescriptive requirements for:
- Customer due diligence (CDD) — when to perform it, what it must cover, and how to document it
- Enhanced due diligence (EDD) — specific triggers and minimum requirements
- Simplified due diligence (SDD) — the limited circumstances where reduced CDD applies
- Ongoing monitoring of business relationships
- Record keeping
- Suspicious transaction reporting
MAS Notice PSN01 (for standard payment licensees) and MAS Notice PSN02 (for major payment institutions) under the Payment Services Act 2019 set equivalent obligations for payment companies, e-wallets, and remittance operators. The CDD framework in PSN01/PSN02 mirrors the structure of Notice 626 but calibrated to payment service business models — including specific requirements for transaction monitoring on payment flows, cross-border transfers, and digital token services.
Both Notices are regularly updated. Institutions should refer to the current MAS website versions rather than archived copies — amendments following Singapore's 2024 National Risk Assessment update guidance on beneficial ownership verification and higher-risk customer categories.
When CDD Must Be Performed
MAS Notice 626 specifies four triggers requiring CDD to be completed before proceeding:
- Establishing a business relationship — KYC must be completed before onboarding any customer into an ongoing relationship
- Occasional transactions of SGD 5,000 or more — one-off transactions at or above this threshold require CDD even without an ongoing relationship
- Wire transfers of any amount — all wire transfers require CDD, with no minimum threshold
- Suspicion of money laundering or terrorism financing — CDD is required regardless of transaction value or customer type when suspicion arises
The inability to complete CDD to the required standard is grounds for declining to onboard a customer or for terminating an existing business relationship. MAS examiners check that institutions apply this requirement in practice, not just in policy.
Three Tiers of CDD in Singapore
Singapore's CDD framework has three levels, applied based on the customer's assessed risk:
Simplified Due Diligence (SDD)
SDD may be applied — with documented justification — for a limited category of lower-risk customers:
- Singapore government entities and statutory boards
- Companies listed on the Singapore Exchange (SGX) or other approved exchanges
- Regulated financial institutions supervised by MAS or equivalent foreign supervisors
- Certain low-risk products (e.g., basic savings accounts with strict usage limits)
SDD does not mean no due diligence. It means reduced documentation requirements — but institutions must document why SDD applies and maintain that justification in the customer file. MAS does not permit SDD to be applied as a default for corporate customers without case-by-case assessment.
Standard CDD
Standard CDD is the baseline requirement for all other customers. It requires:
- Customer identification: Full legal name, identification document type and number, date of birth (individuals), place of incorporation (entities)
- Verification: Identity documents verified against reliable, independent sources — passports, NRIC, ACRA business registration, corporate documentation
- Beneficial owner identification: For legal entities, identify and verify the natural persons who ultimately own or control the entity (see below for the 25% threshold)
- Purpose and intended nature of the business relationship documented
- Ongoing monitoring of the relationship for consistency with the customer's profile
Enhanced Due Diligence (EDD)
EDD applies to higher-risk customers and situations. MAS Notice 626 specifies mandatory EDD triggers:
- Politically Exposed Persons (PEPs): Foreign PEPs require EDD as a minimum. Domestic PEPs are subject to risk-based assessment. PEP status extends to family members and close associates. Senior management approval is required before establishing or continuing a relationship with a PEP. EDD for PEPs must include source of wealth and source of funds verification — not just identification.
- Correspondent banking relationships: Respondent institution KYC, assessment of AML/CFT controls, and senior management approval before establishing the relationship
- High-risk jurisdictions: Customers or transaction counterparties connected to FATF grey-listed or black-listed countries require EDD and additional scrutiny
- Complex or unusual transactions: Transactions with no apparent economic or legal purpose, or that are inconsistent with the customer's known profile, require EDD investigation before proceeding
- Cross-border private banking: Non-face-to-face account opening for high-net-worth clients from outside Singapore requires additional verification steps
EDD is not satisfied by collecting more documents. MAS examiners look for evidence that the additional information gathered was actually used in the risk assessment — source of wealth narratives that are vague or unsubstantiated are treated as inadequate EDD, not as EDD completed.

Beneficial Owner Verification
Identifying and verifying beneficial owners is one of the most examined areas of Singapore's KYC framework. MAS Notice 626 requires institutions to identify the natural persons who ultimately own or control a legal entity customer.
The threshold is 25% shareholding or voting rights — any natural person who holds, directly or indirectly, 25% or more of a company's shares or voting rights must be identified and verified. Where no natural person holds 25% or more, the institution must identify the natural persons who exercise control through other means — typically senior management.
