Source of funds checks: what they are and why gambling operators run them

What a source of funds check actually is

A source of funds check is a request from a gambling operator for evidence showing where the money a customer is spending, or has spent, actually came from. It is distinct from simply verifying who someone is (identity verification) or checking they are old enough to gamble (age verification). The question here is narrower and more probing: can this person show, credibly, that their income or savings are enough to support the level of play the operator is seeing?

This sits within the wider anti-money laundering and social responsibility framework that licensed operators must run, but it is worth treating as its own topic because it is one of the most common points of friction between operators and customers, and one of the most frequently misunderstood by players.

Why operators run these checks

Licensed gambling businesses in Great Britain have to meet requirements set out in the Gambling Commission’s Licence Conditions and Codes of Practice (LCCP), which cover both anti-money laundering obligations and customer interaction for safer gambling purposes. Source of funds checks serve two overlapping goals.

First, they are an anti-money laundering control. Gambling has historically been identified as a sector that criminals can try to use to move illicit cash, disguising it as gambling stake or winnings. Asking a customer to prove where large sums came from is one of the standard ways any regulated financial or gambling business tries to stop that happening.

Second, source of funds evidence increasingly doubles as a safer gambling signal. If a customer’s spending pattern looks disproportionate to their evident means, that can be a marker of harm as much as a marker of financial crime risk, and operators are expected to act on both.

What usually triggers a check

Operators do not ask every customer for proof of income. Checks are typically triggered by risk indicators built into an operator’s own policies, which commonly include:

• A customer’s deposits or losses reaching a certain level within a defined period
• A sudden and significant increase in spending compared with a customer’s established pattern
• Unusual account activity, such as unexplained transfers between accounts or rapid deposit-and-withdraw cycles
• Behavioural signs that combine with spending levels, such as chasing losses or spending outside what the operator would consider affordable

Because these thresholds are set by each operator’s own risk assessment rather than fixed by law at a single number, there is no universal figure that applies across every site or every product. Two operators can, quite legitimately, ask for evidence at different spending levels because their customer bases and risk models differ.

What counts as acceptable evidence

Operators generally look for documentation that independently confirms income or wealth rather than a customer’s own account of their finances. Common examples include:

• Payslips or an employer’s letter confirming salary
• Recent bank statements showing regular income or accumulated savings
• Self-assessment or tax return documents for the self-employed
• Evidence of a lump sum, such as an inheritance letter, a pension statement or proceeds from a property sale
• Business accounts or dividend statements for company owners

A screenshot of a bank balance on its own usually is not enough, because it shows what money is there now, not where it came from. Operators are looking for a plausible, evidenced link between a customer’s known financial position and the amounts being wagered.

What happens if a customer cannot or will not provide it

Under the LCCP, operators are expected to restrict an account, for example by limiting deposits or pausing play, until a satisfactory source of funds picture is established where the risk indicators warrant it. This can feel abrupt to customers who are used to instant withdrawals and deposits, but it reflects a regulatory expectation rather than an operator being obstructive. Reputable operators should explain clearly what is needed and why, and should not make the process more invasive than necessary for the risk identified.

Customers who feel a request is unreasonable, or that their account has been frozen without proper explanation, can raise a complaint with the operator in the first instance and, if unresolved, escalate it to an alternative dispute resolution provider approved for gambling complaints, or contact the Gambling Commission.

Why this matters for the industry

For operators, getting source of funds checks right is a genuine compliance tightrope. Too light a touch risks regulatory action and reputational damage if the business is later found to have accepted proceeds of crime or allowed harmful spending to continue unchecked. Too heavy a touch drives customers towards unlicensed operators who ask no questions at all, undermining the point of regulation altogether. The Gambling Commission has repeatedly signalled that proportionate, evidence-based checks, applied consistently and explained clearly to customers, are what it expects to see from licensed businesses.

For readers working in or covering the sector, the key point is that source of funds is not a box-ticking exercise bolted onto sign-up. It is an ongoing, risk-based process that follows a customer’s account activity over time, and the specific triggers and documentation requirements are for each operator to set within the framework the regulator provides. Anyone wanting the current detail on thresholds, expectations or enforcement action should check directly with the Gambling Commission.

Where to check current detail

Rules, guidance and enforcement expectations around source of funds checks can change, so always verify specifics against the primary regulator rather than relying on any fixed figure.