Disputes with banks/payment systems over financial monitoring: how to challenge account restrictions

Financial monitoring has become an integral part of how banks and payment service providers operate. For businesses, however, it increasingly turns into a source of serious disputes. Transaction restrictions, service suspensions, or fund freezes can effectively paralyse a company’s operations, even where no violations have been proven. At the same time, banks and PSPs typically refer to regulatory requirements and refuse to disclose the details behind their decisions. This information asymmetry places clients in a vulnerable position and creates the impression that no effective legal remedies are available. However, the actions of financial institutions are subject to legal scrutiny and can be challenged. This article explains how disputes with banks and payment systems over financial monitoring arise and which legal tools can be used to dispute account restrictions.

What do banks and payment systems mean by “financial monitoring”

For banks and payment service providers, financial monitoring is not a one-off check but an ongoing process of assessing client activity from an AML/CTF and regulatory compliance perspective. It covers both initial customer due diligence (KYC) and ongoing monitoring of transactions, bank account behaviour, and changes in the client’s risk profile. Financial monitoring applies not only to high-risk businesses but also to ordinary corporate clients, particularly in fintech, e-commerce, IT, and cross-border payments.

It is important to understand that, for banks and PSPs, financial monitoring is a regulatory obligation, not a discretionary right. Regulatory frameworks require them to identify, analyse, and, where necessary, restrict transactions that may be linked to money laundering, sanctions evasion, or other financial crimes. As a result, account restrictions are increasingly viewed by banks as a risk-management tool rather than a sanction against a specific client.

Typical trigger events

Decisions to apply enhanced control or restrict operations are rarely arbitrary. They are usually based on a combination of risk triggers identified under a risk-based approach. The most common include:

1. Inconsistencies between the client’s profile and transaction activity (unexpected amounts, sudden increases, atypical counterparties);
2. Complex or opaque payment chains, including intermediaries without clear economic rationale;
3. Geographic factors, such as payments to or from high-risk jurisdictions or countries subject to heightened sanctions scrutiny;
4. Incomplete or outdated KYC data, including information on beneficial owners or source of funds;
5. Signals from external systems, such as sanctions lists, adverse media, or internal bank or PSP alerts.

A single red flag does not always result in a restriction, but a combination of triggers significantly increases the likelihood of measures being applied. For clients, the key issue is that such triggers are often identified retrospectively, after operations have already begun.

Types of restrictions

Depending on the risk level and internal procedures of the bank or payment system, financial monitoring may result in different types of restrictions. In practice, the most common are:

1. Requests for additional documentation and enhanced due diligence;
2. Temporary limits or partial blocking of specific transactions;
3. Suspension of outgoing or incoming payments;
4. Freezing of funds pending completion of a review;
5. Termination of the relationship and account closure.

For businesses, even “soft” restrictions can lead to payment delays, disrupted contracts, and reputational damage. This is why understanding the logic of financial monitoring is the starting point for developing an effective strategy to challenge the actions of a bank or PSP.

Legal and regulatory framework

Financial monitoring and related account restrictions are based not on the “internal discretion” of banks or payment systems, but on a set of mandatory regulatory requirements. The core problem for businesses is that banks often implement these obligations in an overly strict manner, without properly balancing compliance duties and clients’ rights.

AML/CTF obligations and the risk-based approach

Financial monitoring is grounded in anti-money laundering and counter-terrorist financing requirements set out in FATF standards and implemented in national legislation. Banks and PSPs are required to apply a risk-based approach, under which clients and transactions are assessed by risk level and control measures must be proportionate to the identified risks.

In practice, this means that:

• Not every atypical transaction automatically justifies an account freeze;
• The bank must be able to explain which specific risk was identified;
• Control measures must reflect the nature of the client’s business rather than impose blanket restrictions.

Breaches of the proportionality principle are often a key argument when challenging account restrictions.

Payment regulation angle (for PSPs)

Payment systems and electronic money institutions (EMIs) are also subject to specific payment regulation requirements. In the EU, these include PSD2/PSD3 and rules governing safeguarding of client funds, KYC procedures, and ongoing monitoring. Similar frameworks apply in other jurisdictions, where PSPs must combine payment services with AML controls.

It is important to note that:

• Payment providers often apply more conservative risk models than banks;
• Automated monitoring systems may trigger restrictions without individual assessment;
• Contractual terms of PSPs may broaden their discretion but do not override regulatory principles of reasonableness and good faith.

First 24-48 hours: what to do immediately

The first 24-48 hours after an account freeze or transaction restriction are critical for the eventual outcome of a dispute with a bank or payment service provider. This is when the institution’s initial position is formed, the basis for the monitoring decision is recorded, and the evidentiary record is built – one the bank or PSP will rely on later. Missteps at this stage (emotional emails, incomplete replies, or attempts to bypass restrictions) often materially weaken the client’s position.

Evidence preservation and internal triage

The first step is to capture and preserve all available information related to the restriction. This includes the bank’s/PSP’s notices, in-portal messages, email correspondence, and any stated reasons for the block (even if phrased in general terms). Preserve message metadata and receipt dates, as they may matter when assessing procedures and deadlines.

In parallel, run an internal triage:

1. Identify what product is affected (current account, payment account, acquiring, e-money);
2. Confirm the bank’s/PSP’s jurisdiction and the governing agreement;
3. Determine which transactions and amounts are actually frozen and whether any balances remain accessible.

