Direct answer
Trading forex for someone else can be legal in some situations, but it is not automatically legal. The outcome depends on the legal relationship between the parties (for example, whether you have authority to act for them), how the trading is carried out (who presses the “buy/sell” actions), and the requirements of the relevant jurisdiction and any broker or platform terms.
Because forex regulation varies by country, there is no single universal rule. The safest general way to think about it is: legality usually hinges on permission and proper role—whether you act with the other person’s consent and within the boundaries of applicable regulation.
How the “for someone else” part works
When people say they want someone else to trade forex “for them,” a few different arrangements are possible:
- You act on their behalf (agency). In this case, the other person remains the customer, and you are authorized to manage the account or place trades under that authorization.
- You provide signals or advice. In this model, you do not place trades, but you influence decisions. Some jurisdictions treat this differently from direct trading authority.
- You trade using their account credentials without authorization. This is often treated as unauthorized access or a misuse of account access, which can lead to legal and contractual consequences.
Even when an arrangement seems informal, legal analysis still centers on consent, scope of authority, and who is actually executing orders.
Independent checks and common limitations
To assess legality in a verifiable way, check these items (without relying on a general assumption):
- Authority and consent: Can you demonstrate explicit permission to place trades or manage the account, and is the scope of that permission clear?
- Trading method: Are orders executed through the account holder’s approved access, or are you executing trades without valid authorization?
- Regulatory status: Do your actions resemble activities that local rules regulate (for example, managing or executing trades for others)?
- Platform and contract terms: Do the broker/platform terms allow third-party trading or account delegation?
- Documentation: Is there written agreement that reflects what you will do and what you will not do?
Limitations to keep in mind: even if someone agrees, legality can still depend on how the activity is classified by local law and the broker’s requirements. Also, if you lack permission, the risk is higher because consent may be missing or the arrangement may exceed the granted authority.
Key uncertainties and what not to assume
This is a general educational overview, not legal advice. Since no current country-specific rules are evaluated here, the reader should treat “legal” as conditional, not guaranteed. Also, legality does not automatically mean the arrangement is safe, fair, or dispute-proof; permission and accurate documentation are central.
If you want a clearer answer for a specific situation, you would need to compare (a) the country involved, (b) the exact arrangement (authority vs. advice vs. unauthorized access), and (c) the broker or platform’s permitted use of third parties—using official or primary sources.