How does one calculate zakah on a commercial establishment that is difficult to inventory every year?

Question : He says: I have a commercial establishment that is difficult to inventory every year for the sake of zakah. Is it permissible for me to estimate it and pay the zakah at more than the value as a precaution, or not?

Answer : Yes, if a person has a store where it is difficult for him to count everything in it, he may estimate it. If he pays more than what he thinks is the actual amount, that is better. Know, my brother, know that zakah is not a burden, but it is a gain that purifies a person, increases him, grows his wealth, clears his conscience, and shades him on the Day of Resurrection, as came from the Prophet (peace and blessings be upon him) Do not be stingy with yourself, for Allah says: . Give the zakah, and if the amount is more, there is no harm.
The important thing is that it not be less, and the matter is the reality. That is to say, a person who has a large store with both small and large items finds it difficult to count everything. But if he estimates that the zakah is ten thousand or fifteen thousand, let him make it what? He estimates it as ten thousand or fifteen thousand, so he makes it what? Fifteen thousand. Because if that is the obligatory amount, he has cleared his conscience. And if it is not the obligatory amount, the excess is voluntary charity, and he is rewarded for it.