Self-Employed · Retirement
Solo 401(k) for Independent Contractors — 2026 Calculator
Independent contractors who receive 1099-NEC income can use a Solo 401(k) to shelter up to $70,000 per year and dramatically cut self-employment taxes.
2026 max contribution
$70,000
Typical income range
$60,000–$200,000
Catch-up (age 50+)
+$7,500
Deadline to open
Dec 31, 2026
Your 2026 retirement plan
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Solo 401(k) for Independent Contractors: What You Need to Know
Business structure
Most 1099 contractors file Schedule C. Those earning $80,000+ often benefit from S-Corp election, which separates salary (subject to SE tax) from distributions (not subject to SE tax). A Solo 401(k) works under any of these structures.
Income pattern & timing
Contract work can come in lump sums. Consider a Roth Solo 401(k) in low-income years and traditional pre-tax contributions in high-income years to optimize across tax brackets.
Key strategy
The biggest mistake 1099 workers make is not opening their Solo 401(k) before December 31 — contributions can be funded later, but the account must exist before year-end.
Solo 401(k) vs. SEP-IRA for independent contractors
A Solo 401(k) allows both an employee deferral (up to $23,500 in 2026) and an employer contribution (up to 25% of net compensation), for a combined maximum of $70,000. A SEP-IRA only allows employer contributions — no employee deferral. This means self-employed independent contractors earning under approximately $120,000 in net income can typically contribute more to a Solo 401(k) than a SEP-IRA.
How to open a Solo 401(k) as a independent contractor
- Get an EIN (free at IRS.gov, takes 5 minutes online). You need this even as a sole proprietor.
- Choose a provider. Fidelity, Schwab, and Vanguard offer free Solo 401(k) plans. Fidelity supports both traditional and Roth contributions with no fees.
- Open the account before December 31 of the tax year you want contributions to count.
- Fund the account by your tax filing deadline — April 15, or October 15 if you file an extension.
Frequently Asked Questions
Can independent contractors open a Solo 401(k)?
Yes. Self-employed independent contractors with Schedule C or 1099 income qualify for a Solo 401(k) as long as they have no full-time W-2 employees other than a spouse. The 2026 contribution limit is $70,000 ($77,500 with catch-up for those 50+).
Do I need an LLC to open a Solo 401(k) as a 1099 contractor?
No. A sole proprietor with 1099 income can open a Solo 401(k) under their Social Security Number. An LLC or EIN is not required, though many providers prefer an EIN (free from the IRS) for administrative simplicity.
What if I have both W-2 income and 1099 income?
You can still open a Solo 401(k) for your self-employment income. The $23,500 employee deferral limit applies across all plans combined, but the 25% employer contribution is calculated solely on your net self-employment earnings — completely separate from your W-2 contributions.
Can I make after-tax (Mega Backdoor Roth) contributions to a Solo 401(k)?
Some Solo 401(k) providers (Fidelity, E*Trade) support after-tax contributions and in-plan Roth conversions, enabling the Mega Backdoor Roth strategy. This can push your total annual contribution toward the $70,000 limit using after-tax dollars. Not all providers support this — check before opening.
Other Solo 401(k) guides
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