Solo 401(k) vs. SEP IRA: A Guide for Solopreneurs

← Back to All Insights Business Solo 401(k) vs. SEP IRA: A Guide for Solopreneurs April 14, 2026 By Bob Wolfe, CFP®, EA, CSLP® Business Benefits Listen to this article Speed 1x Have you been contemplating how to save for retirement as a solopreneur but feel overwhelmed by your choices? You’re not alone. For many self-employed individuals, navigating retirement plans like Solo 401(k)s and SEP IRAs can feel like an intimidating maze, but no worries, we’ve got you covered. This guide will break down the differences, pros, and cons of both plans, making it easier for you to choose the one that works best for your goals and business setup. Why Retirement Planning Matters for Solopreneurs Facing Retirement Alone Unlike employees who can rely on workplace-sponsored retirement plans like 401(k)s, solopreneurs don't have that safety net. This means your financial future rests solely in your hands. Without a solid retirement plan, you risk falling short on savings when you need them the most. Building Financial Freedom Planning ahead ensures you won’t have to alter your lifestyle drastically, or worse, delay retirement, just because you didn’t prepare. Having a reliable plan provides peace of mind and allows you to maintain the life you envision when work is behind you. Retirement Plan Options for Solopreneurs What is a Solo 401(k)? A Solo 401(k), sometimes referred to as an Individual 401(k), is a retirement plan designed specifically for business owners with no employees (other than a spouse). It allows you to make contributions both as an "employee" and as an "employer," maximizing your savings. Nerd Note: The Solo 401(k) offers some of the highest contribution limits among retirement plans for solopreneurs, up to $70,000 in 2025 (if you’re under 50). What is a SEP IRA? The SEP IRA (Simplified Employee Pension) is a straightforward option that’s popular with self-employed individuals and small business owners. With a SEP IRA, contributions are made by the employer only, based on a percentage of annual income. Nerd Note: One of the SEP IRA’s biggest perks is its simplicity. You can even set one up close to tax deadlines if you’re looking for end-of-year deductions. Solo 401(k) vs. SEP IRA – Pros and Cons Pros and Cons of Solo 401(k)s Pros: Higher contribution limits for high-income earners.Flexible tax benefits (choose pre-tax or Roth contributions).Doesn’t interfere with Backdoor Roth IRA contributions, which is a common wealth-building strategy. Cons: You can’t have employees (except a spouse).Requires filing Form 5500-EZ if your plan balance exceeds $250,000.Contributions must be "substantial and recurring", typically three out of five years. Pros and Cons of SEP IRAs Pros: Easier and faster to set up compared to a Solo 401(k).Allows flexible contribution amounts that can adjust based on your business performance.Contributions can extend to employees, making it a good option if you're planning to grow your team. Cons: Employees cannot make their own contributions to the plan.No catch-up contributions are available for individuals over 50.The uniform contribution rule means you must contribute the same percentage for all eligible employees, which can get pricey as your team expands. Choosing the Right Plan for Your Business When a Solo 401(k) Makes Sense You're self-employed with no employees (besides a spouse).You earn higher income and want to maximize your contributions.Backdoor Roth IRA eligibility is part of your retirement strategy. When a SEP IRA Fits the Bill Your income varies year to year, and flexibility in contributions is key.You plan to hire employees as your business grows.You’re looking for something quick and simple to set up. Nerd Note: While a SEP IRA is easier to establish, it could become expensive as your business and team grow, so keep future costs in mind. Breaking Down Contribution Limits Solo 401(k) Contributions Solo 401(k)s allow for contributions as both employee and employer, making it possible to contribute up to $70,000 (2025 limit for under 50) or $77,500 if you’re over 50 (with catch-up contributions). SEP IRA Contributions The SEP IRA limits contributions to 25% of net self-employment income, with a maximum limit of $70,000. High income is required to hit the upper thresholds. Common Mistakes to Avoid Solo 401(k) Mistakes Forgetting to file Form 5500-EZ once your plan exceeds $250,000 in assets.Not maintaining consistent contributions, which could risk plan termination. SEP IRA Mistakes Misunderstanding the uniform contribution requirement, which applies to all eligible employees.Assuming employees can make their own contributions (hint: they can’t). Nerd Note: If your needs change over time, you can roll a SEP IRA into a Solo 401(k) without losing your savings. Bringing It All Together Planning for retirement as a solopreneur involves weighing your current financial situation, tax strategy, and long-term business plans. While Solo 401(k)s offer flexibility and higher contribution potential, SEP IRAs shine in simplicity and employee inclusion. Whatever you decide, arming yourself with the right tools and knowledge will pave the way for a financially secure retirement. Need clarity or help setting up the perfect plan? At HealthyFP, we’re here to guide solopreneurs like you through every step of the process. Book your consultation today and take control of your future. 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