¹[50A. Any person responsible for paying any amount on account of discount on the real value of Bangladesh Bank bills shall, at the time of making such payment, deduct tax at the maximum rate on the amount so payable or the rate applicable to such amount, whichever is greater ²[: Provided that no tax shall be deducted under this section where the said bill is purchased by an approved superannuation fund or pension fund or gratuity fund or a recognised provident fund, or a workers' profit participation fund.]]