Disposing of the Orphans' Wealth and Its Zakah

Question:
This questioner says: I have orphan brothers, and I am their guardian. A sum of money has accumulated for them, amounting to approximately twenty thousand. I am unable to increase it for them; rather, it is stagnant because it exceeds their needs. However, I sometimes need it, so I take it and then return it after a year or two. Is there any sin on me for that? And is there zakah on it?

Answer:
It is obligatory for you to do what is most beneficial for their wealth, which is a trust in your possession and on your conscience. It is obligatory to hand it over to a trustworthy and honest person who can increase it, hoping that it will grow and increase. This is the obligation. Zakah is due on it, and you must pay the zakah from it: twenty-five out of every thousand each year. You are their guardian, so you pay the zakah. If you can increase it through trade, do so, and do not give it to someone who will not increase it through trade, nor let it sit idle.