194C - TDS on contract payment

Suresh Kumar (student) (42 Points)

08 June 2017  
Our company didnot deduct TDS u/s 194C as we thought the aggregate amount of payment would not exceed Rs.1 lakh during 2016-17

but in march the aggregate amount of payment during the year 2016-17 exceeded Rs.1 lakh.

what is the solution to this. how do we deduct TDS and on what amount? interest payable? penalty?