Ruling on depositing money in the bank, and interest

Firstly: 

Depositing money in the bank in return for interest is riba
(usury), which is a major sin. Allaah says (interpretation of the meaning): 

“O you who believe! Be afraid of Allaah and give up what
remains (due to you) from Ribaa (from now onward) if you are (really)
believers.

279. And if you do not do it, then take a notice of war from
Allaah and His Messenger but if you repent, you shall have your capital
sums. Deal not unjustly (by asking more than your capital sums), and you
shall not be dealt with unjustly (by receiving less than your capital sums)”

[al-Baqarah 2:278-279] 

If a Muslim is forced to put his money in the
bank, because he cannot find any other means of keeping his money safe apart
from putting it in the bank, then there is no sin in that, in sha Allaah,
subject to two conditions: 

1-    
That he does not take any
interest in return

2-    
That the bank does not deal
only with interest, rather it should have some other activities that are
permissible in which it invests the money deposited. See questions no.
22392 and
49677 

It is not permissible to make use of the interest (riba)
which the banks pay to their customers. They must get rid of it by donating
it to charitable causes. 

The Scholars of the Standing Committee for Issuing Fatwas
said:  

The interest which the banks pay to depositors on the money
that they deposit in them is regarded as riba (usury). It is not permissible
to make use of this interest, and the customer must repent to Allaah from
depositing his money in riba-based banks. He should withdraw the money that
he deposited and the interest, keep the original amount and donate the extra
to charity, to the poor and needy or for renovating public facilities etc. 

Fataawa Islamiyyah, 2/404 

And Shaykh ‘Abd al-‘Azeez ibn Baaz (may
Allaah have mercy on him) said: 

With regard to the interest that the bank
gives to you, do not give it back to the bank and do not keep it, rather
spend it on charitable causes such as giving it to the poor, renovating
public washrooms, helping debtors who are unable to pay off their loans,
etc. 

Fataawa Islamiyyah, 2/407  

And Allaah knows best.