Cash back awards
    for users of credit cards
Question

                In reference to Question 3402: Some Credit
      Card companies give you bonus or cash back award on the usage of the credit card, is the
      cash back award 'halaal' or is it 'riba'? Also, if one buys fix Certificates -- the
      capital is used by the government in business and projects -- and get a fixed profit of a
      certain percent, e.g., let say 6%, then is this profit comes under the category of 'Riba'?
      Please explain these two questions in the light of Qur'an and Sunnah. Jazaak-Allaah-Khair!
Praise be to Allah.Firstly: dealing with interest-based banks is not
    permissible except in cases of necessity, because it is a kind of cooperation in sin and
    transgression. Their giving awards to encourage people to deal with them is a kind of
    encouraging people to do haraam things and comes under the rulings on such things. Allaah
    says (interpretation of the meaning):
 Help you one another in Al-Birr and Al-Taqwa (virtue,
    righteousness and piety), but do not help one another in sin and transgression
    [al-Maaidah 5:2]
Secondly: guaranteed profits are not permissible, because the basic
    principle in shareeah is that .... and that one accepts that if there is the
    chance of making a profit, there is also the chance of losing. If the government borrows
    money from the people and gives them a fixed profit, these are interest-based bonds which
    are forbidden, and it is not permissible to deal with them at all. And Allaah knows best.