Yes. Earned income is the primary category of personal wealth today. It includes salaries and professional fees that result from labor and specialized tasks. Whatever of it is spent on personal and family expenses prior to the end of the zakat-year is not subject to zakat. But whatever is left of one’s earned income at the end of the zakat-year is subject to zakat— whether or not a full zakat-year has elapsed over the portion in hand. On the date the zakat falls due, whatever portion of the earned income is in hand, even if it is a check received that day, within the zakat-year, zakat must be paid on it if the total yearly salary and/or fees exceed the nisâb, the monetary equivalent of 3 US OZ. of pure gold. Salaries and fees received through the year are tabulated cumulatively.
Many modern Muslim jurists and scholars consider net earned income to be zakatable, including ‘Abd Al-Rahmân Hasan, Muhammad Abû Zahrâ, ‘Abd Al-Wahhâb Khallâf, Muhammad Al-Ghazali, Monzer Kahf, and Mahmûd Abû Sa’ûd (Kahf, The Calculation of Zakah, 5; Abû Sa’ûd. About the Fiqh of Zakât, 20).
The zakatable amount is the residual money left over from earnings at the end of one fiscal year. This does not mean zakat is due on the flow of income itself during the year. It is applied to whatever remains of one’s annual income at the end of the year (i.e., after taxes and expenses, and in all its forms and places of deposit collectively). (Fiqh az-Zakât, 310, 325)