Investing a Friend’s Money Without Permission: Is It Permissible If You Guarantee No Loss?
Question
Hypothetically, let’s say I had invested a certain amount of money (ex $2000)
And for whatever reason, a friend of mine asks if I can hold on to or manage a large sum of money (ex $20,000)
He did not explicitly tell me to invest it, rather to simply hold on to it.
If I invest that money myself, BUT I put a stop loss such that the losses would not exceed $2,000, would this be permissible?
If I lose money from his account, I would take out of my account to compensate him. He would always receive his $20,000 back.
Answer
Alhamdulillah, wassalatu wassalamu ala rasulillah, wa ala alihi wa sahbihi ajmain.
1. The Shari Context
When someone entrusts you with money to hold, this is known as an amanah (trust). The default ruling is that you must safeguard it exactly according to the owner’s instruction.
Allah says:
“Indeed, Allah commands you to render trusts to whom they are due.”
Surat al Nisa 4:58
The Prophet ﷺ also said:
“Render the trust to the one who entrusted you…”
Sunan al Tirmidhi
2. Scholarly Discussion
The scholars explain that when a person is given money as a trust:
- He is considered a trustee (amin)
- He is not allowed to use, invest, or dispose of it without explicit permission
- If he does so, he becomes liable (damin) for any loss
They distinguish between:
- Amanah (trust): no liability if used correctly
- Unauthorized use: transforms the role into liability
Even if the person intends good, or even if he plans to guarantee the capital, the issue is not only the outcome, but the initial violation of the trust.
3. Application to the Question
In your case:
- Your friend asked you to hold the money, not invest it
- This means your role is to safeguard, not to transact
So:
- It is not permissible for you to invest the money without his permission
- Even if you set a stop loss
- Even if you intend to cover any losses yourself
Because:
- You have acted beyond the permission given
- You have exposed the trust to risk without consent
However, if you clearly ask him and he agrees that:
- You may invest the money
- And he understands the risks
then it becomes permissible under an agreed structure.
4. Relevant Usul Principle
من تصرف في مال غيره بغير إذنه فهو ضامن
Whoever disposes of another person’s property without permission is liable.
This is also very suitable here. It directly addresses the act itself. Once he used the money in a way not authorized by the owner, he became damin, meaning financially responsible for any resulting loss.
التصرف في الامانة مقيد باذن المالك
Dealing with entrusted property is restricted by the permission of the owner.
This is another good formulation for explaining why simply “good intention” is not enough. The trustee cannot expand the scope of permission on his own.
In this case, when someone asks you to “hold” money, it is understood by custom that you will not use or risk it. This unstated understanding carries the weight of a condition, and violating it is not permitted.
Final Ruling
It is not permissible to invest your friend’s money without his explicit permission, even if you intend to guarantee his capital or limit losses. You must first obtain clear consent. Otherwise, you must simply hold and protect the money as an amanah.
And Allah knows best.