Finance
May 1, 2026

Solo 401(k) vs SEP IRA in 2026: Florida Self-Employed Plan

Solo 401(k) vs SEP IRA in 2026: Florida Self-Employed Plan
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Florida self-employed business owner planning retirement contributions for 2026 with calculator and documents
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If you are a Florida solopreneur, freelancer, contractor, or one-person LLC, the IRS just handed you the most generous self-employed retirement limits in U.S. history. For 2026, both the Solo 401(k) and the SEP IRA cap out at $72,000 — and if you are 50 or older, the Solo 401(k) lets you go all the way to $80,000. National Small Business Week runs May 3-9 this year, which makes early May the natural moment to lock in your plan before Q2 estimated taxes hit on June 15.

The trap most Florida self-employed fall into is assuming the two plans are interchangeable. They are not. Pick the wrong one and you can leave $20,000 to $40,000 of legal tax-deferred contributions on the table at the same income. Here is the playbook we walk our clients through.

The 30-Second Take

If you net less than roughly $280,000 from self-employment, the Solo 401(k) almost always wins because it lets you stack an employee-side deferral on top of the employer-side contribution. If you want Roth treatment or a participant loan, only the Solo 401(k) supports them. The SEP IRA wins on simplicity, on retroactive setup (you can still open one for last year up to your extended tax deadline), and when your spouse also draws income from the business and you want a one-size-fits-all employer formula.

2026 Contribution Limits — The Real Numbers

Both plans share the same $72,000 ceiling for 2026, but the road to that ceiling is completely different.

Solo 401(k) — Employee deferral — Up to $24,500 in 2026, contributable from the very first dollar of self-employment income. This is pre-tax or Roth, your choice.

Solo 401(k) — Employer profit-sharing — Up to 20% of net self-employment earnings (after the deductible half of SE tax), capped so the combined total does not exceed $72,000.

Solo 401(k) — Catch-up (age 50+) — Extra $8,000, lifting your personal cap to $80,000.

Solo 401(k) — Super catch-up (ages 60-63) — A higher $11,250 catch-up created by SECURE 2.0, available the year you turn 60 through the year you turn 63.

SEP IRA — Employer-only contribution, capped at the lesser of 25% of W-2 wages or roughly 20% of net self-employment earnings, up to the same $72,000 ceiling. No employee deferral. No catch-up. No Roth.

Net SE income required to hit the $72,000 cap (2026) Lower bar = you reach the max with less income Solo 401(k) ~$155,000 net SE income SEP IRA ~$280,000 net SE income $0 $140k $280k $420k Solo 401(k) reaches the cap on roughly half the income — the difference is the $24,500 employee deferral.
Same $72,000 ceiling, very different paths to get there.

How They Differ in Plain English

Here is the side-by-side a typical Florida sole proprietor or single-member LLC needs to see.

Feature Solo 401(k) SEP IRA
2026 max contribution (under 50) $72,000 $72,000
Catch-up (age 50+) +$8,000 → $80,000 None
Super catch-up (ages 60-63) +$11,250 None
Roth contribution option Yes (employee & employer) No
Participant loans allowed Yes — up to $50,000 or 50% of balance No
Plan setup deadline (for 2026) December 31, 2026 Tax filing deadline + extensions
Annual IRS Form 5500-EZ Required when assets exceed $250,000 Never required
Works if you hire W-2 employees Plan converts/closes once non-spouse W-2 employees Yes — but you must contribute the same % for them
Best for Most Florida solopreneurs & spouse-only shops High-six-figure earners who want zero admin

Why Florida Self-Employed Have an Edge

Florida has no state income tax, which changes the math two ways. First, every traditional pre-tax dollar you defer is deducted only against federal income tax and self-employment tax — there is no state piggyback the way Georgia or New York filers see. Second, that makes the Roth Solo 401(k) unusually attractive: you pay your federal tax now, never owe Florida state tax in retirement (because there is none), and lock in the current 22% or 24% federal brackets before they sunset.

Translation: a Florida-based freelancer in the 24% bracket who makes a $24,500 Roth Solo 401(k) deferral is effectively buying $24,500 of forever-tax-free growth for $5,880 of current federal tax — and zero state tax now or later. That is a deal you simply cannot replicate in 41 of the other 50 states.

Common Pitfalls We See Every Year

Waiting until tax-filing extension to open a Solo 401(k) — A SEP IRA can be set up retroactively up to your extended deadline. A Solo 401(k) cannot. The plan document must exist by December 31 of the year you want to make employee deferrals. Open it in March of the following year and you lose the entire $24,500 deferral bucket for the prior year.

Forgetting Form 5500-EZ once your balance crosses $250,000 — Easy to miss, and the late-filing penalty is $250 per day capped at $150,000. Calendar this the year your plan crosses the threshold.

Hiring a W-2 employee while running a Solo 401(k) — The plan loses its solo status the moment a non-spouse employee becomes eligible. You need to convert to a regular 401(k) or move to a SEP/SIMPLE before that hire.

Contributing more than 20% of net SE earnings — Self-employed contribution math is on net earnings after the deductible half of SE tax. The mental shortcut "I made $100k so I can put in $25k" is wrong. Run the actual formula or ask your accountant.

Your 2026 Retirement Plan Setup Checklist

1. Project your 2026 net self-employment income — Pull your 2025 Schedule C number and adjust for what you expect this year. This single number drives every decision below.

2. Choose Solo 401(k) if any of these apply — You expect under $280k of net SE income, you are 50+ and want catch-up room, you want Roth treatment, you may need access via a participant loan, or you just want maximum flexibility.

3. Choose SEP IRA if any of these apply — You earn well above $280k and just want simplicity, you missed the December 31, 2025 Solo 401(k) deadline and need a 2025 plan, or you have non-spouse W-2 employees and want a single contribution formula.

4. Open the plan before December 31, 2026 — Most major brokerages (Fidelity, Schwab, Vanguard, E*TRADE) offer free Solo 401(k) plan documents. SEP IRAs can be opened in 15 minutes online with no document fees.

5. Set up automated quarterly contributions — Pick four dates that align with your federal estimated tax deadlines (April 15, June 15, September 15, January 15) and automate the transfer. This kills the year-end scramble.

6. Coordinate with your Q2 estimated tax — Your June 15 estimated payment shrinks dollar-for-dollar with every traditional contribution you have already made. Account for this so you do not overpay the IRS.

7. Track the $250,000 threshold for Form 5500-EZ — Set a calendar reminder for the year your Solo 401(k) balance is on track to cross $250,000 so you do not miss the first filing.

The Bottom Line

For most Florida self-employed earning between $50,000 and $250,000 a year, the Solo 401(k) will out-shelter a SEP IRA by tens of thousands of dollars — and unlocks Roth treatment that pairs perfectly with Florida's no-state-tax environment. For the high six-figure earner who wants the simplest possible plan and no Form 5500 obligation, the SEP IRA still has its place. The wrong move is doing nothing: National Small Business Week is the IRS's annual nudge to lock this in, and every month you wait is a month of compounding growth you do not get back.

Not sure which plan fits your numbers, your entity structure, or your 2026 estimated tax plan? Schedule a 30-minute strategy call with Accounting BOSS and we will model both plans against your actual income, run the Roth-versus-traditional projection in our Florida-only no-state-tax framework, and have your plan opened and funded before the next quarterly deadline.