Let me clarify. The financial institution (Etrade) gave me a cash bonus for opening my new Solo 401K account with them and put the cash bonus into my 401K account. I thought only earned income could go into a 401K account and I am wondering if they did that incorrectly and what the repercussion are with the IRS. Should it have gone into a brokerage account instead and taxed as interest income? Or does it remain in my Solo 401K to be invested to grow tax free?
