IT Filing F.Y 2016-17

Not in normal case, but yes if you have any refund claim.......   .......  .... .. u/s. 119(2)(b)

A belated return can be filed by the assessee anytime before the end of the relevant Assessment Year. The relevant AY in your case is 2017-18. Thus, You could file a belated return upto 31/03/2018. 

Accoringly, you will have to seek condonation of delay u/s 119(2)(b) and if the approptiate IT authority. The steps are as follows:

• Login to IT e-filing website.
• Click on e-file option and click on income tax return
• Select the AY and ITR name
• Select section 119(2)(b) as the reference section and file your returns
• File your return under section 139(4)