5 Solo 401(k) Investment Options Smart Business Owners Use in 2026

Are you tired of watching your Solo 401(k) sit idle in the same mutual funds and ETFs year after year? Many business owners do not realize their retirement plans can work much harder for them. Unlike traditional employer-sponsored 401(k) plans, Solo 401(k)s offer remarkable flexibility. Beyond typical stock market investments, your retirement funds can be directed into assets that match your expertise, risk tolerance, and long-term goals.

Smart entrepreneurs are increasingly diversifying their retirement portfolios with alternative investments that traditional accounts simply do not allow. The right Solo 401(k) structure puts you firmly in control of your retirement destiny.

This guide explores five powerful investment strategies that savvy business owners are leveraging in 2026: real estate, private equity, cryptocurrency, hard money lending, and precious metals. We will also touch on Roth contributions and participant loans as essential tools for tax planning and access to capital.

2026 Solo 401(k) Contribution Limits

Before diving into investment options, it is important to understand the official IRS contribution limits for Solo 401(k) plans in 2026.

Employee Elective Deferrals

• Participants under age 50 can contribute up to $24,500 as an employee.
• Participants age 50 or older can make an $8,000 catch-up contribution, for a total of $32,500.
• Participants age 60 to 63 may be eligible for a higher catch-up of $11,250, bringing total employee deferrals to $35,750.

Combined Employee and Employer Contributions

• The total limit from employee deferrals and employer profit-sharing is $72,000 for 2026.
• Catch-up contributions do not count toward this limit, so older savers can potentially contribute more than $80,000 when catch-ups are included.

These high contribution limits make Solo 401(k)s one of the most powerful tools for building wealth for self-employed business owners.

1. Self-Directed Real Estate Investments

Real estate is one of the most powerful investment options available in a Solo 401(k). Property investments offer tangible assets with distinctive tax advantages that are not available through traditional retirement accounts. Many business owners gravitate toward real estate because it provides both income potential and long-term appreciation.

Benefits

• Tax-deferred growth in a Traditional Solo 401(k) or tax-free growth in a Roth Solo 401(k).
• Historical U.S. returns on real estate investments range from 9 to 11 percent annually.
• Solo 401(k)s are exempt from Unrelated Business Taxable Income (UBTI) on real estate loans, unlike IRAs, under IRC Section 514(c)(9).

How to Invest

1. Open a Solo 401(k) that explicitly allows real estate holdings.
2. Make purchase offers in the name of the plan, not your personal name.
3. Pay all costs, including deposits, from the Solo 401(k).
4. Fund purchases through contributions, transfers, or rollovers.
5. Consider non-recourse financing if additional capital is needed.
6. Sign documents as the trustee, providing the plan’s trust agreement at closing.
7. Ensure all rental income flows directly back to your Solo 401(k).

IRS Compliance Rules

• No personal use by you, your family, or disqualified persons.
• All expenses must come from Solo 401(k) funds.
• You cannot personally perform maintenance or repairs.
• You and related businesses cannot receive commissions or benefits.

2. Private Equity and Startups

Private equity investments allow Solo 401(k) investors to access growth opportunities unavailable in public markets. Historically, private equity has returned 13.1 percent annually over 25 years, compared to just 8.6 percent for public equities.

Why Private Equity Fits Solo 401(k) Strategies

• Access to over 19,000 private companies with revenues exceeding $100 million compared to roughly 2,790 publicly traded equivalents.
• Less daily volatility due to quarterly valuations, creating steadier performance for long-term planning.
• Provides high-growth potential and portfolio diversification beyond traditional stocks and bonds.

How to Access Private Equity

1. Ensure your plan allows alternative investments.
2. Review offering documents, including private placement memorandums and subscription agreements.
3. List your Solo 401(k) trust as the investor.
4. Use the plan’s EIN on all documentation.
5. Wire funds directly from your Solo 401(k).

Risks and Compliance

• Investments typically lock capital for 7–10 years.
• High fees, often 2 percent management plus 20 percent of profits.
• Prohibited transactions: you cannot invest in your own business or companies owned by close relatives.

Consult a tax professional before investing to avoid prohibited transactions and penalties.

