Self-Employed Retirement Plans 2026: Solo 401(k) vs. SEP-IRA vs. SIMPLE IRA
Freelancers and business owners can save far more for retirement than most W-2 employees — but only if they use the right plan. The Solo 401(k) can shelter up to $70,000 per year. The SEP-IRA sets itself up in 15 minutes. The SIMPLE IRA works once you have employees. Here's the complete comparison so you can choose and act.
Self-Employed Retirement: The Tax Shelter Most Freelancers Underuse
When you're self-employed, you have no employer matching your contributions and no HR department setting up a plan on your behalf. But you do have something W-2 employees don't: the ability to contribute as both the employee and the employer — which can shelter far more income from taxes than a standard workplace 401(k). The problem is that most freelancers either don't know these plans exist, or they don't set one up because it feels complicated.
It isn't. A SEP-IRA can be opened in the same day you file your taxes. A Solo 401(k) takes about an hour to set up. The contribution you make is fully deductible — meaning every dollar you put in reduces your self-employment income, lowering both your income tax and your self-employment tax bill. For someone in the 24% bracket paying SE tax, a $20,000 Solo 401(k) contribution can save $7,000+ in taxes in the year it's made.
📋 Which plans can you contribute to? You must have self-employment income — net profit from freelancing, consulting, sole proprietorship, single-member LLC, partnership, or S-corporation owner's W-2. You cannot use these plans for W-2 income from an employer (though you can use them alongside a W-2 job if you also have self-employed income). All three plans — Solo 401(k), SEP-IRA, and SIMPLE IRA — are funded with pre-tax dollars and reduce your taxable income in the year of contribution.
Solo 401(k), SEP-IRA & SIMPLE IRA — Quick Comparison
Before diving into the details, here's what each plan is optimized for in a single view. The right choice usually comes down to three things: how much you want to contribute, whether you have employees, and how much administrative complexity you're willing to manage.
Complete Comparison: Solo 401(k) vs. SEP-IRA vs. SIMPLE IRA (2026)
Every feature that matters for self-employed people and small business owners, in one table.
| Feature | Solo 401(k) | SEP-IRA | SIMPLE IRA |
|---|---|---|---|
| Who qualifies | Self-employed with no full-time employees (spouse can participate) | Any self-employed person or small business of any size | Businesses with 100 or fewer employees who earned ≥$5,000 in prior year |
| 2026 max contribution (under 50) | $70,000 | $69,000 | $16,500 employee + employer match |
| 2026 max contribution (age 50+) | $77,500 (+ $7,500 catch-up) | $69,000 (no catch-up) | $20,000 (+ $3,500 catch-up) |
| How contributions work | Employee deferral up to $23,000 plus employer profit-sharing up to 25% of W-2 / ~20% of net SE income | Employer-only: up to 25% of each participant's compensation (≈20% of net SE income for self-employed) | Employee: up to $16,500 salary deferral. Employer: either 3% matching or 2% non-elective for all eligible employees |
| Roth (after-tax) option? | ✓ Yes — Roth Solo 401(k) available at most brokers | ✗ No — pre-tax contributions only (can convert to Roth IRA separately) | ✗ No — pre-tax contributions only |
| Loans from the plan? | ✓ Yes — if plan document allows (up to 50% of balance or $50,000) | ✗ No | ✗ No |
| Employee coverage required? | No employees allowed (only owner ± spouse) | Yes — all eligible employees must receive the same % contribution | Yes — all eligible employees must be covered with mandatory employer contribution |
| Setup deadline | December 31 of the tax year (plan must be established by year-end) | Tax filing deadline including extensions (e.g., Oct 15 for sole proprietors) | October 1 of the year the plan is to be effective (90 days before year-end) |
