Can i file 2016-17and2017-18returns now?

Return cannot be filed now as the due date for filing return for FY 17-18 expired on 31.03.2019.

For FY 18-1*9 you can file ITR 3/4 depending on your situation.

But I have 1800rs TDS cut by SBI every year since 3 years. when I asked them they told that I need to file returns. I checked TDS recently only. That means I have to lose TDS? no refund possible for previous years?

In case of refund return can be file only after getting permission from concerned CIT.

Please read below circular:

https://incometaxindia.gov.in/communications/circular/circular9_2015.htm

So is there any online procedure to apply to get approval from CIT?