What is a Suspicious Transaction Report (STR) under the Swedish Anti-Money Laundering Act?

A Suspicious Transaction Report (STR) is a report submitted to the Swedish Financial Intelligence Unit (Finanspolisen) when there are reasonable grounds to suspect that a specific transaction is linked to money laundering or terrorist financing.

When should an STR be submitted to the Swedish Financial Intelligence Unit?

An STR should be filed promptly once suspicion arises and the report must be made without delay. The customer must not be informed, as a prohibition on tipping-off applies.

What distinguishes an STR from a SAR?

An STR covers one or more concrete transactions, while a SAR typically concerns suspicious activities or behavioural patterns that are not tied to a specific transaction. Both are reported to the Swedish Financial Intelligence Unit in line with the Swedish Anti-Money Laundering Act.

Suspicious Transaction Report (STR)

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Glossary
Suspicious Transaction Report (STR)

Explained – what does suspicious transaction report (STR) mean?

A suspicious transaction report (STR), in Swedish “rapport om misstänkt transaktion”, is a formal report submitted by obliged entities to the Swedish Financial Intelligence Unit (Finanspolisen) when a specific transaction raises suspicion of money laundering or terrorist financing. Reporting is a legal obligation under the Swedish Anti-Money Laundering Act (2017:630) (penningtvättslagen). An AML lawyer often plays a central role in interpreting the framework and ensuring that the organisation’s processes meet the legal requirements as part of effective AML compliance work.

STR is the reporting type to use where a transaction is part of the report, as opposed to a Suspicious Activity Report (SAR), which does not cover specific transactions. While a SAR can encompass a wide range of suspicious activities, an STR must be used where a transaction forms part of the reporting. The term is used in the banking and financial sector in particular, but other obliged businesses are also covered.

When does the suspicious transaction report (STR) question arise?

An STR becomes relevant where a customer’s transaction lacks a clear business or legitimate purpose, or is inconsistent with the customer’s known financial profile. Examples include a sudden transfer to a high-risk country, use of multiple accounts to avoid detection, or unexpected payments between related companies without explanatory documentation.

The situation may also arise where the customer refuses to provide information about the origin of funds or source of funds, or where documentation shows signs of forged documentation. Under the Swedish Anti-Money Laundering Act, reporting must take place promptly and without the customer being informed.

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Points to consider for a suspicious transaction report (STR)

To identify suspicious transactions and meet the reporting obligation, obliged entities should work in a structured and forward-looking way. The following points are especially important for a functioning STR process and overall AML compliance.

Implement clear procedures for transaction monitoring to detect anomalies.
Ensure AML training for employees on risk indicators and assessment of suspicious behaviours is carried out on an ongoing basis.
Always document the decision-making process and the factors leading to the report – a clear STR definition and rationale matters.
Maintain continuous internal communication between relevant functions for swift handling of suspicions.
Use technical solutions that enable automatic flagging of high-risk transactions and support the suspicious transaction reporting process.
Carry out sanction list screening and checks against PEP registers.
Appoint responsible persons to quality-assure and approve each report before it is sent to the Swedish Financial Intelligence Unit (Finanspolisen).

A well-functioning STR process strengthens compliance and enhances credibility with supervisory authorities and customers.

Suspicious Transaction Report (STR)

Why is a report of a suspicious transaction (STR) important?

The suspicious transaction report helps detect and prevent illicit funds from being integrated into the financial system. By acting swiftly when suspicious transactions are identified, authorities can trace, halt and investigate criminal activity, including financial crime and broader economic crime. It is a central element of preventive work against money laundering.

For companies, a functioning process for reporting suspicious transactions is a prerequisite for meeting the requirements of the Swedish Anti-Money Laundering Act. It demonstrates active AML compliance and clear internal governance of risks linked to money laundering and terrorist financing.

Consistent and professional handling of suspicious transaction report STR obligations strengthens trust in both the business itself and the wider sector. It contributes to transparency, stability and a more resilient system against economic crime.

An suspicious transaction report is a report submitted to the Swedish Financial Intelligence Unit when the report contains details of a specific transaction.

An STR should be submitted as soon as there are reasonable grounds to suspect that a transaction forms part of money laundering or terrorist financing. Reporting must take place without delay and the customer must not be informed.

The difference lies in the focus. An STR covers one or more concrete transactions, whereas a SAR covers other types of suspicious activities.
In practice, this means that:

STR is used when an individual transaction raises suspicion.
SAR is used for broader behavioural patterns or activities.
Both are reported to the Swedish Financial Intelligence Unit in line with the Swedish Anti-Money Laundering Act.

An AML lawyer helps interpret legal requirements, establish internal procedures and provide legal support for assessments as part of ongoing AML compliance work.

They can also contribute by:

Providing AML training for employees on legal requirements and risk management.
Reviewing existing processes and identifying areas for improvement.
Advising on complex cases where suspicion is not clear-cut, including interaction with law enforcement authorities.

The report should describe the transaction, the parties involved, the reason for suspicion, and the available documentation. It is vital that the information is as complete and accurate as possible so that authorities can act effectively.

Once the Swedish Financial Intelligence Unit has received the report, it carries out an analysis. If there are grounds for further investigation, the case may be referred to law enforcement authorities. The company must not inform the customer; a prohibition on tipping-off applies.