tds related query

Bhagwat Singh (37 Points)

06 July 2019  
Good morning all,

I have a invoice of FY18-19. I just found that I hadn't dedected any tds against that invoice.

So my question is this
1. can we dedect tds in upcoming tds return and interest will be what?
2. if we don't dedect tds what we have to do who can we justify in income tax??