Updated
GL-S-03
Glossary · Due Diligence and compliance
STR/SAR - a bank's report of a suspicious transaction
STR/SAR — a suspicious transaction report that a bank is required to file with the regulator when there are signs of laundering or other risks.
01 / In 30 seconds
The short answer
- What it is
- STR/SAR — a bank’s report of a suspicious transaction to the regulator
- When
- Where there are signs of money laundering or other financial risks
- Who files
- A bank or financial institution obliged by law
- For the client
- The filing is not usually disclosed
- How to avoid it
- Transparent and explainable transactions
02 / In plain words
What STR / SAR means
An STR/SAR (suspicious transaction report / suspicious activity report) is a report that a bank or financial institution is obliged to file with a special state body (the financial intelligence unit) if a transaction or a client’s behaviour raises suspicion of money laundering, terrorist financing or other breaches.
Filing such a report is not the bank’s decision to “punish” the client but its direct legal obligation: if it fails to file where there are clear signs, the bank itself is liable. The trigger may be an unusually large or atypical transaction, an unclear source of funds, splitting payments, or activity inconsistent with the client’s profile. An important detail: in many jurisdictions the bank is prohibited from telling the client that a report has been filed (the “tipping-off” rule).
For the client this means that their financial activity is constantly assessed for suspiciousness, and they may not even know that a report has been filed on a particular transaction. The only reliable protection is to conduct your affairs transparently: a clear source of funds, transactions consistent with your profile, readiness to explain any large transaction. We help clients structure their financial activity so that it gives no grounds for suspicion.
A case from practice
A client is about to carry out a large atypical transaction that could easily look suspicious to the bank. We prepare in advance documents explaining its nature and the source of funds, and agree the logic with the bank. The transaction fits a clear profile — and gives no grounds for a report to the regulator.
Where the risk of an STR/SAR arises
- Large and atypical transactions
- An unclear source of funds
- Splitting payments
- Activity inconsistent with the profile
- International transfers
- Ongoing account monitoring
03 / What it covers
What matters about STR/SARs
What it is
- A report of suspicion
- To the financial intelligence unit
- The bank’s obligation
Triggers
- Large transactions
- An unclear source
- Splitting payments
Distinctive feature
- The client is not told
- The tipping-off rule
- Constant assessment
Protection
- Transparent transactions
- A clear source
- Readiness to explain
04 / How it works
How to reduce the risk
A clear source of funds
Documents on the origin of the money are ready before the transaction.
Transactions in line with the profile
Amounts and counterparties match what you told the bank.
Documents for large transactions
A contract, invoice or statement for every large transaction.
Readiness to explain
We answer the bank's questions quickly and with documents.
No grounds for suspicion
The bank understands the transaction and has no questions.
05 / Key facts
What you need to know
01What it is
A report to the financial intelligence unit
A bank or other financial institution informs the state of a transaction showing signs of money laundering or other breaches.
02Why it is filed
A legal duty
It is not a penalty for the client. If the bank fails to report clear red flags, the bank itself is liable.
03Triggers
Unusual transactions
A large or unusual amount, an unclear source of funds, split payments, activity that does not match the client's profile.
04For the client
Usually not told
In many countries the bank is prohibited from telling the client a report was filed. The person may never know.
Common mistakes
Splitting a large sum into small payments
Make one payment openly, with the contract and proof of the source of funds.
Changing the pattern of transactions abruptly without explanation
Tell the bank in advance and show documents on the new activity.
Keeping the source of funds "in your head"
Gather statements, contracts and tax returns before a large transaction.
Assuming the bank can look the other way
Assume the bank must report any suspicion, and keep your affairs transparent.
06 / Expert advice
How to prepare in advance
To give no grounds for a suspicious transaction report, financial activity is conducted transparently: with a clear source of funds, transactions consistent with the declared profile and readiness to explain any large transaction with documents. Splitting payments and unexplained spikes are avoided. Then the bank has no grounds to see anything suspicious in the transactions.
What we do for you. We help structure financial activity so that it does not arouse suspicion: a clear source of funds, transactions in line with the profile, documents for large transactions. That way the bank has no grounds for a report to the regulator, and your affairs are conducted transparently and calmly, with no hidden risks to the account.
Klara RihterBanking compliance and source of funds specialist
07 / Questions
Frequently asked questions
A report of a suspicious transaction or activity that a bank is obliged to file with the financial intelligence unit where there are signs of money laundering or other breaches.
No, it is the bank’s legal obligation. If it fails to file where there are clear signs, the bank itself is liable. The decision is dictated by the rules, not by its attitude to the client.
An unusually large or atypical transaction, an unclear source of funds, splitting payments, or activity inconsistent with the client’s declared profile.
Usually not: in many jurisdictions the bank is prohibited from notifying the client that a report has been filed (the tipping-off rule). The client may not even know about it.
Conduct your affairs transparently: a clear source of funds, transactions in line with your profile, readiness to explain large transactions with documents. We help set this up.
Yes, splitting large sums into small ones is a classic sign of suspicious activity. It is more likely to attract attention than hide the transaction. It is better to carry it out transparently.
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