Can you clarify your question? You mention a 401(k) and a Roth IRA. Do you have a solo 401(k) or are you trying to set up a Roth IRA?
This link from the IRS provides general information on limits to assist you depending upon your specific situation. Also see Publication 560 from the IRS for more details on applicable compensation limits and deferral limits depending upon the type of retirement plan(s) you have in place.