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If you work for yourself, you have probably been handed the same short list of retirement choices as everyone else. Open an IRA, set aside a few thousand dollars, pick from a menu of funds, and hope for the best. What almost nobody tells the self-employed is that there is a different account built specifically for a business of one, and it changes the math in a big way.
It is called the Solo 401(k). When it is self-directed, it lets you set aside far more than an IRA and hold a much wider range of assets. There is also one rule around real estate that a self-directed IRA simply cannot match. We will get to that near the end.
A Solo 401(k) is a 401(k) designed for a business with no full-time employees other than the owner and a spouse. That single sentence is the whole eligibility test. If you are a freelancer, a real estate agent, a contractor, a consultant, a one-person LLC, or you run a side business with real self-employment income, you may qualify.
A working spouse can participate in the same plan, which raises how much a household can set aside. And when the plan is self-directed, you are not limited to a preset fund menu. You hold the assets, and Mountain West IRA, as the Administrator, handles the account and the paperwork. We do not give advice, and we do not sell assets. We keep the plan running so you can focus on what you know best.
The reason the Solo 401(k) stands out is that you contribute in two roles at once, as the employee and as the employer. For 2026, the employee side lets you defer up to $24,500. The employer side lets you add more on top, up to a combined limit of $72,000 for those under age 50.
At age 50, a catch-up raises the combined total to $80,000. For those between ages 60 and 63, an enhanced catch-up pushes it to $83,250. Set that against a traditional or Roth IRA, which is capped at $7,500 for 2026. Same person, same income, a dramatically different ceiling. Contribution limits are updated each year, so confirm the current figures before you file.
Self-directed means the range of assets opens up well beyond the usual menu. Real estate, private notes, precious metals, and private companies are among the options a Solo 401(k) can hold, as long as the plan follows the rules and steers clear of prohibited transactions.
Two features tend to surprise people. First, a Solo 401(k) has a built-in Roth option, so part or all of the plan can grow tax-free for later. Second, it has a participant loan feature. You can borrow from your own plan, up to $50,000 or half the account balance, whichever is less, and repay it on a set schedule. An IRA offers nothing like that. None of this is a suggestion about what to hold. It is a description of how the account works and what the rules make possible.
Here is the rule we promised. When a self-directed IRA buys real estate using a loan, the debt-financed portion of the income can trigger a tax called UDFI, short for unrelated debt-financed income. It is a real cost, and it catches many account holders off guard.
A Solo 401(k) receives a specific carve-out from UDFI on leveraged real estate. The same property, bought with the same loan, is treated differently depending on which account holds it. This is exactly the kind of detail that rarely comes up when someone is selling a standard account, because there is no reason for them to raise it. We are not telling you what to do with it. We are pointing out that the rules exist so you can ask the right questions.
Mountain West IRA is a self-directed account Administrator based in Boise, Idaho. Our role is the account itself: opening it, handling the paperwork, and keeping it compliant as you direct the assets. We do not give investment, tax, or legal advice, and we do not sell assets. The decisions stay with you and the professionals you choose to work with.
What is a self-directed Solo 401(k)?
It is a 401(k) for a business with no full-time employees other than the owner and spouse, set up so the account holder can direct a wide range of assets rather than choosing from a preset fund menu.
Who qualifies for a Solo 401(k)?
Anyone with self-employment income and no full-time employees other than a spouse. That includes freelancers, contractors, real estate agents, consultants, and one-person LLCs.
How much can I contribute to a Solo 401(k) in 2026?
Up to $24,500 as the employee, and up to $72,000 combined for those under 50. A catch-up raises it to $80,000 at age 50, and to $83,250 for ages 60 to 63. Verify current limits before filing.
Can a Solo 401(k) hold real estate?
Yes, real estate is among the assets a self-directed Solo 401(k) can hold, as long as the plan follows the rules and avoids prohibited transactions.
What is UDFI, and how does a Solo 401(k) handle it?
UDFI is unrelated debt-financed income, a tax that can apply to leveraged real estate held in a self-directed IRA. A Solo 401(k) has a carve-out from UDFI on leveraged real estate.
Can I borrow from my Solo 401(k)?
A Solo 401(k) has a participant loan feature. You can borrow up to $50,000 or 50% of the balance, whichever is less, and repay it on a set schedule.
How is a Solo 401(k) different from a self-directed IRA?
The Solo 401(k) allows much higher contributions, has a built-in loan feature, and carves out UDFI on leveraged real estate. An IRA has fewer setup requirements and no employment test.
Can I roll an old 401(k) or IRA into a Solo 401(k)?
In many cases, yes. Old employer 401(k) accounts and existing IRAs can often be rolled into a Solo 401(k). The details depend on your situation.
Is there a Roth version?
Yes. A Solo 401(k) can include a Roth option, so part or all of the plan can grow tax-free for later.
Does Mountain West IRA give advice?
No. Mountain West IRA is an Administrator. We handle the account and the paperwork. We do not give investment, tax, or legal advice, and we do not sell assets.
To keep learning, visit our educational videos library on YouTube: https://www.youtube.com/@MountainWestIRA/videos
Ready to take more control of your retirement?
Mountain West IRA can help you open a Self-Directed IRA or Solo 401(k), so you can invest in what you know best.
📞 Call us at 866-377-3311
📅 Schedule your free consultation: https://outlook.office365.com/book/MountainWestIRA@mwira.com/?imsaljsauthenabled=true
You can explore our educational content on our YouTube channel and visit our blogs.
https://www.youtube.com/@MountainWestIRA & https://www.mountainwestira.com/blog
If this topic sparked questions, reach out to our team. We are here to help you understand the rules, the process, and how self-directed retirement accounts work.
Not investment, tax, or legal advice. Check with your own financial advisor about your specific situation.
This post is for informational purposes only and should not be considered financial advice. Please consult with a financial advisor for personalized advice.
Mountain West IRA, Inc. does not render tax, legal, accounting, investment, or other professional advice. If accounting, tax, legal, investment, or other similar expert assistance is required, the services of a competent professional should be sought.
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