Islamic Banking, Miscellaneous Points Regarding Banks, Part 2 Some banks and companies which issue credit cards would charge extra interest or late fees if the credit card owners failed to pay their debts on time. Since paying late fees and interest is prohibited, the credit card owners must pay their debt on time, otherwise they have committed a sin. It is permissible to open saving accounts in Islamic banks with the purpose of winning prizes. This is also permissible to do in non-Islamic banks as long as they do not belong to the enemy countries. It is permissible for Muslims to invest in businesses that are run by non-Muslims on the condition that their investment is not used in unlawful or illegal transactions. It is impermissible to lie in order to pay lower taxes, draw up fictitious contracts in which lower wages have been accepted, and in general it is impermissible to lie to non-Islamic governments in order to get higher wages or more benefits.