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Know your customer (KYC) is the process a financial institution or other covered business uses to identify and verify a customer and understand the risks of serving them. The term often refers to identity checks during onboarding; it is also sometimes used for the broader customer due diligence (CDD) process, which can include ownership checks and ongoing monitoring.
What does KYC stand for?
KYC stands for “Know Your Customer.” It describes procedures for establishing who a customer is and assessing the risks associated with a business relationship. Although the phrase is common in financial services, obligations can also apply to other businesses covered by anti-money-laundering rules.
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Terminology is not completely uniform. HM Revenue & Customs (HMRC) describes CDD as sometimes referred to as KYC and as the collective term for checks on customers and, where applicable, beneficial owners. In everyday usage, KYC often means identity verification at onboarding, while CDD more clearly signals the wider set of checks and continuing duties. HMRC’s CDD guidance and its economic crime handbook show this broader usage.
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The exact checks depend on the customer, relationship, product, transaction, applicable rules, and assessed risk. A process may include:
- Identity checks: identifying a customer and verifying their identity using documents, data, or other reliable evidence.
- Beneficial-owner checks: identifying people who ultimately own or control a company or other legal arrangement, and taking reasonable steps to verify them.
- Purpose of the relationship: understanding why the customer wants the account or service and how it is expected to be used. Depending on the circumstances, this can involve information about source of funds or wealth.
- Authority checks: verifying the identity and authority of a person acting on a customer’s behalf, where required.
- Ongoing monitoring and updates: reviewing activity during a continuing relationship, checking whether transactions fit what the business knows about the customer, and updating records when circumstances change.
These are possible components, not a universal checklist. A business does not necessarily perform every check on every customer. Accepted documents, verification methods, timing, and legal thresholds vary by jurisdiction and sector; there is no single document list that applies everywhere.
How is KYC different from CDD and AML?
CDD means customer due diligence: the checks and related steps used to understand a customer and the risks of a relationship. KYC is often used to mean the identity-verification part of CDD, though some organizations use KYC as a broad label for the whole process.
AML means anti-money laundering. It refers to the wider measures intended to prevent and detect money laundering. CDD and KYC are among the controls that may support an AML program; they are not synonyms for every AML obligation. Rules may also address terrorist financing, often abbreviated TF, alongside money laundering.
Why do businesses carry out KYC?
KYC and CDD help a business understand who it serves, assess money-laundering and terrorist-financing risks, and identify activity that may need closer scrutiny. For banks, transaction monitoring is an important part of due diligence, according to the Bank for International Settlements’ AML and CFT overview. Keeping appropriate information can also support compliance and investigations.
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Why do KYC checks differ from one customer to another?
Due diligence is generally risk-based: the measures should match the risks presented by the customer and relationship. Some frameworks permit simplified checks in certain lower-risk cases and call for enhanced due diligence in specified higher-risk situations. HMRC’s UK guidance gives politically exposed persons and certain transactions connected to countries on the Financial Action Task Force’s Call for Action list as examples requiring enhanced treatment under that guidance.
As HMRC’s handbook puts it, “the higher the risk, the more verification of identity and scrutiny of transactions is required.” That does not mean every provider uses identical procedures: national rules and the particular circumstances shape what is appropriate.
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Proportionality also matters for access. The Financial Action Task Force (FATF) cautions that overly cautious AML/CFT safeguards can unintentionally exclude legitimate consumers and businesses from regulated services. Its 2025 guidance on financial inclusion presents a risk-based approach as a way to balance access with crime prevention.
When are KYC checks required, and what documents will you need?
There is no worldwide answer to when a check must be completed or what evidence will be accepted. FATF standards inform national frameworks, but local laws, regulator rules, business sector, and customer risk determine the actual requirements. A provider may ask an individual for identity evidence or a business for corporate and ownership information, but the required items depend on the case.
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For example, HMRC says that under the UK rules it describes, identity verification generally must be completed before a business relationship is established or a transaction is carried out when CDD is required. Its guidance allows a narrow exception for certain low-risk relationships, with verification completed as soon as practicable. This is a UK-specific example, not a global deadline; check the relevant provider’s instructions and rules for your jurisdiction.
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