The Solo 401(k) is the most tax-advantaged retirement vehicle available to self-employed individuals and owner-only businesses. We provide IRS-compliant plan documentation, ongoing administration, and expert guidance — tailored to your situation. There is no setup fee and no termination fee on any of our plans.
Complete this brief questionnaire and a plan specialist will follow up within one business day.
Mrs401k.com is operated by Craig Lewis Gillooly, an attorney licensed to practice in good standing in California and New York, specializing in qualified retirement plan documentation and administration. Our practice administers 401(k) plans of all sizes — from Solo 401(k) plans for owner-only businesses to full ERISA-governed plans for employers with employees. 401kAdministrators.com holds the historic distinction of being the very first company registered as a Pooled Employer Plan (PEP) provider with the United States Department of Labor, providing the same quality of plan administration available to large corporations, accessible to businesses of every size.
We handle the administrative complexity. Most clients receive IRS-approved plan documentation within 24 hours of completing their consultation.
Complete our brief online questionnaire. We gather the information needed to tailor your plan documents to your specific business structure and goals.
Our specialists prepare your IRS-compliant Solo 401(k) plan documents — including the Plan Document, Adoption Agreement, and any applicable addenda.
Open your plan account at a custodian of your choosing — Fidelity, Schwab, TD Ameritrade, or a self-directed custodian for alternative investments.
We provide annual Form 5500-EZ filing reminders, contribution limit updates, and compliance guidance as your plan balance grows.
Designed for owner-only businesses, the Solo 401(k) offers features unavailable in simpler plan types such as the SEP-IRA or SIMPLE IRA.
Contribute up to $72,000 in 2026 ($80,000 if age 50–59 or 64+; $83,250 for ages 60–63 under the SECURE 2.0 enhanced catch-up provision) — combining employee deferral and employer profit-sharing components.
Elect pre-tax Traditional contributions, post-tax Roth contributions, or both. Mega Backdoor Roth conversions are available where permitted by the plan.
A self-directed Solo 401(k) permits investment in real estate, private equity, precious metals, and other non-traditional asset classes not available at retail custodians.
Borrow up to 50% of your vested account balance (maximum $50,000) without incurring early distribution penalties — a feature unavailable in SEP and SIMPLE IRAs.
We provide annual reminders for Form 5500-EZ filing requirements (required when plan assets exceed $250,000), contribution deadlines, and regulatory updates. At no additional cost, clients receive access to our electronic Form 5500 filing software — fast, straightforward, and developed by an approved software provider recognized by the United States Department of Labor.
If a spouse earns compensation from the business, they may also participate in the plan — effectively doubling the household's annual contribution capacity.
The following table illustrates the key distinctions between the Solo 401(k) and other retirement plans commonly available to self-employed individuals.
| Plan Type | 2026 Annual Limit | Roth Option | Alt. Investments | Loan Provision | Catch-Up (50–59 / 60–63) |
|---|---|---|---|---|---|
| Solo 401(k) — Mrs401k | $72,000 | ✓ | ✓ | ✓ | +$8,000 / +$11,250 |
| SEP-IRA | $70,000 | ✗ | Limited | ✗ | None |
| SIMPLE IRA | $17,600 | ✗ | ✗ | ✗ | +$3,500 |
| Traditional / Roth IRA | $7,000 | ✓ | Limited | ✗ | +$1,000 |
* Contribution limits reflect IRS guidelines for 2026 and are subject to change. Eligibility for specific contribution amounts depends on net self-employment income. This table is for informational purposes only; consult a qualified tax professional regarding your individual circumstances.
For those in the research phase, we have prepared a complimentary PDF covering the key information needed to evaluate a Solo 401(k) for your situation.
Enter your email address and we will send the guide directly to your inbox. No further obligation.
We have assisted independent professionals, consultants, business owners, and employers of all sizes in establishing and maintaining IRS-compliant 401(k) plans since 2003.
"I had been using a SEP-IRA for years. After transitioning to a Solo 401(k) through Mrs401k, I was able to shelter an additional $28,000 in income in the first year alone."
"The process was straightforward. I submitted the questionnaire, received my plan documents within 24 hours, and the team was available to answer every question I had along the way."
"They proactively reminded me about Form 5500-EZ filing requirements before I reached the $250,000 threshold. That level of attention to compliance is what distinguishes this practice."
Answers to the questions we hear most often from self-employed professionals considering a Solo 401(k).
Request a complimentary consultation. A plan specialist will review your situation and outline the appropriate plan structure, documentation requirements, and next steps. There is no setup fee and no termination fee on any of our 401(k) plans.