For layered corporate structures — where ownership runs through multiple holding companies across different jurisdictions — institutions must look through the structure to identify the ultimate beneficial owner. MAS examiners consistently flag beneficial ownership documentation failures as a top finding in corporate customer reviews. Accepting a company registration document without looking through the ownership chain does not satisfy this requirement.
Trusts and other non-corporate legal arrangements require identification of settlors, trustees, and beneficiaries with 25% or greater beneficial interest.
Digital Onboarding and MyInfo
Singapore's national digital identity infrastructure supports MAS-compliant digital onboarding. MyInfo, operated by the Government Technology Agency (GovTech), provides verified personal data — NRIC details, address, employment, and other government-held data — that institutions can retrieve with customer consent.
MAS has confirmed that MyInfo retrieval is acceptable for identity verification purposes, reducing the documentation burden for individual customers. Institutions using MyInfo for onboarding must document the verification method and maintain records of the MyInfo retrieval.
For corporate customers, ACRA's Bizfile registry provides business registration and officer information that can be used for entity verification. Beneficial ownership still requires independent verification — Bizfile shows registered shareholders but does not always reflect ultimate beneficial ownership through nominee structures.
Ongoing Monitoring and Periodic Review
KYC is not a one-time onboarding requirement. MAS Notice 626 requires ongoing monitoring of established business relationships to ensure that transactions remain consistent with the institution's knowledge of the customer.
This has two components:
Transaction monitoring — detecting transactions inconsistent with the customer's business profile, source of funds, or expected transaction patterns. For the transaction monitoring requirements that feed into this ongoing CDD obligation, see our MAS Notice 626 guide.
Periodic CDD review — customer records must be reviewed and updated at intervals appropriate to the customer's risk rating. High-risk customers require more frequent review. The review must check whether the customer's profile has changed, whether beneficial ownership has changed, and whether the risk rating remains appropriate.
The trigger for an out-of-cycle CDD review includes: material changes in transaction patterns, adverse media, connection to a person or entity of concern, and changes in beneficial ownership.
Record-Keeping Requirements
MAS Notice 626 requires institutions to retain CDD records for five years from the end of the business relationship, or five years from the date of the transaction for one-off customers. Records must be maintained in a form that allows reconstruction of individual transactions and can be produced promptly in response to an MAS request or court order.
The five-year clock runs from the end of the relationship — not from when the records were created. For long-term customers, this means maintaining KYC documentation, transaction records, SAR-related records, and correspondence for the full relationship period plus five years.
Suspicious Transaction Reporting
Singapore uses Suspicious Transaction Reports (STRs) filed with the Suspicious Transaction Reporting Office (STRO), administered by the Singapore Police Force. There is no minimum transaction threshold — any transaction, regardless of amount, that raises suspicion must be reported.
STRs must be filed as soon as practicable after suspicion is formed. The Act does not set a specific deadline in days, but MAS examiners and STRO guidance indicate that delays of more than a few business days without documented justification will attract scrutiny.
The tipping-off prohibition under the Corruption, Drug Trafficking and Other Serious Crimes (CDSA) Act makes it a criminal offence to disclose to a customer that an STR has been filed or is under consideration.
For cash transactions of SGD 20,000 or more, institutions must file a Cash Transaction Report (CTR) regardless of suspicion. CTRs are filed with STRO within 15 business days.
Common KYC Failures in MAS Examinations
MAS's examination findings and industry guidance consistently flag the same recurring gaps:
Beneficial ownership not traced to ultimate natural persons. Institutions stop at the first layer of corporate ownership without looking through nominee shareholders or holding company structures to identify the actual controlling individuals.
EDD documentation without substantive assessment. Files contain EDD documents — source of wealth declarations, bank statements, company accounts — but no evidence that the documents were reviewed, assessed, or used to update the risk rating.
PEP definitions applied too narrowly. Institutions identify foreign government ministers as PEPs but miss domestic senior officials, senior executives of state-owned enterprises, and immediate family members of identified PEPs.
Static customer profiles. CDD completed at onboarding is never updated. Customers whose transaction patterns have changed significantly since onboarding retain their original risk rating without periodic review.
MyInfo used as a complete KYC solution. MyInfo satisfies identity verification for individuals but does not substitute for source of funds verification, purpose of relationship documentation, or beneficial ownership checks on corporate structures.
STR delays. Suspicion forms during transaction review but is not escalated or filed for days or weeks. Case management systems without deadline tracking are the most common operational cause.
For Singapore institutions evaluating whether their current KYC and monitoring systems can meet these requirements, see our Transaction Monitoring Software Buyer's Guide for a full framework covering the capabilities MAS-regulated institutions need.
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