Being asked for a bank statement or payslip by a casino feels intrusive in a way an ID check doesn’t — it’s your finances, not just your name. But a source of funds (SoF) request isn’t the casino being nosy, and it isn’t optional for them: anti-money-laundering law obliges UK operators to establish that gambling money comes from legitimate sources, and the request lands on you because something in your account activity crossed one of their thresholds. Here’s what triggers it, exactly which documents work, and what happens if you don’t engage.
If the review is holding up a payment, compare the normal stages in our pending-withdrawal guide. If the operator restricts or closes the account, use the steps for a casino account closed with a balance.
What a Source of Funds Check Actually Is
A source of funds check is the casino asking you to evidence where the specific money you’re gambling with came from. It’s a legal duty, not a policy choice: UK-licensed operators fall under anti-money-laundering regulations, and the Gambling Commission expects them to apply customer due diligence whenever transactions look unusual for the account — and regulation 27 of the Money Laundering Regulations 2017 sets a hard floor, requiring due diligence on any transaction of £2,000 or more, in one operation or several linked ones. It’s a different exercise from identity verification — KYC confirms who you are; SoF confirms your money is clean. Many players meet both for the first time in the same week, which is why they blur together (our separate KYC documents guide covers the identity side).
What Triggers One
Operators don’t publish their exact thresholds — deliberately, since publishing them would tell launderers exactly how to stay underneath — but the common triggers are consistent across the industry:
- Deposits that jump sharply above your established pattern, or large sums deposited quickly.
- A large withdrawal, particularly a first one, or one following a big win.
- Cumulative spend crossing internal AML thresholds — due diligence obligations tighten as lifetime deposits build.
- Payment behaviour that looks like layering — multiple methods, rapid deposit-withdraw cycles, or third-party payment flags.
Affordability Checks Are a Different Thing: the 2026 Position
Players often lump source of funds requests together with “affordability checks”, but as of 2026 the regulator has deliberately split them, and neither of the two affordability mechanisms should involve you sending paperwork. Light-touch financial vulnerability checks have been mandatory since 30 August 2024, triggered at £500 of net deposits in a rolling 30-day period initially and at £150 since 28 February 2025. They use only publicly available records — bankruptcies, County Court Judgments, Individual Voluntary Arrangements and similar — and the Gambling Commission reported in May 2026 that around 7 per cent of active accounts were being checked, 78 per cent of them inside ten minutes, with nothing requested from the customer.
The second mechanism, financial risk assessments, is the successor to the controversial post-white-paper “affordability checks”. On 7 July 2026 the Commission confirmed a staged rollout: stage one applies only to the largest operators and only at £5,000 or more of net deposits in a rolling 24-hour window (£2,500 for under-25s), a pattern fewer than 0.5 per cent of customers ever hit. The assessments draw on four limited credit reference data points, were 97 per cent frictionless in the pilot, are invisible to lenders and do not affect your credit score.
The practical upshot: an operator citing “affordability” while demanding bank statements in 2026 is applying its own risk appetite rather than a regulatory documents requirement, and you have more room to push back — our guide to refusing a casino affordability check covers your options. A source of funds request under money laundering law is the one that is much harder to argue with.
Documents That Pass
What the casino needs is a paper trail connecting the gambling money to a legitimate origin. The standard menu:
- Bank statements — usually the last 3–6 months, showing your name, account details and the incoming payments that funded your deposits.
- Payslips — recent (typically within three months) to evidence regular employment income.
- Self-employment evidence — an HMRC SA302 tax calculation, recent tax returns, invoices or business bank statements.
- One-off sources — property sale completion statements, inheritance letters, pension statements or documented lottery/gambling wins for lump sums (the winnings themselves are tax-free in the UK; what matters is the trail proving that is what they are).
The document needs to actually explain the money in question. A payslip showing £2,000 a month doesn’t, on its own, explain £15,000 of deposits — mismatched evidence is the most common reason these reviews drag into a second round.
