SEO Sai Gr. Hosp.
210493 Points
Joined July 2016
Not mandatory to file NIL IT file, but usually advisable.
You can make estimate of your income from various sources from any financial year beginning April to end of March.
You should have PAN, and some knowlege to operate efilling site of Income tax.
It will be advisable to take help of any Tax Return Preparer, in the beginning.