2. Solo 401(k)
Best for: A business owner or self-employed person with no employees (except a spouse, if applicable).
Contribution limit: For 2024, it's $69,000, plus a $7,500 catch-up contribution or 100% of earned income, whichever is less.
To help understand the contribution limits here, it helps to pretend you’re two people:
An employer (of yourself) and an employee (also of yourself).
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Tax advantage: This plan works just like a standard, employer-offered 401(k): You make contributions pretax, and distributions after age 59½ are taxed.
Employee element: You can’t contribute to a solo 401(k) if you have employees. But you can hire your spouse so they can also contribute to the plan. Your spouse can contribute up to the standard employee 401(k) contribution limit, plus you can add in the employer contributions, for up to a total of $69,000 in 2024, plus catch-up contribution, if eligible. This potentially doubles what you can save as a couple.
3. SEP IRA
Best for: Self-employed people or small-business owners with no or few employees.
Contribution limit: The lesser of $66,000 in 2023, $69,000 in 2024, or up to 25% of compensation or net self-employment earnings, with a $330,000 limit on compensation ($345,000 in 2024) that can be used to factor the contribution.