Is there a specific percentage of one's salary that an employee should donate as charity, and if not, what is the recommended amount?

Zakat is obligatory on wealth (gold, silver, money) if it reaches the nisab (the equivalent of 85 grams of gold or 595 grams of silver) and a hawl (a full lunar year) has passed on it. Its amount is a quarter of a tenth (2.5%). If Zakat is not obligatory, there is no specific percentage to donate from one's salary, but it is commendable for a Muslim not to deprive themselves of the virtue of charity (sadaqa). Many sacred texts have been revealed regarding the virtue of charity and spending in the way of Allah, including His saying, the Almighty: "The example of those who spend their wealth in the way of Allah is like a seed [of grain] which grows seven spikes" (Al-Baqarah/261), and the saying of the Prophet, peace and blessings be upon him: "Whoever gives charity equal to a date from good earnings... Allah nurtures it for its owner until it becomes like a mountain." One of the gates of Paradise is the gate of charity. The best charity is that given when one is well-off, and one should begin with those they are responsible for. Secret charity is preferred, and it is commendable to increase it during times of need, such as Ramadan, and to give to relatives and those in dire need.