Markets & Investing
Solopreneur SEP IRA vs Solo 401(k): 2026 Strategy Guide
Navigating the highest contribution limits and tax advantages for the modern six-figure freelancer.
5 min read
retirement planning
Everything we've published on retirement planning — 3 articles.
What to know
- A Solo 401(k) allows for significantly higher total contributions than a SEP IRA at the $100,000 profit level.
- SEP IRAs offer the lowest administrative burden with no annual IRS filing requirements.
- Solo 401(k)s provide superior flexibility through Roth options and participant loan provisions of up to $50,000.
- For 2026, the elective deferral for Solo 401(k) plans is expected to increase with inflation, further widening the gap over SEP IRAs.
- A 3.3% to 3.5% withdrawal rate is historically safer than 4% for retirement horizons exceeding 40 years.
- Variable business revenue acts as a powerful hedge against sequence of returns risk by reducing the need to sell assets in down markets.
Entrepreneurship
The 4% Rule Stress-Test for Early-Retiree Solopreneurs Under 40
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Personal Finance
Why DINK Couples Earning $300k Should Prioritize HSAs
For high-earning households, the triple-tax advantage of a health savings account often outweighs the benefits of a 401(k) catch-up.
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Questions readers ask
- What is the main difference between a SEP IRA and a Solo 401(k)?
- The main difference is that a SEP IRA is funded solely by employer contributions (up to 25% of compensation), while a Solo 401(k) allows for both employee elective deferrals and employer contributions, leading to higher limits.
- How much can I contribute to a Solo 401(k) with $100k profit in 2026?
- With $100,000 in net profit, you can likely contribute approximately $42,000 to a Solo 401(k) (combining elective deferrals and employer portions), compared to about $18,600 for a SEP IRA.
- Do I need to file special tax forms for a SEP IRA?
- No, a SEP IRA does not require annual informational filings like the Form 5500-EZ, making it the more administratively simple choice for busy freelancers.
- Is the 4% Rule safe for a 50-year retirement?
- While the 4% Rule was designed for 30 years, researchers suggest a lower rate of 3.3-3.5% is more appropriate for a 50-year horizon to account for increased longevity and inflation risks.
- How does variable revenue affect FIRE calculations?
- Supplemental income reduces the 'portfolio withdrawal' requirement, allowing your assets to remain invested during market downturns and significantly increasing your probability of success.
- What is the best withdrawal strategy for solopreneurs?
- A dynamic strategy like Guyton-Klinger Guardrails is best, as it allows for higher spending in bull markets and requires small cuts in bear markets, which fits the flexible nature of solopreneurship.
- Why is an HSA better than a 401(k) for high earners?
- An HSA is superior because it avoids FICA taxes when funded via payroll and offers tax-free withdrawals for medical expenses, whereas 401(k) withdrawals are taxed as ordinary income.
- Can I use HSA money for non-medical expenses?
- Yes, after age 65, you can withdraw HSA funds for any reason without penalty, though you will pay ordinary income tax on non-medical withdrawals, identical to a traditional 401(k).