How is the zakah on a monthly salary calculated?

Question:
May Allah reward you. These questions have come in regarding the zakah on a monthly salary: how is it calculated?

Answer:
As for the monthly salary and income that recurs, the known rule is that there is no zakah on wealth until a lunar year has passed over it. This is the rule. However, since he wants to pay zakah every time a year has passed on an amount, and it is difficult for him to track these monthly incomes—tracking the lunar year for each amount is difficult for him—the best opinion, as our scholars have issued, is that he designates a month of the year, such as Ramadan, and then he pays zakah on what has accumulated with him, whether a year has passed on it or not, up to the same point in the following year.
He makes this month the season for paying the zakah on the wealth he has accumulated, whether a year has passed on it or not; because this is easier for him, and it also clears his conscience.