Is Zakat obligatory upon a resident employee in Germany, who is married, pays various taxes and insurances, and helps his family in his home country, while not owning any agricultural land, livestock, or trade?

Zakat (definition) is not obligatory on the monthly salary immediately upon its receipt, based on the statement of Ibn Umar (may Allah be pleased with him): "Whoever acquires wealth, there is no zakat on it until a year has passed over it." This is the madhab of the four imams. If the saved wealth from it reaches the nisab (definition), either by itself or when combined with other wealth of the same type, then a new year (hawl) begins for it, and zakat is paid after a full year has passed over it, based on the Prophet's (peace be upon him) saying: "There is no zakat on wealth until a year has passed over it." If the wealth decreases during the year, the hawl is interrupted, and a new hawl begins if it reaches the nisab again.