Last week, I went to CaixaBank to update my personal information. I thought it would be a simple matter of showing my NIE and signing a paper, but the clerk suddenly asked for my tax return from the previous year. I was stunned. I’ve been in Spain for years and this is the first time a bank has asked for this document! Before, the most they asked for was an updated NIE. Why is it like a tax audit now?
I didn’t have it with me, so the clerk said she’d process my request for now, but my file would be flagged as ‘missing documents’ and I’d need to submit it as soon as possible. She explained it’s to comply with new anti-money laundering regulations, as banks need to have a clearer understanding of their clients’ sources of funds. She mentioned that it’s not just CaixaBank; major banks like Santander and BBVA are also implementing this rule, and they’re being especially strict with foreigners.

When I got home, I immediately asked around in a few expat groups and found out that quite a few people have run into this recently! Some were asked for it when opening a new account, others when applying for a loan. Some people hadn’t even done anything but received a notification on their banking app asking them to upload their Renta, or their account functions would be temporarily restricted. It seems this is no longer an isolated incident but a widespread new policy. I feel like the banks are taking a ‘better safe than sorry’ approach now, and their screening process is much stricter than before.
What do you need to prepare?
To help everyone avoid being caught off guard like I was, I’ve compiled a list of documents banks typically request. Of course, requirements for things like proof of income might vary slightly from bank to bank, so it’s best to confirm with your account manager:
Common Document Checklist
| Document Type | Spanish Name | How to Obtain |
| Income Tax Return | Declaración de la Renta | Download from the Tax Agency (Agencia Tributaria) website or ask your Gestoría |
| Work Contract | Contrato de Trabajo | Request from your employer |
| Recent Payslips | Últimas Nóminas | Issued monthly by your employer |
| Work History Report | Vida Laboral | Apply on the Social Security (Seguridad Social) website |
For those who are not working, such as students, the situation can be more complicated. The bank might ask for proof of financial support from your parents, scholarship letters, or an explanation for the source of funds in your account. In short, the main goal is to prove your money is ‘clean.’ If you haven’t been filing a Renta, you should be very careful, as your bank statement certificate might be needed and you risk having your account frozen one day, which would be a huge problem. I strongly recommend everyone prepare digital copies of these documents just in case.
This whole incident was a wake-up call for me: tax compliance is becoming increasingly important for life in Spain. I used to think of banks as just a place to deposit and withdraw money, and that they couldn’t ask for that much, not even a proof of account ownership, but now it seems they’ve become the first line of defense for tax monitoring. Has anyone else been to the bank recently? Did you encounter a similar situation? Please share which bank it was and how you resolved it to give others a heads-up!