Tax identification number (TIN or NIF)

Hello everyone,

I have a question regarding TIN.
I will be arriving in Brussels within a month, after obtaining all the needed permits. and now considering opening a bank account before arriving. However, all banks require a TIN, NN, or NIF number to do so.

This number does not appear to exists on the work permit or Annexe-46. Is it possible to get this number before registration at the town hall?

We actually opened an account with ING expat before having our numbers.  It was easy and we had it opened before we arrived.