You can have both a SEP IRA and a Solo 401k plan and contribute to both plans. This is confirmed in IRS Publication 560, Chapter 2, page 6 “More than one plan”. However, the combined contribution for both plans (the SEP IRA and Solo 401k) may not exceed the annual contribution limit for the year: For 2022 - $61,000, or 25% of compensation from the business, whichever is less.
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