Is my zakah calculation of 2.5% on total amount correct?

Please clarify if I am right/wrong in calculating my zakah. I simply calculate approximately my zakah 2.5% on the total amount (balance in bank+ current value of the investments in stocks/mutual funds + provident fund balance) currently at the month of Ramadan regularly. I had read a Hadith in which the Prophet Muhammad PBUH had said that the excess zakah paid is just like that no zakah was paid.

Answer:

(Fatwa: 149/125/B=1433)

We could not find any such hadith. It is right to pay 2.5% as zakah.

Allah (Subhana Wa Ta’ala) knows Best

Darul Ifta,
Darul Uloom Deoband

This answer was collected from the official ifta website of Darul Uloom Deoband in India.

Link