Source of Funds vs Source of Wealth
You may also hear “source of wealth” (SoW). The distinction matters: SoF asks where this specific money came from; SoW asks how you built your overall financial position, and typically appears for sustained high-value play rather than a single large transaction. SoW requests cast a wider net — savings history, investments, property — and generally signal that the operator sees you as a long-term high-value customer it needs to fully understand to keep serving lawfully.
What Happens If You Refuse
Not engaging doesn’t make the check disappear — it forces the operator’s hand. Expect the account to be restricted, withdrawals paused, and eventually the account closed, because a casino that can’t complete required due diligence isn’t allowed to keep taking your bets. Importantly, your existing balance doesn’t stop being yours: the funds should be returned once the operator can lawfully release them, though an unresolved AML review can hold that up considerably. Stonewalling is the slowest possible route to your own money.
Redaction and Your Data Protection Rights
You do not automatically have to hand over every line of your financial life. In a Freedom of Information response the Gambling Commission confirmed it has “not specified any policy or any expectations in respect of redacted documents” for verification by online operators, and UK GDPR’s data minimisation principle requires that data collected be “adequate, relevant and limited to what is necessary”. A sensible middle ground: leave your name, address, account details, dates, balances, income credits and gambling transactions visible, and black out unrelated outgoings.
Know the limit of this right, though. An operator assessing money laundering risk can reasonably argue it needs the unedited picture, and it is entitled to decline a document it considers over-redacted. If a request feels disproportionate, ask what each field is needed for, and complain to the ICO if the answer does not stack up.
Getting Through It Faster
- Send exactly what’s asked for, in full — complete statements, not cropped screenshots with the balance cut off.
- Make sure names and addresses match across the documents and your casino account.
- Cover the actual money — if your deposits came from savings, show the account they sat in, not just your salary slip.
- Ask what’s outstanding if a week passes with no update; reviews genuinely do get stuck in queues, and a polite nudge with a complete file moves you up it.
How you deposit changes what these checks look like. Open banking deposits already show your bank a verified picture, while cash-funded methods such as paysafecard keep gambling off your statement entirely, and that absence is often what prompts an operator to ask for the statement in the first place.
Verdict
A source of funds check is the least avoidable and most misunderstood friction in UK online gambling: legally mandated, deliberately opaque in its triggers, and entirely survivable with the right documents. Treat it as an evidence exercise — connect the money to its origin, match the details, send complete files — and it usually resolves in days. Fight it, and it’s your withdrawal that sits hostage while you do.
Source of Funds FAQs
Is a source of funds check legal?
Yes — it’s legally required. UK-licensed casinos fall under anti-money-laundering regulations and must evidence that gambling money comes from legitimate sources when activity triggers due diligence.
Why was I asked when my friend never has been?
Checks are triggered by account behaviour — deposit size, speed, cumulative spend and win patterns — not applied uniformly. Different play patterns produce different flags.
Can the casino keep my money if I don’t send documents?
No — the balance remains legally yours — but the account can be restricted and closed, and payout can be substantially delayed until the operator can lawfully release the funds.
How recent do bank statements and payslips need to be?
Typically the last three months for payslips and three to six months for bank statements, showing your name and full account details.
What if my money came from savings built up over years?
Show the savings account itself alongside evidence of how it was built (salary history, sale proceeds, etc.). The goal is a coherent trail to the deposits, not just proof you have income.
Can I redact parts of my bank statement?
Often, yes. The Gambling Commission has confirmed it sets no rules against redacted documents, and data minimisation under UK GDPR supports sharing only what is necessary. Keep your name, account details, dates, balances, income and gambling transactions visible; be aware an operator can still insist on unredacted copies for a money laundering review.
Is source of wealth the same thing?
No — source of funds covers the specific money you’re gambling with; source of wealth covers your overall financial position, and tends to apply to sustained high-value play.
Sources & Verification
Primary sources checked 9 July 2026: UKGC: Source of funds evidence. Updated 13 August 2026 against: Money Laundering Regulations 2017, regulation 27 (£2,000 casino due diligence threshold); UKGC: light-touch financial vulnerability checks; UKGC news, 7 July 2026: staged financial risk assessments; UKGC FOI response on redacted documents; ICO: data protection principles.