3. Cryptocurrency and Digital Assets

Digital assets have become a mainstream investment class for retirement portfolios. Nearly 25 percent of Americans have owned cryptocurrency at some point, making it a viable option for Solo 401(k) investors seeking diversification.

Benefits

• Low correlation with stocks and bonds, reducing portfolio risk.
• Potential for significant long-term appreciation.
• Recent regulatory changes make including cryptocurrency in retirement accounts more favorable.

How to Invest

• IRAfi Crypto Platform: Offers integrated trading of over 45 cryptocurrencies in a tax-advantaged account.
• Self-Directed IRA with LLC: Provides checkbook control, allowing trading across exchanges or cold wallet storage.

Security and Tax Treatment

• IRS treats cryptocurrency as property. Gains are tax-deferred in Traditional Solo 401(k)s or tax-free in Roth accounts.
• Use cold wallets for offline storage and never share private keys.

4. Hard Money Lending and Private Notes

Hard money lending allows business owners to turn their Solo 401(k) into a private lending machine. Loans backed by assets, typically real estate, can generate higher returns than traditional investments.

Benefits

• Short-term loans often provide higher interest rates.
• You act as the bank, earning interest directly into your account.

Structuring Notes

• Document loan amount, interest, maturity, and default provisions.
• List your Solo 401(k) as the lender.
• Create an amortization schedule and ensure payments flow back into the account.

Compliance and Risk

• Avoid prohibited transactions with disqualified persons.
• Charge reasonable interest rates.
• Consider professional loan servicing for documentation and collections.

5. Precious Metals and Commodities

Physical precious metals offer tangible assets that hedge against inflation and economic volatility.

Benefits

• Gold, silver, platinum, and palladium historically maintain long-term value.
• Non-correlated to stocks and bonds.
• Provide stability during turbulent markets.

IRS-Approved Metals and Storage

• Minimum fineness of 99.5 percent.
• Allowed coins: American Eagle, Canadian Maple Leaf, Australian Kangaroo, Austrian Philharmonic.
• Must be stored with a qualified third-party custodian; home storage is prohibited.

Roth and Mega Roth Contributions

Roth contributions are not investments themselves, but they are an essential tax strategy in retirement planning.

Roth vs Traditional Solo 401(k)

• Traditional contributions reduce taxable income now, but withdrawals are taxed as ordinary income.
• Roth contributions are made after-tax and grow tax-free, with withdrawals exempt from taxes if qualified.
• 2026 contribution ceiling: up to $72,000 annually for those under 50 and $80,000 for those 50 and older, including catch-ups.
• Roth Solo 401(k)s have no income limitations, unlike Roth IRAs.

Mega Backdoor Roth

• Allows higher Roth contributions by making after-tax contributions and converting them to Roth.
• Solo 401(k)s are exempt from non-discrimination testing, enabling high earners to maximize tax-free growth.

Advantages

• Tax-free growth and withdrawals in retirement.
• Roth 401(k)s are no longer subject to required minimum distributions, allowing indefinite tax-free compounding.

---

Solo 401(k) Participant Loans

Solo 401(k) plans allow business owners to borrow from their retirement funds without triggering taxes or penalties. This self-lending strategy provides access to capital when needed.

How loans work

• Borrow up to 50 percent of your vested account balance or $50,000, whichever is less.
• Repayment typically occurs over five years with interest paid back into your account.

When to use

• Significant personal expenses such as medical bills or home repairs.
• Business expenses including equipment or expansion costs.

Caution

• Defaulting on a loan triggers taxes and a 10 percent early withdrawal penalty if under age 59½.
• Outstanding balances are due immediately if self-employment ceases.

Conclusion

Solo 401(k)s offer flexibility far beyond traditional accounts. Real estate, private equity, cryptocurrency, hard money lending, and precious metals provide opportunities to build diversified, high-growth portfolios. Roth contributions and participant loans offer additional tax and liquidity strategies.

The right approach combines multiple investment types while remaining fully compliant with IRS rules. Document everything, consult qualified advisors, and take control of your retirement destiny.

Your Solo 401(k) is one of your most powerful wealth-building tools. Ambitious entrepreneurs deserve retirement strategies as dynamic as their businesses.

Which investment option will you explore first?