Does paying more than the amount required for zakaah mean that one is allowed to take interest?

Interest from the bank is haraam according to the consensus
of reliable scholars. Many statements have been issued to that effect by
many respectable academic bodies in the Muslim world, such as the statement
issued by the Islamic Research Council of al-Azhar in 1965 CE, which
included representatives and delegates from thirty-five Muslim states. In
this statement it says:  

“Interest on all kinds of loans is forbidden riba, regardless
of the type of loan, because the texts of the Qur’aan and Sunnah, when taken
together, definitively forbid all types.” 

A statement was also issued by the Islamic Fiqh Council
belonging to the Organization of the Islamic Conference, in 1985 CE, in
which it says: 

“Interest on loans in return for deferral of repayment when
the borrower is unable to pay them when they are due, and interest on loans
from the outset, are both forms of forbidden riba.” 

A similar statement was also issued by the Islamic Fiqh
Council belonging to the Muslim World League in 1986 CE, in which it said: 

“All wealth that comes by means of riba-based loans is wealth
that is haraam according to sharee’ah. It is not permissible for the Muslim
to make use of it, whether he deposited the money for himself or for anyone
of his dependents, for any of their affairs. He has to dispose of it by
giving it to charitable projects that will benefit the Muslims, such as
schools, hospitals, etc. This does not come under the heading of charity,
rather it comes under the heading of cleansing wealth of haraam elements.” 

It is not permissible under any circumstances to leave this
interest in the riba-based bank to increase. This sin is greater with regard
to banks abroad, because they usually support Christian and Jewish
interests, thus they use the wealth of the Muslims to further aggression
against the Muslims and mislead them from their religion. It should also be
noted that it is not permissible to continue to deal with these riba-based
banks, whether one deals directly in interest or not.  

See also questions no.
12823,

20695,

292,

22392. 

Hence we may understand that the confusion that some people
try to stir up as to whether interest is haraam or not is something to which
no attention should be paid. 

Interest is impure wealth from which zakaah and charity
cannot be given, whether that is zakaat al-fitr in Ramadaan or other kinds
of charity. What you have to do is to get rid of this money by donating it
to Muslim charitable causes, and also stop dealing with riba based banks as
much as you can. 

And Allaah knows best.