Insolvency, Debt Recovery & PMLA

Suspicious Transaction Reports (STR): What Banks and NBFCs Must Report to FIU-IND

CA Nikhil Gupta·July 2026· PMLA Rules — Reporting to FIU-IND PMLA / AML

Reviewed by CA Nikhil Gupta · Last reviewed 17 July 2026

Every bank account in India sits under a quiet, continuous monitoring obligation most customers never see — and the specific trigger for a report isn't the transaction amount, but whether it has a plausible economic explanation.

What FIU-IND is

The Financial Intelligence Unit – India (FIU-IND) is the central national agency responsible for receiving, processing, analysing, and disseminating information relating to suspicious financial transactions — it sits at the centre of India's anti-money-laundering reporting architecture, receiving reports from banks, financial institutions, and other reporting entities across the country.

The reports reporting entities must file

Suspicious Transaction Report (STR) — the core discretionary report, based on a reporting entity's own assessment that a transaction is suspicious (detailed below).
Cash Transaction Report (CTR) — for cash transactions above a specified threshold (commonly cited around ₹10 lakh, or a series of integrally connected cash transactions aggregating to that level within a month).
Non-Profit Organisation Transaction Report (NTR) — covering specified transactions involving non-profit organisations, given the historical concern about NPOs being used as a channel for illicit fund movement or terrorist financing.
Cross-Border Wire Transfer Report (CBWTR) — for cross-border wire transfers above a specified threshold.

What actually makes a transaction "suspicious"

Unlike the CTR (which is triggered by a simple, objective rupee threshold), an STR is a judgment-based determination by the reporting entity. A transaction is generally treated as suspicious where it:

Gives rise to a reasonable ground of suspicion that it may involve proceeds of crime, regardless of the amount involved — a small transaction can trigger an STR just as readily as a large one, if the pattern is suspicious.
Appears to have no economic rationale or bona fide purpose.
Appears designed to give a legitimate purpose facade to what is actually an illegal purpose.

⚠ Amount is not the trigger — pattern and rationale are: A common misconception is that STR obligations are only about large transactions. In reality, a modest-value transaction with an implausible business rationale, or one that is structured to just stay under a reporting threshold (a pattern regulators specifically watch for, known as "structuring" or "smurfing"), can trigger an STR far more readily than a large but well-documented, economically sensible transaction.

The confidentiality requirement — "tipping off" is prohibited

Reporting entities are prohibited from informing the customer or any third party that an STR has been (or is about to be) filed concerning their account or transaction — this "no tipping off" rule exists specifically to prevent a suspected launderer from being alerted and moving funds or destroying evidence before authorities can act. Bank staff handling STR filings operate under strict internal confidentiality protocols precisely because of this legal prohibition.

Reporting timeline

Reporting entities are required to file STRs with FIU-IND within a specified period of forming the suspicion (commonly referenced as within 7 days of the internal determination that a transaction is suspicious, following the entity's own internal escalation and review process) — the exact prescribed timeline should be confirmed against the current PMLA Rules.

What happens after an STR is filed

FIU-IND analyses the report (often alongside other reports and intelligence it holds) and, where warranted, disseminates relevant information to law enforcement and investigative agencies, including the Enforcement Directorate, for further action — filing an STR is the start of an intelligence and investigative process, not itself an accusation or legal action against the customer.

Frequently Asked Questions

Will a bank tell me if they’ve filed an STR involving my account? ▼

No — reporting entities are legally prohibited from disclosing to the customer (or any other party) that an STR has been filed or is being considered, under the "tipping off" prohibition. Discovering an STR was filed typically only happens later, if it leads to a formal investigation or inquiry by an agency like the ED.

Does filing an STR mean the bank believes I’ve committed a crime? ▼

No — an STR reflects the reporting entity’s judgment that a transaction meets the suspicion criteria under the regulatory framework (unusual pattern, lack of clear economic rationale, etc.), which is a much lower bar than an actual determination of wrongdoing. Many STRs are filed on transactions that, after investigation, turn out to have entirely legitimate explanations.

Can a business avoid STR scrutiny by keeping all transactions below the CTR cash threshold? ▼

No — this is exactly the "structuring" pattern regulators specifically watch for, and can itself become the basis for an STR, since deliberately splitting transactions to stay under a reporting threshold is itself treated as a suspicious pattern, not a way to avoid reporting obligations.

Source and review trail

Use the current official instrument, portal or regulator publication before acting.

Primary category: Insolvency, Debt Recovery & PMLA
Official starting point: ibbi.gov.in