Can You Use a Solo 401(k) to Invest in Private Real Estate?

Most people hear "retirement account" and think stocks, bonds, maybe a target-date fund. But if you have self-employment income — a side business, a consulting practice, a real estate brokerage, even a small LLC — you may have access to one of the most powerful and underused tools in the tax code: the Solo 401(k).

And yes, you can use it to invest in private real estate.

What Is a Solo 401(k), Exactly?

A Solo 401(k) — sometimes called an Individual 401(k) or i401k — is a retirement plan designed for self-employed individuals and business owners who have no full-time employees other than a spouse. Think freelancers, independent contractors, real estate agents, consultants, or anyone running a single-member LLC on the side.

What makes it powerful compared to a traditional IRA? The contribution limits are dramatically higher. In 2024, you can contribute up to $69,000 per year (or $76,500 if you're 50 or older) into a Solo 401(k). That's nearly ten times the $7,000 IRA limit. You're essentially wearing two hats: you contribute as the employee (up to $23,000) and again as the employer (up to 25% of net self-employment income), up to the combined ceiling.

More contributions mean more capital growing tax-deferred — and potentially deployed into private deals.

How Self-Direction Works

A standard Solo 401(k) at Fidelity or Vanguard keeps you in their fund lineup. To invest in private real estate, notes, or other alternative assets, you need a self-directed Solo 401(k) established through a custodian or administrator that explicitly permits alternative investments.

Once set up, your plan can invest in a wide range of assets the IRS does not prohibit — including:

• Private real estate equity deals (LLCs, LPs, syndications)
• Promissory notes and private lending
• Real estate funds
• Land contracts and deeds of trust

The plan itself holds the investment. Returns flow back into the plan, grow tax-deferred, and are not taxable until you take distributions in retirement.

Solo 401(k) vs. SDIRA: Which Is Better for Real Estate Investors?

Both a self-directed IRA (SDIRA) and a Solo 401(k) can hold private real estate, but they're not identical. Here's where the Solo 401(k) often has the edge:

Contribution limits. As noted above, Solo 401(k) limits dwarf IRA limits. If you want to build meaningful capital for real estate investing inside a tax-advantaged account, the Solo 401(k) gets you there faster.

Non-recourse loans. Both plan types can use non-recourse financing (loans secured only by the asset, not a personal guarantee). However, a Solo 401(k) has more flexibility in certain deal structures and may avoid or reduce Unrelated Business Income Tax (UBIT) in situations where an SDIRA would trigger it.

UBIT treatment. This is where it gets nuanced. When a retirement account uses debt financing (leverage), a portion of income may be subject to Unrelated Debt-Financed Income (UDFI) tax, which falls under UBIT. SDIRAs are generally subject to UDFI rules. Solo 401(k)s have a statutory exemption from UDFI — meaning if your plan invests in a leveraged real estate deal, you may owe no UBIT at all. For investors considering equity deals that use property-level debt, this difference can be significant.

Loan privilege. A Solo 401(k) allows you to borrow from your own plan — up to 50% of the vested balance or $50,000, whichever is less. SDIRAs do not allow this.

How to Get Started: The Practical Steps

Getting a Solo 401(k) set up for alternative investing is not complicated, but it does require the right setup from the beginning:

1. Confirm eligibility. You must have self-employment income from a business with no full-time W-2 employees (other than a spouse). A side 1099 or single-member LLC qualifies.
2. Choose a self-directed administrator. Not all Solo 401(k) providers allow alternative investments. Look for a custodian or administrator that explicitly supports private placements, notes, and real estate.
3. Establish the plan and trust. You'll receive a plan document and become the trustee of the trust that holds your plan assets.
4. Fund the account. Roll over existing 401(k) or IRA funds, or begin contributing from your self-employment income.
5. Identify a qualifying investment. Work with the operator or sponsor to confirm the deal structure is compatible with your plan type. Pre-qualified investors at firms like EXL Capital can review deal documents to discuss fit with their advisor.
6. Execute through the plan. The trustee (you) signs the subscription agreement on behalf of the plan. Funds wire from the plan's account. The plan becomes the investor.

Texas-Specific Considerations

For DFW-area investors, the Solo 401(k) is worth a closer look for one practical reason: real estate prices here mean deal minimums often start at $25,000–$50,000. A retirement account that can be funded up to $69,000 per year — and rolled over from old 401(k)s that may have been sitting idle — can reach deal minimums faster than an IRA with a $7,000 annual limit.

Texas also has a strong ecosystem of self-directed plan administrators, and the state's active private real estate market means deal flow is not a bottleneck for qualified investors who get connected to operators early.

Who This Strategy Is — and Isn't — For

A self-directed Solo 401(k) is a legitimate, IRS-recognized strategy. But it is not for everyone. You need self-employment income to open and contribute to one. You need the discipline to follow the administrative rules — because missteps can cost you the plan's tax-advantaged status. And you need a qualified CPA or tax attorney who knows self-directed retirement accounts, not just standard 401(k) plans.

If you clear those bars, the Solo 401(k) may be the most tax-efficient vehicle available for investing in private real estate — with higher contribution limits, stronger UBIT treatment, and broader flexibility than a standard SDIRA.

This article is educational only and is not an offer to sell securities or investment advice. Consult your own CPA, ERISA attorney, and financial advisor to evaluate whether a self-directed Solo 401(k) is appropriate for your situation.