any tax liability as the second user?

HI,

My brother, who is not a resident of USA, has added me as the second user of his account with IB. Since I am a resident of USA, I wonder if I have to assume any tax liability. i.e., do i need to report to IRS, or do i have to pay tax if there are gains in his account? many thanks.
 
Quote from zhexin2:

I am not co-owner of his account. I just have the trading access to his account.

Then you have no tax liability to the IRS, however, as a brother, you might consider his tax liability if you actually turn a profit trading his money.

**disclaimer: I am not a CPA!
 
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