Zakah on the commercial enterprises in different parts owned by one person

Q: I would like Your Eminence to issue me a Fatwa (legal opinion issued by a qualified Muslim scholar) regarding the following incident: Out of Allah's vast grace I own several commercial enterprises (commercial commodities) in different parts of the Kingdom of Saudi Arabia. The revenues and losses of these companies vary from one year to another as some realize profits while others lose. I do not know how to calculate the Zakah (obligatory charity) due on these companies.Is it Haram (prohibited) to add up the profits and subtract the losses of these companies and pay Zakah on the total sum? Or is it Wajib (obligatory) on me to keep these sums separate, in the sense that I should pay the Zakah due on each company funds separately? Please give me a Fatwa, may Allah reward you with the best reward. A: You should pay the Zakah on the total income of all your companies, i.e., you should add up their profits and pay 2.5% of the total upon the passage of a Hawl (one lunar year calculated from the time a property reaches the minimum amount upon which Zakah is due). You should also evaluate the commercial commodities in your possession (Part No. 8; Page No. 175

A: You should pay the Zakah on the total income of all your companies, i.e., you should add up their profits and pay 2.5% of the total upon the passage of a Hawl (one lunar year calculated from the time a property reaches the minimum amount upon which Zakah is due). You should also evaluate the commercial commodities in your possession (Part No. 8; Page No. 175) upon the completion of a Hawl since their purchase and pay Zakah of 2.5% of their estimated current value.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.