the Fatwa Department Research Committee - chaired by Sheikh `Abd al-Wahhâb al-Turayrî
You do not pay Zakâh from your wages. You pay it from your monetary savings (gold, silver, and currency) that you have retained in your possession for one full year. You must calculate the amount of money that you have had in your possession for one full year. Then, if you find that it reaches the minimum amount of money for which Zakâh is required, you must take from it 1/40th (2.5%) and give it to the poor, the destitute and others like them.
The minimum amount of savings for which Zakâh is due is the monetary value of 595 grams of pure silver. You should determine the exact value in your currency before paying. If your savings that you have retained for a full year are less than this amount, you do not have to pay Zakâh.
You pay Zakâh on livestock, certain types of produce, trade merchandise, and properties that are used to generate income (like rental properties). You do not pay Zakâh on personal property like your home, car, or clothing.
And Allah knows best.
Source: Islam Today