Tds to be deduct after limit exceed or before?..

If we deduct TDS after limit exceed, is there is any interest for delay of TDS payment.

Example: If April month paid Rs.10000/- professional fees to XYZ , but not deduct TDS (because limit does not exceed Rs.30000/-pa)

but June month paid Rs.40000/- professional fees to XYZ, in this month we deduct TDS @ 10% on entire amount of 50000/- (10000+40000)

In this case delay(??) in TDS deduction attract any interest or not?

Kindly give expert advice.

Thanks.