What’s KYC (Know Your Customer)?

Banks, payment services, and cryptocurrency exchanges may ask you to verify your identity. KYC, short for Know Your Customer, is the set of identity checks and reviews providers use to confirm who their customers are and assess the risks of serving them.

There is no single worldwide KYC checklist. The information a provider requests depends on its country, the service you want, and the risks it needs to assess.

What KYC checks include

Providers do more than look at an ID. They gather information about you, check that it is reliable, and learn enough about the account or service to understand how you expect to use it. They then compare relevant activity with those expectations.

For an individual, a U.S. bank might ask for your name, address, date of birth, and an identification number. It can check those details using documents or other methods. Those are U.S. examples, not requirements that apply to every provider or country.

A business customer may also need to identify the people who ultimately own or control the business. These people are called beneficial owners. This helps a financial institution understand who owns or controls a business account.

Why providers ask

Financial institutions use customer information to assess risks such as money laundering and terrorist financing. Knowing how a customer expects to use an account helps the institution compare transactions with that expected use and identify activity that differs from the customer’s profile.

KYC helps providers manage those risks. It does not guarantee that they will detect every crime, prevent every fraud, or know everything about a customer.

Why KYC checks continue

Providers may continue KYC checks after an account opens. In the United States, FinCEN’s customer due diligence rules require institutions covered by the rules to understand the nature and purpose of their relationships with customers. They must also watch for suspicious transactions and update customer information according to risk.

Customers do not necessarily repeat every check on a fixed schedule. A provider’s follow-up depends on the relationship and the risks it identifies. New information or activity that raises questions can prompt more checks.

Some U.S. requirements also change over time. As of May 2026, FinCEN guidance described an order that lets covered institutions limit when they identify and verify beneficial owners of legal-entity customers. The order applies in specified circumstances, and institutions can choose whether to use it. It changes only part of U.S. KYC rules.

Why KYC requirements vary

The Financial Action Task Force (FATF) sets international standards for preventing money laundering and terrorist financing. Countries put those standards into their own laws, so the rules vary from country to country. In the United States, for example, FinCEN’s customer due diligence rule applies to certain types of financial institutions, not every business that serves customers.

The provider and service matter, too. A bank account, investment service, and cryptocurrency exchange can involve different checks. A request for extra information may reflect the provider’s legal obligations or its assessment of a particular relationship.

If a request seems unclear, ask the provider what information it needs and why. Before sharing identity documents or other sensitive details, make sure you are using the provider’s official website or app.

When KYC creates barriers

Identity checks can make financial services harder to access for people who lack accepted documents or cannot easily provide them. FATF guidance recognizes that overly cautious checks can exclude legitimate customers and supports matching checks to the risks involved.

The FDIC’s 2023 survey shows that identification is one barrier to banking, though people reported other reasons more often. Among unbanked households, 5.1% named a lack of required personal identification as their main reason for not having an account. The figure was 9.3% for households that had never had a bank account. By comparison, 23.3% cited not having enough money to meet minimum-balance requirements, and 15.7% cited distrust of banks. These figures describe reasons people reported; they do not show how many were denied an account specifically because of KYC.