As i understand correctly you want to know why is the company collecting your financial statement and what kind of background verification would they do with it.
Form 16 would give the correct info to the company on your current and previous salary.Also if you have mentioned you were making incentives then that should reflect in your form16.
and dont worry they will not go to the IT department to check if you have filed your taxes or not.
That is not the an employers job ,That's the governments job :)
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