The UK Financial Conduct Authority (FCA) has recently imposed a hefty fine of £21,091,300 on Monzo Bank Ltd for serious shortcomings in its anti-financial crime systems and controls. This penalty, covering the period from October 2018 to August 2020, highlights persistent compliance gaps in the fintech sector. Additionally, Monzo was found to have repeatedly breached a regulatory requirement prohibiting it from opening accounts for high-risk customers between August 2020 and June 2022.
This article examines the FCA’s findings, the broader implications for UK banks—especially challenger banks and fintechs—and the critical lessons for financial institutions in combating financial crime.

The FCA’s Fine and What It Means
In a statement published on FCA’s website, the regulator emphasised that Monzo failed to maintain adequate anti-money laundering (AML) and counter-terrorist financing (CTF) controls. These failures created vulnerabilities that could have been exploited by criminals, undermining the UK’s financial system integrity.
Monzo’s repeated breaches regarding the onboarding of high-risk customers despite explicit restrictions demonstrated systemic weaknesses in governance and oversight. The FCA’s action serves as a stark reminder that even innovative digital banks must meet rigorous standards to safeguard against financial crime.
Key Areas of Concern Highlighted by the FCA
1. Inadequate AML/CTF Systems and Controls
Between October 2018 and August 2020, Monzo’s systems were insufficiently robust to detect and prevent suspicious transactions. This included weaknesses in transaction monitoring, risk assessments, and customer due diligence.
- Transaction Monitoring Failures: The FCA found that Monzo’s monitoring systems did not effectively flag suspicious activity patterns that could indicate money laundering.
- Risk Assessment Shortcomings: Monzo’s risk-based approach to customers and transactions was not properly tailored or consistently applied.
- Insufficient Customer Due Diligence: There were failures in verifying customer identity and ongoing monitoring of high-risk accounts.
2. Breach of Restrictions on High-Risk Customer Onboarding
From August 2020 to June 2022, Monzo repeatedly opened accounts for customers that the FCA had identified as high risk, breaching a formal restriction imposed to mitigate money laundering risks.
This behaviour underscored governance lapses and inadequate internal controls, highlighting a failure to implement regulator-mandated safeguards effectively.

Broader Implications for the UK Banking Sector
Fintechs and Challenger Banks Under the Microscope
Monzo’s case exemplifies the challenges fintechs face as they scale rapidly while maintaining regulatory compliance. The FCA is increasingly scrutinising how new digital entrants embed anti-financial crime controls within innovative business models.
Reinforcing the Vital Role of Banks in Fighting Financial Crime
Banks act as a crucial frontline defence in the global fight against money laundering and terrorist financing. Failures like those at Monzo can damage public trust and increase risks to the broader financial system.
The FCA’s enforcement action sends a clear signal: all firms, regardless of size or tech focus, must prioritise robust compliance frameworks.

What Financial Institutions Must Do
Strengthen AML and CTF Frameworks
- Enhanced Transaction Monitoring: Utilise advanced analytics and AI to detect complex and evolving money laundering typologies.
- Tailored Risk Assessments: Continuously update risk models to reflect customer behaviour and emerging threats.
- Robust Customer Due Diligence: Ensure strict identity verification and ongoing monitoring, especially for high-risk clients.
Governance and Accountability
Senior management must foster a compliance culture where controls are rigorously tested and issues are escalated promptly.
Collaboration with Regulators
Proactive engagement with the FCA and other regulatory bodies can help anticipate compliance expectations and implement best practices.
Conclusion
The FCA’s £21 million fine against Monzo Bank underscores the non-negotiable importance of strong anti-financial crime controls in today’s banking environment. For fintechs and traditional banks alike, compliance failures carry hefty financial and reputational consequences.
As digital banking continues to evolve, firms must invest in sophisticated systems, cultivate risk-aware cultures, and work closely with regulators to uphold the integrity of the UK’s financial sector.
References
- Financial Conduct Authority (2023). FCA fines Monzo Bank Ltd £21,091,300 for anti-financial crime failings
- UK Government. Money laundering, terrorist financing and transfer of funds regulations
- Transparency International (2022). Global Financial Integrity Report