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SEP IRA vs Solo 401(k) for 1099 Workers 2026 — Which Saves More Tax?

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2026 Tax Summary — Retirement Accounts

Self-employed gig workers can contribute up to 25% of net self-employment income to a SEP IRA, or use a Solo 401(k) to contribute as both 'employee' (up to $23,500 in 2026) and 'employer' (up to 25% of net income), with a combined cap of $70,000. Every dollar contributed reduces your taxable income dollar-for-dollar.

Retirement contributions are one of the few deductions that both reduce your tax bill today and build wealth for the future. For high-earning 1099 workers, a Solo 401(k) often allows significantly larger contributions than a SEP IRA at the same income level.

Based on IRS Schedule C and Publication 334. General information only — not tax advice.

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Key Takeaways
  • 01A SEP IRA allows contributions of up to 25% of net self-employment income (after the SE tax deduction), with a 2026 dollar cap.
  • 02A Solo 401(k) allows an 'employee' deferral of up to $23,500 (2026) PLUS an 'employer' contribution of up to 25% of net income — often resulting in a larger total deduction at moderate income levels.
  • 03Both accounts must generally be opened by December 31 of the tax year, though SEP IRA contributions can be made up until your filing deadline (including extensions).
SEP IRA vs Solo 401(k) — Side by Side
SEP IRA ▼
25% of net SE income
Contribution Limit
Up to 25% of net self-employment income (after deducting half your SE tax), subject to an annual dollar cap.
Easy
Setup Complexity
Minimal paperwork — can typically be opened and funded with a single form at most brokerages.
By filing deadline + extensions
Contribution Deadline
Contributions can be made up until your tax filing deadline, including extensions to October.
Solo 401(k) ▼
$23,500 (2026)
Employee Deferral
Elective deferral as the 'employee' — similar to a traditional 401(k) salary deferral limit.
25% of net SE income
Employer Contribution
Additional 'employer' profit-sharing contribution, on top of the employee deferral.
$70,000 combined cap (2026)
Total Contribution Limit
Employee deferral plus employer contribution combined, subject to the overall annual limit.
Must open by Dec 31
Setup Deadline
The plan itself must be established by December 31 of the tax year, though some contributions can be made later.
Which Should You Choose? ▼
Simplicity priority
SEP IRA Wins
Best if you want minimal paperwork and don't need the maximum possible contribution.
Higher contributions at moderate income
Solo 401(k) Wins
At income levels where 25% alone wouldn't max out, the employee deferral often allows a meaningfully larger total contribution.
Either way
Both Reduce Taxable Income
Contributions to either account reduce your adjusted gross income dollar-for-dollar for the contribution amount.
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Estimated Tax by Income — 2026
Net IncomeSE TaxFederal TaxTotal Est.
$40,000 net~$7,400~$13,400Solo 401(k) higher
$60,000 net~$11,100~$17,100Solo 401(k) higher
$100,000 net~$18,500~$23,500+18,500Solo 401(k) higher
$200,000+ netCap reachedCap reachedSimilar near cap
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Frequently Asked Questions
“Net earnings from self-employment is your gross income from your trade or business minus allowable business deductions and the deduction for half of your self-employment tax.” — IRS.gov — Self-Employed Tax Center
What is the SEP IRA contribution limit for 2026?
You can contribute up to 25% of your net self-employment income (after the deduction for half of your SE tax), subject to an annual dollar cap set by the IRS each year for 2026.
What is the Solo 401(k) contribution limit for 2026?
For 2026, you can defer up to $23,500 as the 'employee' plus contribute up to 25% of net self-employment income as the 'employer', with a combined annual limit of $70,000 (higher if you qualify for catch-up contributions).
Which is better for a gig worker — SEP IRA or Solo 401(k)?
It depends on your income. At lower to moderate income levels, a Solo 401(k) often allows a larger total contribution because of the employee deferral component. SEP IRAs are simpler to set up but only allow the 25%-of-income employer-style contribution.
Do retirement contributions reduce my self-employment tax?
No. SEP IRA and Solo 401(k) contributions reduce your income tax (by lowering adjusted gross income) but do not reduce the self-employment tax calculated on Schedule SE.
When do I need to open a Solo 401(k) for 2026?
The Solo 401(k) plan must generally be established by December 31, 2026, to make contributions for that tax year — though some contribution deadlines extend to your filing deadline.
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⚠️ Disclaimer: This page provides general educational information only and is not personalized tax or legal advice. Deduction eligibility depends on your specific circumstances. Always follow IRS rules, keep detailed records, and report all income. Consult a licensed CPA or tax professional for advice tailored to your situation. IRS Gig Economy Tax Center →
Want a full list of every 1099 write-off?1099 Tax Deductions Ultimate Guide 2026 →
EB
Written & reviewed by
Ethan Blake
Small Business Tax & Compliance Expert
Writes about 1099 tax deductions, self-employment tax, and IRS rules for independent contractors and freelancers.
Last reviewed: IRS Self-Employed Tax Center →
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