The procedure of filing an Income Tax Return (ITR) varies
as per the income earned per year and income sources like
salary, business profit, investment profit, and so on.
Collating all your documents ready is just one aspect of it.
There are certain documents required to be submitted and
held as evidence under the Income Tax Act, 1961 and
Income Tax Rules, 1962.
Generally, the required document is a copy of the PAN card,
a copy of the aadhar card, a bank statement / bank
passbook, Income Tax Login ID and password. Other than
that, it depends on which tax you are leviable to pay.