The person responsible for paying to any person any amount referredto in clause (a) of sub-section (2) of section 80CCA shall, at the time of payment thereof, deduct income-tax thereon at the rate of ten per cent :

Provided that no deduction shall be made under this section where the amount of such payment or, as the case may be, the aggregate amount of such payments to the payee during the financial year is less than two thousand five hundred rupees :

Provided further that nothing contained in this section shall apply to the payment of the said amount to the heirs of the assessee.