Suspicious Activity Report Meaning: SARs in UK AML

Certivus AML team8 minUpdated 2026-06-27

In brief: A Suspicious Activity Report is a report made where relevant knowledge, suspicion, or belief about money laundering or terrorist financing arises.

Key points

  • SARs are about suspicion or knowledge, not proof beyond doubt.
  • In a firm, staff usually raise an internal report before any external SAR decision.
  • The decision record should explain the facts, analysis, outcome, and follow-up.

What is a Suspicious Activity Report?

A Suspicious Activity Report, or SAR, is a report used to alert the UK Financial Intelligence Unit to possible money laundering or terrorist financing. The NCA SAR guidance describes SARs as a vital source of intelligence.

SAR meaning in a firm

For a regulated accountancy or law firm, SAR work normally starts internally. A staff member spots a concern and reports it to the MLRO or nominated officer. The MLRO reviews the facts and decides what to do next.

What should be in the record?

  • Client or matter name.
  • Facts that caused concern.
  • Documents reviewed.
  • Client explanation.
  • Why suspicion may or may not exist.
  • MLRO decision.
  • Date, reviewer, and follow-up.

What not to do

Do not tell the client that a SAR is being considered or has been made. Do not keep vague notes such as "looks suspicious" without facts. Do not make a decision verbally and leave no record.

This guide is general information and is not legal advice.