Now that we know he is obviously getting scammed, just for the sake of it, did the person in question somehow get into contact with somebody (most likely female) on some social website and she advised him how much money she made, got him to deposit, he made a fortune with great returns and when he wanted to cashout suddenly he needs to pay some sort of taxes before getting his money?

Even if it's a different scenario, you could open another topic, or at least update the title of this one with the words "scam" or anything else in it, it would help others who would google for this!