What is the ruling on Zakat for: 1. Income from usurped land? 2. Monthly salary? 3. Invested funds?

It includes all types of wealth. If it reaches the nisab (the equivalent of 85 grams of gold) and one year has passed since acquiring it, after deducting your expenses and the expenses of those you support, you pay its zakat at a rate of one-quarter of a tenth (2.5%), if the agricultural land is rented for money.

The amount you invest and receive profits from: You pay zakat on the profits along with the capital if it is a mudarabah (partnership) or a share in a trading company. However, if it is a share in an industrial company, zakat is due on the net profits of the share if it reaches the nisab and one year has passed.

If the intention of holding shares is for trading (buying and selling), then their zakat is like the zakat of trade goods, and it is paid on their value at the time zakat becomes due.