What is the zakah on a salary if the amount saved from it varies and one does not know the exact amount saved each month?

The questioner:
An employee saves a varying amount of money from his salary each month; the savings may be less in one month and more in another. Some of it has been in his possession for a full lunar year, while some has not. He does not know the exact amount he saved in each month. How should he pay its zakah?

The Shaykh:
The best and most cautious course for someone in this situation is to designate a specific month of the year in which he pays the zakah on what has accumulated with him, whether it has reached the lunar year or not, up to that month in the following year. This is what accommodates people, achieves the intended purpose, and removes the difficulty, if Allah wills. Yes.

The presenter:
If he intends to do this in Ramadan, he seeks the virtue in the timing.

The Shaykh:
There is no harm in that, but it is known that zakah must be paid out immediately. So when it becomes obligatory, it must be paid, and one should hasten to pay it out, unless the month of Ramadan is near and the delay is slight, in which case there is no harm. But a long delay deprives the poor of their right. Yes.

The questioner:
I mean, as long as the view, as you see, is to designate a month of the year for this employee in which the zakah is paid, if he makes it Ramadan to seek the virtue, he is correct in this, or are the months all the same?

The Shaykh:
The months are all the same, but if he makes it Ramadan to seek the virtue, there is no harm. Yes.