Tds u/s 194j

This query is : Resolved

N D B (Querist)
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07 September 2015 Hello Experts,

M/s X ltd, Proprietorship wants to deduct TDS of M/s Y, partnership firm. Followings are the bills issued by firm to m.s X ltd for professional fees;

1) 24 April 2015 : 4200
2) 10 July 2015 : 3000
3) 28 Aug 2015 : 1500
______
total : 8700

Still the aggregate limit of Professional fees i.e. 30000/- has not been exceeds. but m/s X wants deduct tds in Sep 2015 as there are certain chances to exceeds the limit during the year.

will it attract late payment of TDS interest as aggregate limit has not yet exceeds ?
if yes, then Can you please guide me Interest on TDS should be deducted @ which rate ? from when It should be calculated ?
please specify the section number in your answer ?