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Canadian in Greece - Opening up Bank Account and asked for Tax forms in Canada?

More likely its for due diligence. However I would not give a bank your tax return unless your applying for credit products. Thats invasive as they are a private company and not the government.
 
@canadianplainview Are you trying to avoid CRS by opening an account in Greece? doh948""

If so then no chance. As Sols said they will report your account as both are CRS countries.
 
When a bank asks for your tax documentation it's because they had previous clients give them false tax IDs to try to bypass CRS reporting. Now banks are more careful and will ask for real documents proving your tax ID is real. Not all banks do this though, only the ones that had bad experiences and want to avoid trouble. So yes, if they asked, it's 100% for your tax ID so they can go the reporting by the book, and i wouldn't trust greek banks to store large sums of money, let alone bypass CRS.