Freelancer Retirement Plans: SEP-IRA vs Solo 401(k)

By Maya Ellison · Updated 2026-10-06

The best retirement plan for a freelancer in 2026 is a Solo 401(k) once net profit passes roughly $60,000, and a Roth IRA plus a SEP-IRA below that. The 2026 ceilings are $24,500 for employee deferrals, $72,000 for total contributions to a Solo 401(k) or SEP-IRA, and $7,500 for an IRA — the figures the IRS published in IR-2025-111. Nobody matches you and nobody auto-enrolls you, so every dollar has to be moved on purpose. Below: which plan fits your income, the arithmetic that decides how much you can really put in, the deadlines that catch people out, and a worked example on a real number.

No employer, no problem — but no auto-enrollment either

Freelancers have access to retirement accounts that are arguably better than typical 401(k)s — if they fund them deliberately. The 2026 landscape:

• SEP-IRA: contribute up to 25% of net self-employment earnings, capped at $72,000 for 2026 on compensation up to $360,000 (IRS COLA table). Easy setup, no annual filings, and — the useful part — you can still open and fund it up to your tax filing deadline, including extensions (IRS SEP FAQ). Employer-side only: no employee deferral.
• Solo 401(k): an employee deferral of $24,500 (plus $8,000 at 50 and over, or $11,250 at ages 60–63) plus an employer profit share of up to 25% of net earnings, with total annual additions capped at $72,000 before catch-up contributions (IRS 401(k) limits). Best plan above roughly $60,000 net profit; many plans allow designated Roth deferrals and loans.
• Traditional/Roth IRA: $7,500 for 2026, or $8,600 if you are 50 or older, shared across all your traditional and Roth IRAs. Max this floor first if your income allows — it needs no plan documents and takes ten minutes.

Note the IRS computation: the effective SEP (and profit-share) limit is roughly 20% of net self-employment income after deducting the deductible half of self-employment tax, not literally 25%. The 25% figure is what the rules say about compensation; the self-employed computation reduces that base first.

2026 limits at a glance

Rules of thumb: under about $60,000 of profit, a Roth IRA plus a SEP is simplest — fewest moving parts and no year-end scramble. Above about $100,000, the Solo 401(k) lets you stack the deferral on top of the profit share and shelter far more. In between, the Solo 401(k) usually still wins because the $24,500 deferral does not come out of the 20% employer bucket; it sits alongside it.

SEP vs Solo: employees, spouse, Roth, and eligibility

Worked example: a $120,000 year in a Solo 401(k)

A consultant nets $120,000 after business expenses in 2026, is 44 years old, and has no employees.

1. Self-employment tax first: $120,000 × 92.35% = $110,820 of net earnings, then $110,820 × 15.3% = $16,955 of SE tax.
2. Deduct half of it: $16,955 ÷ 2 = $8,478. That reduces earned income for the plan calculation to $120,000 − $8,478 = $111,522.
3. Employer profit share: $111,522 × 20% = $22,304.
4. Employee deferral: $24,500, added on top of the profit share rather than subtracted from it.
5. Total for the year: $22,304 + $24,500 = $46,804 — comfortably inside the $72,000 cap.
6. Same income in a SEP-IRA: $22,304. The deferral is the entire difference: $46,804 − $22,304 = $24,500.

Formula: Solo 401(k) total = employee deferral + 20% × (net profit − half of self-employment tax).

If all $46,804 lands at a 22% marginal federal rate, it defers roughly $10,300 of federal income tax ($46,804 × 0.22 = $10,297), plus whatever your state charges. It does not reduce self-employment tax — nothing does except a smaller net profit — so keep funding your tax set-aside percentage on the pre-contribution number. Run your own figures through the solo 401(k) calculator or the step-by-step contribution guide.

Roth vs traditional for freelancers

Freelance income is volatile, which makes the choice year-by-year rather than permanent: in low-income years, go Roth and pay tax at a genuinely low bracket; in high years, use traditional deferrals to drop a bracket. A Solo 401(k) that lets you split between pre-tax and designated Roth deferrals is the most flexible tool available to you, precisely because it does not force a single answer for every year of your career. One wrinkle to check before you plan around catch-ups: from 2026, catch-up contributions must be made on a Roth basis by participants whose prior-year Social Security wages with the plan sponsor exceeded $150,000 (IRS catch-up rules). For a one-person business that threshold is rarely hit, but it matters if you also have W-2 wages elsewhere.

Deadlines that actually bite

Two different clocks run on a Solo 401(k), and mixing them up is the expensive mistake. The employee deferral is a decision you make during the tax year — the plan has to exist and the election has to be on file before year end, so treat December 31 as hard. The employer profit share is flexible: it is computed from your final net profit, so it can wait until you file, extensions included (IRS one-participant 401(k) plans). A SEP has only the flexible clock — you can set it up and fund it as late as your filing deadline, extensions included, which makes it the right answer when a strong December tells you that you should have contributed more.

Two smaller dates matter too: IRA contributions for a given tax year must be in by your filing deadline without extensions, and a one-participant 401(k) with $250,000 or more in assets at year end must file Form 5500-EZ — a short form, but one you do not want to discover late.

Automate it like payroll

Treat retirement as a fixed cost, not a leftover. On the day each invoice payment lands, sweep a fixed percentage — 10–20% is a workable band for most freelancers — into a separate savings account, then fund the plan quarterly alongside your quarterly estimated taxes instead of trying to find a lump sum in April. Price the percentage into your rates with the rate calculator: if 12% of revenue is retirement, that is 12% on top of your cost base before you quote anything. In a strong year the balance sitting in that account becomes a profit-share contribution in March; in a weak year it becomes a smaller contribution and no crisis, because the money was never spent.

What this does not do

A retirement contribution reduces taxable income; it does not reduce net profit for self-employment tax, and it does not replace a tax reserve. It also does not fix an underfunded year — contributions are discretionary, so skip them when cash flow is tight and make them up later. None of this is financial advice: plan rules, contribution formulas and income phase-outs all have details that depend on your filing status and your other income, and a qualified planner or preparer should sign off before you move six figures on my arithmetic alone.