It’s difficult to find clear guidance on this. What I could find so far:
In any case, the more details you submit, the more likely you are to receive a visa without delay even if there is some latitude in the evaluation of the requirement. So if possible at all, it would be best to submit your bank statements or tax fillings. If your financials look really bad and you had rather avoid disclosing that then make sure you have a letter from your boyfriend and as much documentation on his situation as possible.
Credit:stackoverflow.com‘