Day Trading

There are clearly no legal issues for you. You can do whatever you'd like with your money. However, there may be some legal issues for him. "He takes a 25% commission" sounds like he takes 25% of the profits. In order for him to take an incentive fee like that, he would probably need to have a hedge fund structure. That is, he would have an investment vehicle that allows him to take your money.

If that's true, he would need to make sure that you are an accredited investor. That is, satisfying the following:

"a natural person who has individual net worth, or joint net worth with the person’s spouse, that exceeds $1 million at the time of the purchase;

a natural person with income exceeding $200,000 in each of the two most recent years or joint income with a spouse exceeding $300,000 for those years and a reasonable expectation of the same income level in the current year; or

a trust with assets in excess of $5 million, not formed to acquire the securities offered, whose purchases a sophisticated person makes."

If you don't satisfy that he would need to jump through some real hoops to be able to collect that incentive fee and not run afoul of the rules. Given these issues, I recommend that you spend some time talking to him as well as talking to an investment pro before you invest.

Good luck.