Requirements
To open and contribute to a solo 401(k), you must meet two criteria:
- You have self-employment income
- Your business has no employees other than you and your spouse
Contribution limits in a one-participant 401(k) plan
The business owner wears two hats in a 401(k) plan; EMPLOYEE and EMPLOYER. Contributions can be made to the plan in both capacities. The owner can contribute both.
Contribution Limits for 2025
- 25% of compensation as defined by the plan can be company contribution
- $23,500 maximum salary deferral
- (if 50 to 59 (or 64+) years and above, additional $7,500)
- (if 60 to 63 years, additional $11,250)
- $70,000 (additional $7,500, if eligible)
Roth or Pre-Tax
- Salary deferral can be Roth or Pre-Tax
- Company contribution will be Pre-Tax
- Add in-plan Roth conversions to convert Pre-Tax dollars to Roth dollars
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