How is the Zakat on money calculated for a monthly salary of 1200 Euros, knowing that it is spent on food, drink, clothing, and rent?

Zakat (definition) is obligatory on your saved salary or other savings under two conditions: that it reaches the nisab (definition) (minimum threshold) – which is 85 grams of gold or 595 grams of silver – and that a full lunar year has passed on it. The amount of zakat is 2.5% for each year. It is obligatory to pay the zakat due for past years along with repentance. It is not permissible to agree to have your salary deposited in an interest-based bank except out of compulsion. In such a case, you must withdraw it immediately and dispose of the usurious interest by spending it on the welfare of Muslims.