| Contribution deadline | Employee deferral: Dec 31. Employer contribution: tax filing deadline + extensions | Tax filing deadline + extensions (same as setup — very flexible) | Employee deferrals: within 30 days of payroll. Employer: tax filing deadline + extensions |
| Administrative complexity | Moderate — plan document required; Form 5500-EZ when assets exceed $250,000 | Very low — no annual filings required; IRS Form 5305-SEP is the plan document | Moderate — annual employee notices required; IRS Form 5304-SIMPLE or 5305-SIMPLE |
| Cost to set up | Free at Fidelity, Vanguard, Schwab (no custodial fee) | Free at most major brokerages | Free to low cost; some financial institutions charge small annual fees |
| Investment options | Full brokerage — stocks, ETFs, mutual funds, bonds | Full IRA investment options — stocks, ETFs, mutual funds, bonds, REITs | Typically mutual funds; varies by financial institution |
| Early withdrawal penalty | 10% if under 59½ (same as traditional 401k) | 10% if under 59½ (same as traditional IRA) | 25% in first 2 years; 10% thereafter (if under 59½) |
| Required Minimum Distributions | Age 73 (SECURE 2.0); can delay if still working | Age 73 (same as traditional IRA) | Age 73 (same as traditional IRA after 2-year period ends) |
| Best for | Solo freelancers and owner-only businesses who want maximum contributions and Roth flexibility | Self-employed of any size who want simplicity; businesses with employees where contribution flexibility is needed | Small businesses with up to 100 employees that want a straightforward employer plan with lower admin burden than a full 401(k) |
Sources: IRS Rev. Proc. 2025-28 (2026 limits) · IRC §401(a) (Solo 401k) · IRC §408(k) (SEP-IRA) · IRC §408(p) (SIMPLE IRA) · IRS Publication 560 (Retirement Plans for Small Business). The Solo 401(k) employer contribution percentage for self-employed is approximately 20% of net SE income (after deducting the SE tax deduction and the plan contribution itself) due to the circular calculation — not 25%.
2026 Contribution Limits — What You Can Actually Put In
Understanding the contribution limits in the abstract is one thing. Seeing how much you can actually contribute at different income levels is more useful. The Solo 401(k)'s dual employee-employer structure makes it the clear winner at nearly every income level for solopreneurs.
| Net SE Income | Solo 401(k) Max | SEP-IRA Max (~20%) | SIMPLE IRA Max | Solo 401(k) Advantage |
|---|---|---|---|---|
| $20,000 | $23,000* | $4,000 | $19,100** | $19,000 more than SEP-IRA |
| $40,000 | $31,000 | $8,000 | $17,700** | $23,000 more than SEP-IRA |
| $80,000 | $39,000 | $16,000 | ~$18,900** | $23,000 more than SEP-IRA |
| $130,000 | $49,000 | $26,000 | ~$20,400** | $23,000 more than SEP-IRA |
| $230,000+ | $70,000 (max) | $46,000+ | ~$20,400** | $24,000+ more than SEP-IRA |
| $350,000+ (age 50+) | $77,500 (max + catch-up) | $69,000 (max) | $20,000 (with catch-up) | $8,500 more than SEP-IRA |
*Solo 401(k) at $20K income: employee deferral up to $23,000 can exceed net SE income — actual max is limited to net SE income after SE tax deduction. **SIMPLE IRA total assumes 3% employer match included. SEP-IRA percentage is approximate (~20% of net SE income after SE tax deduction adjustment). For exact calculations, consult IRS Publication 560 or a tax professional. All 2026 figures.
Maximum Annual Contribution by Income Level — Solo 401(k) vs. SEP-IRA vs. SIMPLE IRA (2026, Under 50)
Solo 401(k) = employee deferral + employer profit-sharing. SEP-IRA = ~20% of net SE income, capped at $69,000. SIMPLE IRA = $16,500 deferral + 3% employer match (employer match varies by income shown; capped at plan limit). Source: IRS Rev. Proc. 2025-28 · Plootus Research 2026.
⚠️ The SEP-IRA Catch-Up Gap: The SEP-IRA has no catch-up contribution provision — if you're 50 or older, you cannot contribute an extra dollar beyond the standard 25%/$69,000 limit. The Solo 401(k) allows a $7,500 catch-up on top of the $70,000 standard limit, and the SIMPLE IRA allows a $3,500 catch-up. For anyone 50+ trying to maximize retirement savings, this alone often tips the decision toward the Solo 401(k) or SIMPLE IRA.
