Prohibition of selling bills of exchange to the bank
Question

                Some businessmen are owed money by their customers, so they go to the bank and sell the bill of exchange to them for an amount that is less than the amount specified in the bill of exchange. Then the bank collects the debt for itself when it becomes due. What is the ruling on this?.
Praise be to Allah.This transaction is one of the transactions 
    that are haraam, and it is a form of riba (usury, interest). 
Because selling a bill of exchange – for 
    example – which mentions a debt of one thousand riyals to be paid in one month’s time to the bank for nine hundred riyals to be paid immediately, 
    is riba. The scholars are unanimously agreed that this haraam transaction is both riba al-nasee’ah and riba al-fadl combined, because it involves 
    exchanging currency available immediately for currency of the same kind to be paid later, plus an extra amount. 
If currency is exchanged for currency of a 
    different kind, the physical exchange must be done in the same sitting where the agreement is made. If they are of the same kind, then they must 
    be equal in value and the physical exchange must be done in the same sitting where the agreement is made. This is not the case in this scenario; 
    so it involves riba al-fadl because the amounts exchanged are not equal and it also involves riba al-nasee’ah because there is no mutual exchange 
    in the same sitting. 
The Standing Committee was asked about that 
    and they replied: 

    Selling the bill of exchange to the bank in return for an amount of money and leaving the bank to collect the amount stated in the bill of 
    exchange from the purchaser of the product is haraam because it is riba. 
Fataawa al-Buyoo’, 
    p. 352 
The Fiqh Council issued the following 
    statement: 
Selling bills of exchange to the bank is not 
    permissible according to sharee’ah, because it amounts to riba. 
And Allaah knows best.