You cleared the first hurdle. The casino requested that you provide your ID and a bill from a utility company; you sent them those documents, they verified you, and you thought it was all over. However, then you win a large amount of money and you receive a request for bank statements, pay slips, or some form of information about how the money you deposited into their casino account was obtained. If you have reached this site in search of an answer in a bit of panic, then here is the quick version: a request for a casino source of funds is common practice, not an accusation, and is easy to respond to.

What “Source of Funds” Actually Means

When a casino is asking for a source of funds, what it actually wants from you is to prove, with documents, the source of funds in your account. Source of funds is not an attempt to prove that you are wealthy or justify your gambling activities. It is a particular AML compliance check that casinos have to conduct for their regulated operations when certain deposit and withdrawal thresholds are met.

Regulators like the UK Gambling Commission and the Malta Gaming Authority require licensed organizations to know the source of funds of the players, in most cases to ensure that the casinos do not become channels of money laundering in the case where the source of money is not legal. This, from the casino’s point of view, is not something to be chosen; in other words, failing to carry out this process correctly is one of the quickest ways to lose your license.

Source of Funds vs. Source of Wealth: Not the Same Thing

This distinction trips a lot of players up, and it’s worth being clear on it before you start gathering paperwork. Source of funds vs source of wealth comes down to two different questions:

• Source of funds asks where the specific money in your gambling account came from, this deposit, this balance, this recent income.
• Source of wealth asks a broader question, how you’ve built your overall financial position over time, which can include savings, inheritance, property, investments, or business ownership.

Most players will only ever be asked for a source of funds, proof tied to the money actually sitting in or moving through their casino account. Source of wealth checks are more intensive and typically only come into play for very large sums, high-stakes VIP accounts, or cases where something in a player’s profile has raised a broader red flag. 

If you’re being asked a simple “where did this deposit come from” question, you’re almost certainly dealing with a source of funds request, not the more involved wealth check, so don’t over-prepare or panic that this is a deeper investigation than it actually is.

What to Actually Send

The exact documents a casino will accept vary by operator, but a proof of funds casino request typically accepts some combination of the following:

Payslips: Usually the last two or three, showing your employer, regular income, and pay dates.

Bank statements: Recent statements showing the deposit in question moving from your account to the casino, with your name and account number visible.

A letter from your employer: Sometimes accepted as a substitute or supplement to payslips, confirming your role and salary.

Tax returns or self-assessment documents: Common for self-employed players who don’t have traditional payslips.

Proof of a specific windfall: Documentation for an inheritance, property sale, redundancy payout, or similar one-off event, if that’s genuinely the source of the funds in question.

A few practical tips make this go faster. Redact anything genuinely sensitive that isn’t relevant (full account numbers beyond the last few digits are sometimes fine to obscure, though check what the specific casino requires), make sure names and dates on the documents clearly match your account details, and send clean, legible scans or photos rather than blurry phone pictures that will just bounce back asking for a resend. The single biggest driver of delay in these requests isn’t the check itself, it’s incomplete or mismatched documentation going back and forth multiple times.

Why This Isn’t the Casino Accusing You of Anything

It’s an understandable instinct to feel defensive when a company you’ve been giving money to suddenly wants proof of your income. But a source of funds request is close to the opposite of an accusation, it’s the casino demonstrating it’s actually following the rules that keep it licensed and keep the industry from becoming a laundering vehicle. 

Legitimate operators run these checks on ordinary players constantly, triggered by thresholds and automated flags, not by suspicion of any individual wrongdoing. The players who should actually worry are the ones who can’t produce any documentation at all for where their money came from, for everyone else, this is paperwork, not an investigation.

This Is Part of a Pattern, Not a One-Off

If this feels familiar, it’s because it’s the same basic story as the ID request that likely came before it. Casinos verify who you are before your first withdrawal, and they verify where your money came from once your activity crosses certain thresholds, two separate checks, same underlying reason: regulators require it, and it protects legitimate players from platforms that would rather cut corners. If you haven’t already, it’s worth reading Why Casinos Ask for ID After You Win to understand the first half of this process, since source of funds requests almost always follow the same identity verification most players already went through.

And if you’re choosing where to play in the first place, it’s worth knowing that not every operator runs this process the same way, some ask for documentation clearly and early, others spring it on players at the worst possible moment with vague instructions. That’s exactly the kind of detail The Casino Feed checks and rates as part of every casino review, so you know what to expect from a payout process before you’re the one scrambling for payslips mid-withdrawal.