Solo 401(k): The Best Plan for Most Solopreneurs
Also called the Individual 401(k), One-Participant 401(k), or Self-Employed 401(k), the Solo 401(k) is the gold standard for freelancers with no full-time employees. It offers the highest contribution limits, a Roth option, loan availability, and is free to set up at every major brokerage. The only real restriction is the employee prohibition — and the December 31 setup deadline.
How the Solo 401(k) Contribution Formula Works
You wear two hats: employee and employer. The employee portion and employer portion are subject to separate limits and deadlines:
| Contribution Type | 2026 Limit | Age 50+ Limit | Deadline | Notes |
|---|---|---|---|---|
| Employee deferral (pre-tax or Roth) | $23,000 | $30,500 | December 31 of tax year | Cannot exceed net SE income. If you also have a W-2 job with a 401(k), both plans share this one $23,000 employee deferral limit. |
| Employer profit-sharing | Up to 25% of W-2 (or ~20% net SE income) | Same limit — no extra | Tax filing deadline + extensions | Pre-tax only (no Roth employer contribution). Deductible on Schedule C or Form 1065. |
| Combined maximum (under 50) | $70,000 | — | — | 415(c) limit — both employee and employer contributions combined cannot exceed this. |
| Combined maximum (age 50+) | — | $77,500 | — | Includes $7,500 catch-up on the employee deferral portion only. |
💡 The W-2 + Solo 401(k) Coordination Rule: If you have a day job with a 401(k) and also freelance on the side, you can still open a Solo 401(k) for your freelance income — but both plans share the single $23,000 employee deferral limit across all plans. You can, however, make the employer profit-sharing contribution from your Solo 401(k) on top of whatever you deferred at your day job. This makes the Solo 401(k) still very valuable for side-hustlers in high-income years.
Where to Open a Solo 401(k)
The best Solo 401(k) providers for most freelancers are Fidelity (free, Roth option, no minimum balance), Charles Schwab (free, excellent index fund selection), and Vanguard (free for index fund investors, slightly more paperwork). All three allow Roth Solo 401(k) contributions and loan provisions. Avoid high-cost insurance company products that bundle a Solo 401(k) with annuity-style investments.
SEP-IRA: Maximum Simplicity, Still Excellent Limits
The Simplified Employee Pension IRA is exactly what it sounds like — the simplest possible retirement plan for the self-employed. There is no plan document to maintain, no annual IRS filings, and the contribution deadline aligns with your tax filing deadline (including extensions), giving you maximum flexibility to decide how much to contribute after the tax year ends.
SEP-IRA Contribution Formula for the Self-Employed
For a self-employed individual, the effective SEP-IRA contribution rate is approximately 20% of net self-employment income — not 25%, due to the circular calculation that adjusts for the self-employment tax deduction and the plan contribution itself. The exact formula from IRS Publication 560:
2. Subtract the deductible part of self-employment tax (Line 15 of Schedule 1)
3. This gives you "net earnings from self-employment"
4. Multiply by the contribution rate: for 25% plan rate → use 20% (= 25% ÷ 125%)
5. Cap at $69,000 for 2026
Example: $100,000 net profit → ~$92,935 net SE earnings → × 20% → $18,587 max SEP-IRA contribution
SEP-IRA and Employees
If you have employees, a SEP-IRA requires you to contribute the same percentage of compensation for every eligible employee that you contribute for yourself. This is the plan's biggest downside for businesses with staff: if you want to put in 20% of your own compensation, you must put in 20% of each eligible employee's compensation too. This makes SEP-IRAs less attractive as businesses grow and hire. An employee is eligible if they're at least 21 years old, have worked for you in at least 3 of the last 5 years, and earned at least $750 in 2026.
⚠️ SEP-IRA and the Backdoor Roth: A SEP-IRA balance is a pre-tax IRA and is subject to the pro-rata rule for Roth conversions. If you have a large SEP-IRA balance and also want to do a backdoor Roth IRA, the SEP-IRA balance will make most of your backdoor Roth conversion taxable. The solution is to roll the SEP-IRA into a Solo 401(k) or employer plan (which removes it from the pro-rata calculation) before executing the backdoor Roth. This is one of the most important reasons many high-income freelancers prefer the Solo 401(k) over the SEP-IRA.
