Suspicious transaction report (STR) is a mandatory report filed by financial institutions and other reporting entities with the Financial Intelligence Unit of India (FIU-IND) when a transaction gives rise to a reasonable ground of suspicion that it may involve proceeds of crime, be linked to terrorist financing, or lack any apparent economic rationale. Under Indian law, the obligation to file STRs is imposed by Section 12 of the Prevention of Money Laundering Act, 2002, read with Rule 7 of the PML (Maintenance of Records) Rules, 2005.
Legal definition
The PMLA, 2002 and subordinate rules establish the STR framework:
Rule 2(1)(g) of PML Rules, 2005: "'Suspicious transaction' means a transaction whether or not made in cash which, to a person acting in good faith — (a) gives rise to a reasonable ground of suspicion that it may involve the proceeds of crime; or (b) appears to be made in circumstances of unusual or unjustified complexity; or (c) appears to have no economic rationale or bonafide purpose; or (d) gives rise to a reasonable ground of suspicion that it may involve financing of the activities relating to terrorism."
Rule 7(2): "Every reporting entity shall furnish to the Director [FIU-IND] information relating to suspicious transactions referred to in sub-rule (1) within seven working days on being satisfied that the transaction is suspicious."
Section 12(1)(b) of PMLA: Requires every reporting entity to furnish to the FIU-IND information relating to transactions referred to in clause (b) of sub-section (1) of Section 12, in such form, at such intervals, and in such manner as may be prescribed.
Reporting entities include banks, insurance companies, NBFCs, stock brokers, mutual funds, payment system operators, cryptocurrency exchanges (since March 2023), and other entities specified under the PMLA Rules.
How courts have interpreted this term
Vijay Madanlal Choudhary v. Union of India [(2022) 10 SCC 1]
The Supreme Court upheld the PMLA's reporting framework, including the obligation of reporting entities to file suspicious transaction reports. The Court held that the statutory obligations imposed on banking companies and financial institutions under the PMLA are in the nature of preventive measures designed to create an intelligence-led enforcement system. The Court affirmed that the FIU-IND and the Enforcement Directorate have the authority to investigate and act on STR filings.
Union of India v. Hassan Ali Khan [(2011) 10 SCC 235]
The Supreme Court addressed the failure of banks to report suspicious transactions involving large, unexplained deposits and held that the banking system's compliance with PMLA reporting obligations is essential for the integrity of the financial system. The Court observed that the identification and reporting of suspicious transactions is a statutory duty, not a discretionary function, and that banks cannot plead ignorance or lack of resources as a defence for non-reporting.
Why this matters
Suspicious transaction reports are the foundation of India's financial intelligence system. FIU-IND, established in November 2004 as India's national financial intelligence unit, receives, processes, analyses, and disseminates STRs and other financial intelligence to law enforcement agencies including the Enforcement Directorate, CBI, Income Tax Department, and Narcotics Control Bureau.
For financial institutions, STR filing is a mandatory compliance obligation with significant consequences for failure. The RBI, SEBI, and IRDAI have issued detailed guidelines on the identification and reporting of suspicious transactions. The Principal Officer of each reporting entity is personally responsible for ensuring timely filing. Non-compliance attracts penalties under Section 13 of the PMLA (monetary penalty up to Rs 5 lakh for each failure), and wilful default can attract prosecution.
For compliance officers, the critical challenge is the "tipping off" prohibition — under Rule 7(7) of the PML Rules, no reporting entity or its employee shall disclose to the customer or any other person that an STR has been filed with FIU-IND. Violation of this confidentiality requirement can attract penalty and prosecution. Additionally, the PMLA provides safe harbour protection under Section 12AA — a reporting entity acting in good faith in filing an STR cannot be held liable for defamation or breach of confidentiality.
Related terms
Parent framework:
Related compliance mechanisms:
Frequently asked questions
What triggers the filing of a suspicious transaction report?
An STR must be filed when a transaction, whether or not in cash, gives rise to reasonable suspicion that it involves proceeds of crime, appears to have no economic rationale, involves unusual or unjustified complexity, or relates to terrorist financing. Common triggers include structuring of cash transactions to avoid reporting thresholds, sudden large deposits inconsistent with the customer's profile, round-tripping of funds, and transactions involving high-risk jurisdictions.
What is the time limit for filing an STR?
Under Rule 7(2) of the PML Rules, a suspicious transaction report must be filed with FIU-IND within 7 working days from the date the reporting entity is satisfied that the transaction is suspicious. The report must be filed electronically through the FINnet 2.0 portal maintained by FIU-IND.
Can a bank be penalised for not filing an STR?
Yes. Under Section 13 of the PMLA, the FIU Director can impose a monetary penalty of up to Rs 5 lakh for each failure to comply with reporting obligations. Additionally, the RBI can impose penalties on banks under the Banking Regulation Act for non-compliance with AML/CFT guidelines. In severe cases, the Principal Officer and other responsible officials can face prosecution under the PMLA.
This entry is part of the Veritect Indian Legal Glossary, a comprehensive reference of Indian legal terminology grounded in statutory text and judicial interpretation.
Last updated: 2026-03-27. Veritect provides this content for informational purposes and does not constitute legal advice.