At this stage, also assess whether the restriction is linked to AML/CFT review, sanctions screening, fraud monitoring, or a risk-appetite reassessment, even a preliminary view shapes the next steps.

First response to the bank/PSP

Early communication with the bank or PSP should be tightly drafted. The goal of the first response is not to argue the merits, but to secure a procedural position and request specifics. Practice shows that a well-structured initial letter increases the chances of a more transparent dialogue with the compliance team.

In the first outreach, it is advisable to:

1. Acknowledge receipt of the notice and confirm willingness to cooperate;
2. Request the legal and factual basis for the restriction (to the extent permissible);
3. Clarify what documents or information are required for the review;
4. Set reasonable timelines for a response and for restoring access (if applicable).

Avoid wording that could be read as an admission of wrongdoing, as well as pressure tactics or threats. Even if the restriction appears unfounded, the tone and structure of the first response directly affect any further escalation.

How to form a strong challenge package

After the initial steps taken within the first 24-48 hours, the key task for the business is to build a legally sound challenge package capable of persuading the bank’s or PSP’s compliance team. In practice, success depends not on emotional arguments, but on how clearly the company demonstrates risk control, operational transparency, and compliance with AML/CTF requirements. A strong challenge package should reduce the bank’s perceived risk and show that continuing the relationship does not create regulatory exposure.

Documents that usually matter

While the exact set of documents depends on the jurisdiction and business type, banks and payment systems typically expect a structured and coherent body of evidence. Excessive or disorganised submissions often work against the client.

Key documents usually include:

• Corporate records and beneficial ownership information (UBO, group structure);
• Contracts with counterparties and explanation of the economic purpose of transactions;
• Evidence of source of funds and business activity;
• Description of the business model and payment flows;
• Internal AML/KYC policies and procedures (where applicable);
• Explanations of specific transactions that raised alerts.

It is essential not only to provide documents, but to demonstrate their internal consistency and alignment with the stated business model.

Narrative that reduces risk score

Alongside documentation, an explanatory narrative is critical to clarify transaction logic and lower the client’s risk profile in the bank’s assessment. Many prolonged blocks result from the bank’s inability to understand the economic substance of transactions or from perceived inconsistencies between the client profile and actual flows.

An effective explanation typically covers:

• The payment chain and the company’s role within it;
• Sources and uses of funds;
• Mitigation of red flags (geography, intermediaries, volumes, frequency);
• Internal control and monitoring measures.

This approach shifts communication from a “suspicion–defence” dynamic to a risk-based dialogue, significantly increasing the chances of lifting restrictions or restoring partial account access.

Complaint and escalation routes

If initial communication with a bank or payment system does not lead to lifting the restrictions, the next step is a structured escalation of the dispute. It is important to understand that different complaint channels serve different purposes: some are aimed at internal review, while others involve external oversight of regulatory compliance. A well-designed escalation strategy increases the chances of revising the measures and builds an evidentiary basis for any further dispute.

Internal complaints procedure

The first mandatory stage is an internal complaint to the bank or PSP. In many jurisdictions, compliance with the internal procedure is a prerequisite for any external escalation. The complaint should be submitted in writing, clearly setting out facts, dates, and specific requests.

In practice, it is important to consider:

• The addressee of the complaint (compliance department, risk committee, dedicated complaints unit);
• Formal requirements for structure and filing deadlines;
• The bank’s obligation to provide a reasoned response within a prescribed timeframe.

A properly filed internal complaint often leads to a review of restrictions, especially where the client demonstrates cooperation and provides the requested information in full.

External escalation (jurisdiction-dependent)

If the internal procedure fails, external escalation may be available, depending on the jurisdiction and the status of the financial institution. In some countries, clients may approach a financial ombudsman, regulator, or specialised supervisory body.

External escalation may include:

• Complaints to regulators (central bank, financial supervisor);
• Applications to an ombudsman or alternative dispute resolution mechanisms;
• Regulatory inquiries into compliance with proportionality and the risk-based approach.

Such bodies rarely order a bank to reopen an account, but they assess procedural compliance and may influence the bank’s position in a specific case. For international clients, it is particularly important to identify the jurisdiction of the account and the regulator competent to review the complaint.

How Key2Law helps challenge bank and payment system restrictions

Disputes with banks and payment systems arising from financial monitoring require a precise understanding of regulatory logic, internal review procedures, and the actual limits of discretion exercised by financial institutions. Incorrect or delayed actions by the client often lead to prolonged restrictions, account closures, or loss of access to payment infrastructure. Key2Law team helps clients develop a legally grounded defense strategy strategy and increase the chances of lifting restrictions.

Key2Law assists clients with:

• Comprehensive analysis of the grounds for account restrictions or blocking by banks or payment systems;
• Preparation and structuring of challenge packages in line with AML/KYC and sanctions compliance requirements;
• Interaction with compliance teams of banks and payment service providers;
• Handling complaints and escalations to supervisory authorities and alternative dispute resolution mechanisms;
• Assessment of litigation risks and development of court strategies where necessary;
• Support for companies with elevated risk profiles, including international and fintech businesses.

If your account has been blocked or transactions restricted due to financial monitoring, the Key2Law team is ready to assess the legal basis of the bank’s actions and develop an effective challenge strategy aligned with your business objectives.