KYB vs KYC: What’s the Difference and Why UK Businesses Need Both

In the years since the Economic Crime and Corporate Transparency Act 2023 reached the statute book, the Financial Conduct Authority (FCA) has sharpened its scrutiny of how regulated firms onboard new customers. UK compliance teams are now asking one question more than almost any other: what is the difference between Know Your Business (KYB) vs Know Your Customer (KYC), and do we really need both? The short answer is yes. KYC verifies an individual’s identity and risk profile. KYB does the same for a company. The two are often conflated, but they serve distinct purposes, and any FCA-regulated firm that onboards both consumers and businesses has to get both right. This guide breaks down the KYB vs KYC distinction, the UK rules that govern each, and how the two work together in practice.

What is KYC?

KYC, which stands for Know Your Customer, is the process of verifying an individual customer’s identity, assessing their money laundering and terrorist financing risk, and monitoring their activity throughout the business relationship. So when someone asks, “What does KYC stand for?” the answer is simply “Know Your Customer.” The KYC definition covers three core pillars: the Customer Identification Programme (CIP), which establishes who the customer is; Customer Due Diligence (CDD), which assesses their risk profile; and Ongoing Monitoring, which tracks the relationship over time.

When people ask “what does KYC mean” for their business, the honest answer is that it depends on the sector, because KYC applies wherever a regulated firm takes on individual customers: opening a bank account, lending, insurance, electronic money institution (EMI) onboarding, gambling, and crypto.

In the UK, KYC sits within the broader CDD obligations set out in the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 (MLRs 2017). CDD has three required elements: identifying and verifying the customer, identifying any beneficial owners, and understanding the purpose and intended nature of the relationship. This is supported by ongoing monitoring throughout the relationship. Higher-risk customers trigger Enhanced Due Diligence (EDD), while lower-risk scenarios may allow Simplified Due Diligence (SDD).

What is KYC in banking specifically? 

In banking, KYC is a mandatory requirement under the MLRs 2017 and FCA rules before any new customer can be onboarded, and it is one of the most heavily examined areas in FCA supervision. The meaning of know your customer in a banking context, therefore, extends well beyond account opening into transaction monitoring and periodic review. UK firms apply this framework in line with Joint Money Laundering Steering Group (JMLSG) guidance, the industry-standard interpretation of the regulations.

What is KYB?

So what is KYB? KYB, or Know Your Business, is the equivalent process applied when your customer is a company rather than an individual. The KYB meaning centres on verifying that a business is legitimate, identifying who controls it, and assessing the financial crime risk it poses.

Where KYC focuses on a single person, KYB has to unpick a legal entity: company registration and status, legal structure, registered directors, and ultimate beneficial owners (UBOs). In the UK, the primary data source is Companies House, including the People with Significant Control (PSC) register, which records individuals who own or control more than 25% of a company. The Economic Crime and Corporate Transparency Act 2023 has reshaped this landscape significantly: mandatory identity verification for new directors and PSCs came into force on 18 November 2025, with a 12-month phase-in for existing in-post directors and PSCs. Companies House also now has stronger powers to query and reject filings. These changes directly raise the bar for UK KYB.

In practice, KYB checks typically include Companies House verification, UBO and PSC identification, director screening, and sanctions and adverse media checks. KYB is especially critical for B2B fintechs, payment processors, and merchant acquirers, where the “customer” is almost always another business.

KYB vs KYC: What are the key differences?

The cleanest way to see what separates KYB from KYC in practice is side by side.

KYC at a glance

The subject is an individual. Typical data sources include the electoral roll, passports and driving licences, and credit reference agencies. The key checks cover identity verification, Politically Exposed Person (PEP) screening, and sanctions screening. The regulatory basis is the MLRs 2017 and JMLSG guidance. Complexity is comparatively lower because you are verifying a single person.

KYB at a glance

The subject is a legal entity. Data sources include Companies House, the PSC register, UBO data, and adverse media. The key checks cover company legitimacy, UBO and director identification, and sanctions screening. The regulatory basis spans the MLRs 2017, the Companies Act, and the Economic Crime and Corporate Transparency Act 2023. Complexity is higher because ownership can be layered across multiple entities and jurisdictions.

