Is zakat obligatory on money traded, and at what stage of its circulation, and how much is the amount to be zakat on, noting that zakat is paid in Ramadan?

The answer to your question includes several matters related to Zakat, as follows:

1. The intention to save does not waive Zakat on Zakatable assets, such as precious metals and money. Zakat must be paid on them if they reach the nisab (minimum threshold) and a hawl (lunar year) has passed.

2. The amount you paid to the first brother is subject to Zakat, in addition to any profit generated from it, if any.

3. Jointly owned land intended for trade is subject to Zakat if a hawl passes on its value, and you pay Zakat on your share of it.

4. If the jointly owned building is for rent, there is no Zakat on the building itself at present, but Zakat is due on the collected rent. However, if it was built for sale, it is considered a trade commodity, and its value is subject to Zakat every year.

5. Debts owed to you by an able and acknowledging debtor are added to your Zakatable wealth. Debts you owe are deducted, unless you have other non-Zakatable and non-essential assets from which the debt can be paid.

6. If you do not know the exact amount of Zakat due, you should investigate and act based on what is most likely.

7. The time Zakat becomes obligatory is at the completion of the hawl with the nisab being met, and it is not permissible to delay it.

8. The nisab for current banknotes is approximately equivalent to 85 grams of gold or 595 grams of silver, and Zakat on them is 2.5% (one-quarter of a tenth).