why does my bank want to know what I use the account for

Account purpose is part of customer due diligence

The bank does not ask this out of curiosity, but because customer due diligence requires it by law. As soon as the expected use deviates from what actually flows through the account — a different type of transactions, other countries, different amounts — the bank must notice this and sometimes conduct a new investigation. This is why the question comes up again, even with customers who have been banking for years: it is not a one-time intake but an ongoing obligation of the bank itself.

In practice, "account purpose" is usually combined with questions that go a little further: what is the origin of the company's assets, at which other banks the company maintains accounts, and sometimes whether transactions with specific countries are expected. A concrete answer — "purchase of raw materials from three fixed suppliers in Germany and Poland, sales to Dutch retailers" — gives the bank something to hold on to. A vague answer ("general business use") more often leads to a follow-up question, not because it is wrong, but because it offers nothing verifiable.

Basis: client due diligence under the Wwft

This question follows from the customer due diligence that institutions such as banks must perform under the Anti-Money Laundering and Counter-Terrorism Financing Act. This law requires the bank to, among other things, establish the purpose and nature of the business relationship, and to record and continue to monitor it. This is an obligation of the bank, not of the customer — the customer provides the information with which the bank can fulfil its own due diligence obligation. To distinguish: data such as directors and registered address are already established in the Trade Register under the Trade Register Act 2007; the purpose of the account is not listed there and the bank must therefore ask the customer directly. The same due diligence logic underlies questions about who are the ultimate beneficial owners of the company: this is also part of the same customer due diligence, not a separate process.