Working out "How do casinos pay taxes?" means knowing which question is being asked. Money goes in with almost no questions and comes out with several, and that asymmetry catches most people at their first withdrawal. A casino is obliged to know who it is paying, where that person lives and where the money being staked came from, and it usually asks at the moment it is about to pay rather than when the account opened. Knowing which three checks exist, and what satisfies each, turns a stalled payout into a short errand.
Source of funds is the third and the one people find intrusive. It asks where the money being gambled came from, and the answer is a document rather than a sentence: payslips, a tax return, a contract of sale, a statement showing the deposit arriving from a named employer. A salary is a perfectly ordinary answer and so is a pension, a redundancy payment or a house sale. What fails is an answer with no paper behind it, because the check is not asking whether the story is plausible.
An answer that will not come has consequences worth knowing in advance. An account that cannot satisfy a source of funds request is usually frozen rather than closed, with the balance held until it can, and the deposits already made are normally returnable to their origin. That is the reason to deposit from an account in the same name from the start: every check further down the line reads more easily when the paper trail begins in the right place.
The order matters less than the timing. Identity and address are often asked once and never again; source of funds arrives later, usually when the totals passing through an account cross a threshold the operator does not publish. A payout that has sat pending for days while nothing was requested is worth a question to support, because a check waiting on a document nobody asked for is the commonest reason one stalls.
Common questions
What happens to the balance if an account is frozen?
The account is usually frozen rather than closed, the balance held until the source of funds is shown, and deposits are normally returnable to their origin.
What causes most identity check rejections?
A name that differs from the account name, such as a shortened first name, a maiden name or a middle name shown in only one place.
Are online banking screenshots accepted as proof of address?
Usually, when they show the bank's name, the account holder and the address together; a screenshot showing only a balance fails.
Why might a payout stay pending when nothing was requested?
A stalled payout is most often a check waiting on a document nobody has asked the player for, so a question to support is worthwhile.
When does each payout check usually arrive?
Identity and address are often asked once; source of funds comes later, when totals through the account cross a threshold the operator does not publish.
What does a source of funds check ask for?
Documents rather than explanations: payslips, a tax return, a contract of sale or a statement showing money arriving from a named employer.