Can I have both a SEP IRA and a Solo 401(k)?
Yes, in some situations you can contribute to both a SEP IRA and a Solo 401(k) in the same year. The real question is whether that actually improves the outcome once you account for eligibility, contribution coordination, and extra admin. For many owner-only freelancers, one well-run one-participant 401(k) already gets them where they want to go without adding a second plan to manage.
