Solo 401k vs SEP-IRA: Which Is Better for a Self-Employed Person, and How Much Can You Actually Contribute?
A self-employed person with $80,000 in net income can contribute roughly $38,000 to a Solo 401k but only about $16,000 to a SEP-IRA — on the same income. Most people pick the SEP because it’s simpler without realizing they’re leaving more than $20,000 in annual tax-deferred contribution room on the table. Here’s the complete comparison: contribution limits at different income levels, the Roth advantage the SEP-IRA doesn’t have, the backdoor Roth complication that makes the SEP a trap for some investors, and a clear decision framework for choosing the right account.










