bank asks for the source of the first deposit on the business account

Source of initial capital is a client due diligence question, not an annual accounts question

The bank is not asking this out of curiosity, but as part of the client due diligence under the Anti-Money Laundering and Terrorist Financing (Prevention) Act (Wwft). Answer therefore concretely and factually: was it the founder's own savings, a family loan, a share investment, a bank loan or a combination? Do not mention the amount unless the bank specifically asks for it, but do identify the source of the funds. This is substantively related to the source of the company's assets, but not identical: that question often concerns ongoing income and wealth accumulation, this specifically concerns the initial deposit at incorporation.

If you do not have a file with a substantiated answer to this question, do not fill in anything you cannot support. A bank statement from the founder, a loan agreement with a family member, or an investment agreement with a shareholder is the type of document the bank expects here. If that document is missing, then "no, not yet available" with an explanation is better than a guess. Note: this question is often linked to the question about the ultimate beneficial owners of the company — if the initial capital comes from a shareholder, the bank often also wants to know whether that person has already been registered as a UBO.

Where this follows from: Wwft client due diligence and the Trade Register Act

The bank's obligation to investigate the source of funds follows from the client due diligence under the Wwft, which requires banks to verify the source of deposited capital before a business relationship is entered into or continued. The basic information about the company itself — incorporation date, directors, capital structure — is established under the Trade Register Act 2007 and can serve as background information, but does not replace the specific proof of source that the bank is asking for here.