The Tax is to be deducted at the time of provision as "
"Explanation lays down that even when an income is credited to any account inthe books of account of the person liable to pay income, such crediting shall be deemed to be credit of such income to the account of the payee and the provisions of tax deduction shall apply accordingly, but the fact that the credit to any account is deemed to be credit to the payee's account also presupposes that identity of the payee can be ascertained. Therfore, this deeming fiction can only be activated when the identity of the payee can be ascertained.. Therefore, the Explanationcannot be invoked in a case where the person cannot be identified a tthe stage at which the provision is to be made."
Now in your case, the person is clearly ascertainable, so the TDS is to be deducted, provided that the amount exceeds the threshold limit, i.e Rs.20000/- (Rs.30000/- w.e.f 01st July 10)