The Suspicious Transaction Reporting Office (STRO): Singapore’s AML Reporting Hub
In a Nutshell
STRO is Singapore’s financial intelligence unit, within the Commercial Affairs Department of the Singapore Police Force.
It receives, analyses and disseminates financial intelligence. It takes in suspicious transaction reports, cash transaction reports and cash movement reports, and turns them into leads for law enforcement.
STRO is not a supervisor. It does not licence, inspect or discipline businesses. Every AML supervisor in Singapore feeds STRO, but STRO sits outside the count of sector supervisors.
Reporting runs through SONAR. The STRO Online Notices and Reporting platform is the single electronic channel for filing the prescribed reports.
Timeline for STR Filing. A suspicious transaction report must be submitted as soon as reasonably practicable after suspicion arises.
STRO: Singapore's AML reporting hub
Every anti-money laundering regime needs a place where suspicion is collected, analysed and turned into action. In Singapore, that place is the Suspicious Transaction Reporting Office. Whether the report comes from a bank, a pawnbroker, a law practice or a casino, it lands with STRO, which sits at the centre of the system as the national financial intelligence unit. This guide explains what STRO is, what it receives, how the SONAR platform works, how intelligence flows onward to investigators, and, importantly, why STRO is a reporting and intelligence body rather than a supervisor.
For the full set of supervisors, see the guide to AML supervisory authorities. For the underlying statutes, see the AML laws and regulations in Singapore pillar. This page explains the hub that all of those supervisors’ regulated businesses report to.
What STRO is and where it sits?
STRO is Singapore’s financial intelligence unit. It is a specialised office within the Commercial Affairs Department of the Singapore Police Force that receives, analyses and disseminates suspicious transaction reports and other financial information, including cash movement and cash transaction reports. It analyses this information to detect money laundering, which places it close to the investigators who act on what it produces.
Its function is intelligence, not supervision: it does not license firms, run compliance inspections or impose regulatory penalties. Those are the jobs of the sector supervisors, who require firms to have reporting controls; STRO is the recipient and analyst of what those controls produce.
As a financial intelligence unit, STRO also connects Singapore to the global network. Financial intelligence units cooperate internationally, including through the Egmont Group of financial intelligence units, so that intelligence can cross borders as quickly as the money does. That international reach matters in a hub like Singapore, where illicit flows are often cross-border.
What STRO receives?
STRO takes in several kinds of reports, and it is worth separating them because they are triggered differently. The table sets out the main ones.
Report | What triggers it | Who files |
Suspicious transaction report (STR) | A suspicion of money laundering, terrorism financing or other criminal conduct, at any value | Every person and business, across all sectors |
Cash transaction report (CTR) | A cash transaction at or above a sector threshold, for example S$10,000 for casinos and S$20,000 for regulated dealers | Sectors with a cash report duty, such as casinos and precious stones and metals dealers |
Cash movement report (CMR) | Physical movement of cash or bearer instruments into or out of Singapore above the declaration threshold | Travellers and businesses moving physical currency across the border |
The key distinction is between the suspicious transaction report, which is driven by suspicion and applies to everyone, and the cash transaction report, which is an automatic filing above a value threshold and applies only to sectors with that duty. A firm can owe both: a casino, for instance, files cash transaction reports for large cash play and separately files a suspicious transaction report whenever something looks wrong. STRO is the common destination for all of them.
SONAR: how reports are filed?
Reports are filed through SONAR, the STRO Online Notices and Reporting platform, which is the consolidated electronic channel for submitting suspicious transaction reports, cash transaction reports and cash movement reports. A business registers for SONAR and manages user access through defined roles, typically a submitter who prepares a report, a reviewer who checks it, and an administrator who manages the organisation’s account. Access is controlled, and the platform provides the current report forms and validation.
Electronic filing through a single platform matters for both sides. For the filer, it standardises the report and reduces the chance of an incomplete submission. For STRO, it means intelligence arrives in a structured, analysable form rather than as free text, which speeds analysis and dissemination. A firm’s practical task is to set up its SONAR access before it needs it, so that when a suspicion arises, the report can be filed promptly rather than after a scramble to register.
STR timing?
The law does not set a fixed number of days for a suspicious transaction report filing. The standard is that it must be filed as soon as reasonably practicable after the suspicion arises.
It is a substance test, not a calendar one: it means promptly, once the firm has formed the suspicion, without undue delay while the trail goes cold. Firms should not confuse their own internal escalation deadlines, which a good programme sets so that front-line staff raise concerns quickly, with the statutory filing standard. The internal deadline exists to make sure the suspicion reaches the person who files; the statutory standard governs when that person must file with STRO.
Timing is scrutinised because a late report can be as damaging as no report. Intelligence value decays: by the time a delayed report arrives, the funds may have moved, and the opportunity to trace or freeze them may be gone. Both STRO and the sector supervisors take report timeline seriously, and a pattern of late filing is the kind of control weakness an inspection will flag.
How financial intelligence moves?
STRO is one link in a chain, and seeing the whole chain explains why the report matters. A regulated business detects something suspicious and files through SONAR. STRO receives and analyses the report, combines it with other intelligence, and disseminates leads to the competent authorities, principally law enforcement, which investigate and, where appropriate, pursue prosecution and asset recovery. The figure below places STRO in the national chain.
In the language of Singapore’s national strategy, STRO is the heart of the Detect pillar. The Prevent pillar is the supervisory and gatekeeper work that stops illicit funds from entering; Detect is the financial intelligence STRO produces; and Enforce is the investigation, prosecution and recovery that follows.
