Casino Asking for 'Source of Funds'? What It Means + What to Send (2026)

Last updated: 28 July 2026

If an online casino asks for source of funds (often shortened to SoF), they're asking you to show where the money you're gambling with comes from. This is a routine part of anti-money laundering (AML) and Know Your Customer (KYC) checks at many licensed casinos.

Most requests happen when you make a withdrawal, significantly increase your deposits, or your account activity triggers a routine compliance review. Although it can feel intrusive, a Source of Funds check doesn't automatically mean there's a problem with your account.

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What does 'source of funds' mean at an online casino?

Source of funds means evidence showing where the money came from that you're using for gambling (deposits) or trying to cash out (withdrawals). In plain terms: the casino wants to see that the funds are from a legitimate source and that the payment activity makes sense for your profile.

• Source of funds (SoF) = the money behind your deposits/withdrawals (salary, savings, sale of an asset, etc.).
• Source of wealth (SoW) = broader picture of how you built your overall wealth (business ownership, investments over time, inheritance, etc.).
• Some casinos use SoF/SoW loosely - if you're unsure, ask them to confirm which one they need.

Why do casinos ask for source of funds?

Licensed casinos are required to carry out Know Your Customer (KYC) and anti-money laundering (AML) checks. A Source of Funds request is simply one way of confirming that the money used for gambling comes from a legitimate source.

Even if you've done nothing wrong, casinos may ask for extra verification when your gambling activity changes significantly or crosses internal risk thresholds. During this review, withdrawals are often placed on hold, so it's worth asking for a case number, a checklist of the exact documents required, and an estimated review timeframe.

Common triggers for a SoF request

• First big withdrawal (especially if you've never cashed out before).
• Larger-than-usual deposits or a sudden increase in gambling spend.
• Unusual deposit patterns (many small deposits, rapid deposits, frequent reversals).
• Payment method changes or a mismatch between deposits and withdrawals.
• Crypto activity (the casino may want to understand where the crypto came from and how it was obtained).
• Jurisdiction / licensing requirements (some markets are stricter than others).

What documents do casinos accept for 'source of funds'?

Every casino has its own compliance procedures, but the examples below cover the documents most commonly requested. Start with the simplest document that clearly supports your explanation, and only provide additional evidence if the casino asks for it.

If your gambling funds come from more than one source - for example salary and savings - explain that at the outset. Giving support the full picture often reduces unnecessary back-and-forth.

Source of Funds Examples and Accepted Documents

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1) Salary / employment income

• Recent payslips (often 1-3 months).
• Bank statements showing salary payments landing in your account.
• Employment letter (sometimes accepted, often not required if payslips + bank entries are clear).

2) Savings

• Savings account statement showing balance and/or transfers to your main account.
• Bank statements showing gradual accumulation (some casinos accept a shorter date range).

3) Self-employed / business income

• Business bank statements.
• Invoices/receipts + proof of payment.
• Tax documents (only if specifically requested).

4) Sale of an asset (car, property, investments)

• Proof of sale (sale contract) + bank entry showing funds received.
• Broker statement (for investments) + corresponding bank entries.

5) Inheritance / gift

• Inheritance letter / legal documentation + bank entry showing funds received.
• Gift letter + bank transfer proof (some casinos may refuse 'gift' as a standalone explanation without more context).

6) Crypto (proceeds from buying/selling, mining, etc.)

Crypto can require extra clarity because casinos may want to see the trail from purchase to sale/transfer.

• Exchange statements showing purchase history and transfers.
• Wallet transaction history (if requested) + explanation of addresses used.
• Bank entries showing fiat deposits to an exchange (if relevant).

How to send Source of Funds documents safely

Sending Source of Funds documents securely protects your personal information and helps avoid unnecessary delays. Clear, relevant documents are usually processed much faster than incomplete uploads or large batches of unnecessary paperwork.

Before uploading anything, keep these practical tips in mind:

• Use the casino's secure upload area whenever possible instead of email or live chat.
• Redact carefully: you can often hide unrelated transactions while keeping your name, dates and the relevant incoming funds visible.
• Only send what's requested. If the casino asks for proof of salary, begin with a payslip and the matching bank statement rather than sending months of financial records.
• Check image quality: make sure all corners are visible, nothing is blurred, and names and dates can be read easily.
• Request written confirmation that your documents have been received and accepted for review.

Copy/Paste Message for Casino Support

This template reduces back-and-forth and helps you get a specific checklist:

Red flags: when a 'source of funds' request becomes stalling

Most Source of Funds checks are completed without any issues. The concern is when a casino uses the process to delay withdrawals without clearly explaining what it needs or when the review will finish.

If you notice any of the following, it's worth asking for written clarification and keeping copies of all communication.

• The casino won't say what documents are acceptable, or keeps changing requirements after you comply.
• No clear timelines ('just wait') and no confirmation that uploads were accepted.
• They request irrelevant documents (far beyond what's needed) without explaining why.
• Support is vague about licensing/complaints routes or refuses to provide a formal complaint method.
• You're encouraged to deposit more while withdrawals are blocked.

FAQ: Source of funds (online casinos)

What does 'source of funds' mean at an online casino?

Source of funds (SoF) means evidence showing where the money you are depositing or withdrawing comes from (for example salary, savings, business income, sale of an asset, or crypto proceeds). Casinos may request it as part of KYC/AML checks.

Is source of funds the same as source of wealth?

Not always. Source of funds is about the specific money used for gambling (the funds behind deposits/withdrawals). Source of wealth is broader and relates to your overall financial situation (how you built your wealth over time). Some casinos use the terms interchangeably.

When do casinos ask for source of funds?

It often happens during withdrawals, after larger deposits, if your activity changes suddenly, or if the operator's risk checks flag something unusual. It can also happen on first withdrawals depending on the casino and country.

Will a source of funds request delay my withdrawal?

It can. Many casinos will pause withdrawals until the SoF review is completed. Ask for a case number, the exact checklist of documents, and a review timeframe. If you've completed (or are not asked for) Source of Funds checks and you're still waiting for payment, see our withdrawal delays guide.

What documents can I use for source of funds?

Common examples include payslips and bank statements (salary), savings account statements, business invoices and tax documents (self-employed), proof of sale of an asset, inheritance/gift documentation, and crypto exchange statements showing purchase and sale history.

Should I send full bank statements to a casino?

Only send what the casino specifically requests, using the casino's secure upload area if possible. You can often redact unrelated transactions while keeping your name, account details (as required), dates, and relevant incoming funds visible. If you're unsure, ask support exactly what information they need.

Is a source of funds request a sign a casino won't pay?

Not necessarily. Many legitimate casinos request SoF as part of compliance checks. The red flag is when the casino keeps changing requirements, refuses to explain what it needs, or uses SoF as an endless stalling tactic without clear timelines.