SIMPLE IRA: The Right Choice Once You Have Employees
The Savings Incentive Match Plan for Employees IRA is designed for small businesses with up to 100 employees. It's not the right choice for a pure solopreneur — the Solo 401(k) wins there — but once you have even one or two employees, the SIMPLE IRA becomes the easiest employer plan to set up and maintain, with significantly less administrative burden than a full 401(k).
| SIMPLE IRA Rule | 2026 Details |
|---|---|
| Employee deferral limit | $16,500 (up from $16,000 in 2025) |
| Catch-up contribution (age 50–59 and 64+) | $3,500 additional (total $20,000) |
| SECURE 2.0 Enhanced catch-up (age 60–63) | $5,250 additional (total $21,750) — new for 2025+ |
| Employer contribution options | Option A: Match up to 3% of employee compensation (can reduce to 1% in 2 of any 5 years) · Option B: Non-elective 2% of compensation for all eligible employees regardless of deferral |
| Eligibility | Employees who earned ≥$5,000 in any prior 2 years and reasonably expected to earn ≥$5,000 in the current year |
| Setup deadline | October 1 of the year the plan takes effect (for new plans). Cannot establish a SIMPLE IRA mid-year after Oct 1. |
| Early withdrawal — 25% penalty (first 2 years) | Withdrawals within the first 2 years of plan participation are subject to a 25% penalty (not the usual 10%). After 2 years, the standard 10% early withdrawal penalty applies. |
| No other employer plan allowed | If you maintain a SIMPLE IRA, you cannot maintain any other employer-sponsored retirement plan (401k, SEP-IRA, profit-sharing plan) in the same year |
| Annual filing requirement | No Form 5500 required — must provide annual notice to employees each year before the election period (Nov 2–Dec 1 typically) |
⚠️ The 25% Early Withdrawal Penalty in the First 2 Years: The SIMPLE IRA's most dangerous feature for new plan participants. If you withdraw or roll over SIMPLE IRA funds to a non-SIMPLE IRA within 2 years of your first contribution to the plan, the early withdrawal penalty is 25% — not the usual 10%. After 2 years, you can roll SIMPLE IRA funds into a Traditional IRA or 401(k) penalty-free. Never take a distribution from a SIMPLE IRA in its first 2 years without understanding this rule.
How to Choose: A Decision Guide by Situation
Most self-employed people fit clearly into one of these profiles. Start here, then confirm with a CPA or financial advisor who understands self-employment taxation.
| Your Situation | Recommended Plan | Why |
|---|---|---|
| Solo freelancer, no employees, want maximum savings | Solo 401(k) | Highest possible contribution limit. Employee deferral + employer contribution. Roth option. Free to set up. |
| Solo freelancer, want simplicity above all, don't need Roth | SEP-IRA | Simplest plan to set up and maintain. Latest setup deadline (tax filing + extensions). No annual filings. Still allows up to $69,000. |
| Freelancer who also wants to do a backdoor Roth IRA | Solo 401(k) | SEP-IRA balance triggers pro-rata rule and makes backdoor Roth mostly taxable. Solo 401(k) is not an IRA — it doesn't affect the pro-rata calculation. |
| Self-employed age 50+, want to maximize catch-up contributions | Solo 401(k) | SEP-IRA has no catch-up. Solo 401(k) adds $7,500 catch-up, bringing the max to $77,500. |
| Small business with 1–10 employees | SIMPLE IRA | Simple to administer, mandatory employer contribution builds employee loyalty, far less paperwork than a full 401(k). Setup by Oct 1. |
| Small business with employees, want flexible employer contributions | SEP-IRA | Zero required employer contribution in a bad year (vs. SIMPLE IRA's mandatory match/non-elective). Can choose 0–25% annually. |
| High-income freelancer, income varies year-to-year | SEP-IRA or Solo 401(k) | SEP-IRA: flexible — contribute only in profitable years, set up after year-end. Solo 401(k): must be established by Dec 31, but employer contribution due at filing. SEP-IRA wins on flexibility; Solo 401(k) wins on limit. |
| Just starting out, income under $30,000 | SEP-IRA or Solo 401(k) | At low incomes, SEP-IRA limit (20%) is low anyway. Solo 401(k) allows full $23,000 employee deferral regardless of employer contribution capacity — major advantage at low incomes. |
| S-Corp owner paying yourself a W-2 salary | Solo 401(k) | S-Corp W-2 salary is "compensation" for 401(k) purposes. Employee deferral based on W-2; employer contribution up to 25% of W-2. SEP-IRA also works but Solo 401(k) typically allows higher contributions per dollar of compensation. |
Model Your Self-Employed Retirement Savings
Plootus helps you project your retirement balance across different plan types and contribution strategies — so you can see the long-term impact of your choices today.