The core difference in KYB vs KYC comes down to complexity. Where KYC deals with a single individual, KYB must unpick layers of company ownership, directorship, and UBO structures before you can even begin to assess risk.

What is the UK regulatory framework for KYC and KYB?

Both KYC and KYB in the UK rest on a shared legal foundation, with some entity-specific additions.

• Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 (MLRs 2017): the primary UK legal basis for customer due diligence across both individuals and businesses.
• JMLSG guidance: the industry-standard interpretation of the MLRs 2017 that UK firms are expected to follow.
• Financial Conduct Authority (FCA): sets and supervises expectations around CDD, risk assessment, and ongoing monitoring for regulated firms.
• Economic Crime and Corporate Transparency Act 2023: mandatory identity verification for directors and PSCs is now in force (from 18 November 2025), with Companies House holding stronger powers to scrutinise filings. This is especially significant for KYB.
• UK GDPR: data minimisation and lawful basis requirements apply to the collection and storage of KYC and KYB data.

There is also a cross-border dimension. Since the UK’s departure from the EU, UK firms that operate in or alongside EU markets manage two distinct regulatory regimes, no longer with access to shared EU identity verification infrastructure. This adds meaningful operational overhead to onboarding and monitoring across both markets.

How do KYB and KYC work together in practice?

The KYB vs KYC distinction matters at the level of process design, but in practice, the two are deeply linked. For an FCA-regulated fintech onboarding a UK SME as a merchant, a unified process looks like this.

• KYB on the business: the fintech verifies the company against Companies House, identifies UBOs via the PSC register, and runs sanctions and adverse media screening on the entity.
• KYC on the people: each UBO and key individual (typically directors and significant controllers) undergoes KYC verification, including identity verification and PEP and sanctions screening.
• Unified risk scoring: the business-level and individual-level findings are combined into a single risk view rather than being stored in separate systems.
• Ongoing monitoring: both the entity and its individuals are monitored over time, so that changes in ownership, sanctions status, or behaviour are caught.

Run as separate, disconnected processes, and this becomes slow and error-prone. When KYB and KYC are run together in a single workflow, it becomes one coherent onboarding decision.

What challenges do UK firms face with KYB and KYC compliance?

UK firms consistently encounter the same pressure points when running KYB and KYC programmes.

• Fragmented tooling: separate KYC and KYB systems create blind spots, especially where an individual is both a personal customer and a controller of a business customer.
• UBO complexity: layered ownership, overseas holding companies, and nominee directors make it genuinely hard to establish beneficial ownership. Understanding the meaning of KYC checks at the individual level only helps if you can first map who the individuals actually are.
• Keeping pace with Companies House: the reforms under the Economic Crime and Corporate Transparency Act 2023 change what data is available and how reliable it is, requiring firms to update their KYB processes accordingly.
• High-risk third countries: onboarding entities or individuals connected to higher-risk jurisdictions requires EDD. See our guide to enhanced due diligence for more.
• Onboarding abandonment. friction has a commercial cost: around 30% of applicants abandon onboarding when the process is slow or repetitive.

How does technology help firms manage KYB and KYC together?

Modern compliance technology brings document checks, liveness detection, Companies House integration, and PEP and sanctions screening into a single workflow, so KYB and KYC stop being two disconnected projects. The practical gains are speed (RelyComply customers report up to 10x faster merchant onboarding), accuracy, comprehensive audit trails for FCA inspection, and scalability without proportional headcount growth. Configurable risk scoring means higher-risk entities and individuals automatically trigger EDD, while straightforward cases pass through quickly. Increasingly, regulated firms expect a single platform to handle both the business and the individuals behind it.

Getting KYB and KYC right

The KYB vs KYC distinction matters, but so does how you operationalise both. For FCA-regulated firms, the stakes are real: MLRs 2017 obligations, FCA enforcement, and the tightening requirements of the Economic Crime and Corporate Transparency Act 2023. Getting either wrong poses regulatory and commercial risks.

RelyComply works with FCA-regulated firms across the UK to deliver KYC and KYB compliance in a single platform, combining real-time Companies House verification, configurable risk scoring, and comprehensive audit trails. See how it works: arrange a demo.

KYB vs KYC: Frequently asked questions