Dear Akram
As per Sec 36(1)(iii) Interest on Borrowed Capital, Any amount of interest paid in respect of capital borrowed for acquisition of an asset for extension of existing business or profession for any period beginning from the date on which the capital was borrowed for acquisition of the asset till the date on which such asset was first put to use shall not be allowed as deduction.
So in your case nothing of the above category is attracted so the interest paid on ad-hoc limit of overdraft facility will be allowed as deduction as it's not within the purview of the above said section and it's also a normal business expendtiure and also comes under the purview of Sec 37(1) General Clause for Deductions.
Thanks & Regards
Amber Jain