How to Maximize Your Self-Employed Retirement Savings
- 📅
Open Your Solo 401(k) Before December 31 — Even If You Don't Fund It Yet
The plan must be established by December 31 of the tax year to make contributions for that year. The employee deferral portion must be elected before year-end. But the employer profit-sharing contribution can be made as late as your tax filing deadline (including extensions — up to October 15 for sole proprietors). If you're considering a Solo 401(k), open the account now, even if you're uncertain how much you'll contribute.
- 🧾
Contribute as the "Employee" First — It's the Highest-Leverage Dollar
The $23,000 employee deferral to your Solo 401(k) reduces your taxable income dollar-for-dollar and is not limited by your income percentage the way the employer contribution is. At $50,000 of net SE income, the employer contribution maxes out at ~$10,000 — but you can still contribute an additional $23,000 as the employee (up to your net income). Always maximize the employee deferral first, then add employer contributions on top.
- 🔄
Consider the Roth Solo 401(k) During Lower-Income Years
In years when your self-employment income is lower — startup years, sabbaticals, or transition periods — a Roth Solo 401(k) contribution can be especially valuable. You pay tax now at a lower rate, and future growth is completely tax-free. Unlike a Roth IRA, the Roth Solo 401(k) has no income limits. The employee deferral can be split between traditional (pre-tax) and Roth in any proportion — giving you tax diversification in retirement.
- 💡
Use the SEP-IRA as a Backup If You Miss the Solo 401(k) Deadline
Forgot to open a Solo 401(k) by December 31? You can still open and fund a SEP-IRA up to your tax filing deadline including extensions. A SEP-IRA contribution for the prior year can be made as late as October 15 if you filed for an extension. For tax professionals working through April, this flexibility makes the SEP-IRA a reliable safety net — you can decide the contribution amount after seeing your final net profit.
- 📊
File Form 5500-EZ Once Your Solo 401(k) Exceeds $250,000
Solo 401(k) plans with total assets exceeding $250,000 at year-end are required to file Form 5500-EZ with the IRS annually. Missing this filing carries a penalty of $250 per day, up to $150,000 — one of the most expensive administrative mistakes in retirement planning. Set a calendar reminder to check your balance every December. The filing itself is straightforward and many CPA firms handle it as an add-on to your tax return for $100–$300.
- 🔃
Roll Your SEP-IRA Into a Solo 401(k) to Clean Up the Pro-Rata Problem
If you have an existing SEP-IRA balance and want to start doing backdoor Roth IRA contributions, roll the SEP-IRA into your Solo 401(k) first. Solo 401(k) plans can accept rollovers from SEP-IRAs. Once the SEP-IRA is at $0, the pro-rata rule no longer affects your backdoor Roth conversions. This is a clean, tax-free move — it does not trigger any taxes or penalties and can be done at any time.
Self-Employed Retirement Plans FAQ
Sources
IRS Rev. Proc. 2025-28 (2026 contribution limits: Solo 401k $70,000/$77,500; SEP-IRA $69,000; SIMPLE IRA $16,500/$20,000) · IRS Publication 560 (Retirement Plans for Small Business, 2025 edition) · IRC §401(a) (401k qualification rules) · IRC §408(k) (SEP-IRA) · IRC §408(p) (SIMPLE IRA) · SECURE 2.0 Act (Roth SEP/SIMPLE; long-term part-time employee rules; enhanced catch-up contributions for ages 60–63) · IRS Form 5305-SEP (SEP-IRA plan document) · IRS Form 5304/5305-SIMPLE (SIMPLE IRA plan document) · IRS Form 5500-EZ instructions (Solo 401k annual reporting threshold) · BLS Employment Situation Summary 2024 (self-employed count)
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