I’m Dutch. All of the requested data are legal to request as an employer in the Netherlands. Asking for an IBAN number (which is not considered “secret” btw) up front is a bit much though. You would only need that in case you are hired and they need too send the salary somewhere.

See list (in Dutch though) https://www.easypersoneel.nl/files/bewaarrichtlijnen-persone...

It is legal to request, but you would/should never do so as part of interviewing.

You really don’t want to know the candidates age, marital status or citizenship as part of an interview process. Once you do, you’re open to discrimination lawsuits for your hiring practises. Avoid asking questions that reveals information about stuff that is protected from discrimination.

https://www.government.nl/topics/discrimination/prohibition-...

Well, perhaps the IBAN is officially not considered secret, but it's still pretty sensitive - one bank had to disable a new feature in their app that allowed people who knew your phone number to obtain your IBAN: https://nos.nl/artikel/2268664-abn-schakelt-nieuwe-functie-t...

Hey. Also Dutch. Most of the things being asked are pretty normal to me (but it's more than I would expect a company to ask for...). I only find the IBAN weird to ask. Did you ask the company why they want your IBAN already? If it's a valid company, I'm pretty sure they're able to answer you.

No clue about NL specifically, but I would think a bunch of those should be illegal under GDPR?