The chain also runs in reverse: STRO and the enforcement agencies feed back typologies, case learning and, where useful, guidance, which sharpens the next generation of controls and reports. A firm that reads that feedback files better reports, and better reports make the whole system work.
STRO and the supervisors
It is worth being precise about the division of labour, because firms often blur it. Sector supervisors, such as MAS, ACRA, the Council for Estate Agencies, the Gambling Regulatory Authority, and Ministry of Law bodies, supervise whether a firm has effective reporting controls: whether it can detect suspicion, escalate it, and file a proper report.
STRO receives and analyses the reports those controls produce. So, when an inspection asks about suspicious transaction reporting, it is the supervisor testing the firm’s controls, not STRO. STRO does not inspect the firm; it uses the output. The same report therefore has two audiences: the supervisor cares that it was made well and on time, and STRO cares about the intelligence it contains.
Reporting quality and feedback
STRO and the supervisors publish material to help firms report well, including guidance on the SONAR forms, red-flag indicators, and typology and case information. A good report is specific: it sets out what was observed, why it is suspicious, who and what is involved, and the supporting facts the firm gathered, rather than a bare statement that something felt wrong. The supervisors’ guidance is explicit that a report should be supported by evidence the firm collected, not merely the surface facts of a transaction. Firms that treat STRO guidance and feedback as training material, rather than filing on autopilot, produce more useful reports that are less likely to be criticised in an inspection.
Offences: failure to report and tipping off
Two criminal exposures sit around reporting, and they are distinct from any supervisory penalty. The first is failure to report: where a person knows or has reasonable grounds to suspect money laundering or terrorism financing in the course of their trade or profession and does not file a report, that is an offence under the reporting provisions, principally section 45 of the Corruption, Drug Trafficking and Other Serious Crimes Act for money laundering, with a parallel duty for terrorism financing.
The second is tipping off: disclosing to the customer or another person that a report has been or may be made, or otherwise prejudicing an investigation, is itself an offence. These are criminal matters, separate from the regulatory consequences a supervisor can impose for weak controls, and their maximum penalties are set by the legislation and should be cited from the statutes at publication.
Conclusion
STRO is the point where Singapore’s suspicious transaction reporting framework converges. Regulated businesses report suspicious transactions to STRO, while sector supervisors oversee whether those businesses have effective systems for identifying, escalating and reporting suspicious activity. STRO analyses the information it receives, develops financial intelligence and disseminates relevant intelligence to agencies that can take further action. Understanding STRO therefore clears up two common misconceptions: filing a report does not end a firm’s AML, CFT and CPF obligations, and STRO is not the regulator of reporting entities.
STRO is Singapore’s financial intelligence unit, dependent on accurate and timely reporting through SONAR, while the relevant supervisors hold regulated businesses accountable for maintaining effective reporting controls. For a regulated business, the practical lesson is simple: establish the SONAR reporting process early, maintain a clear internal escalation framework, submit reports as soon as reasonably practicable, never tip off the customer, and use STRO’s guidance and feedback to strengthen reporting quality.
If you need help building the reporting process or improving report quality, our regulatory reporting support is designed for this, while our AML policy documentation service covers the escalation and reporting framework behind it.
Frequently Asked Questions
No. STRO is Singapore’s financial intelligence unit, within the Commercial Affairs Department of the Singapore Police Force. It receives, analyses and disseminates financial intelligence, but it does not license, inspect or discipline businesses, which is the role of the sector supervisors.
It is the Suspicious Transaction Reporting Office, or STRO. As the national financial intelligence unit, it is the central agency for receiving and analysing suspicious transaction reports and related financial information and disseminating intelligence to law enforcement.
Suspicious transaction reports, cash transaction reports and cash movement reports. Suspicious transaction reports apply to everyone on suspicion; cash transaction reports apply to sectors with a cash reporting duty such as casinos and regulated dealers; cash movement reports cover physical cross-border movement of currency.
SONAR is the STRO Online Notices and Reporting platform, the consolidated electronic channel for filing suspicious transaction reports, cash transaction reports and cash movement reports. Businesses register and manage user access through submitter, reviewer and administrator roles.
Any person who, in the course of their trade, profession or business, knows or has reasonable grounds to suspect money laundering or terrorism financing must file under section 39 of the Corruption, Drug Trafficking and Other Serious Crimes Act and the terrorism financing legislation.
As soon as reasonably practicable after the suspicion arises. There is no fixed number of days; the standard is prompt filing once suspicion is formed, and internal escalation deadlines should not be confused with this statutory standard.
A suspicious transaction report is triggered by suspicion at any value. A cash transaction report is an automatic filing above a cash threshold in sectors with that duty. A cash movement report covers physically moving cash or bearer instruments across the border above the declaration threshold.
Yes. Supervisors inspect whether a firm can detect, escalate and file suspicious transaction reports properly and on time. STRO receives and analyses the reports, but it is the supervisor that tests the firm’s reporting controls.
STRO analyses it, combines it with other intelligence, and disseminates leads to law enforcement and other competent authorities, which investigate and may pursue prosecution and asset recovery. It also feeds back typologies and learning that improve future reporting.
About the Author
Pathik Shah
FCA, CAMS, CISA, CS, DISA (ICAI), FAFP (ICAI)
Pathik is a Chartered Accountant with more than 26 years of experience in governance, risk, and compliance. He helps companies with end-to-end AML compliance services, from conducting Enterprise- Wide Risk Assessments to implementing the robust AML Compliance framework. He has played a pivotal role as a functional expert in developing and implementing RegTech solutions for streamlined compliance.
