Zakah on money that was not paid for five years

Question:
He says: My brother traveled for five years and he had a large sum of money that he did not pay zakah on during these five years. Does he pay it all at once after he returned from his work and studies abroad?

Answer:
He pays it for every year. He collects the zakah due for the years on this money and pays it all out according to his ability. As for paying it only once, that is not sufficient except for money that you do not know whether it will return to you or not, such as money owed by a delinquent or an insolvent person, where you do not know if it will be returned or not. In that case, if you receive it, you pay zakah on it for one year. But money that is in your place, or in your box, or money that is waiting for you, you pay zakah on it for every year. However, you reduce the zakah of the first year from the second year, and you pay the rest, and so on. Yes.