These rules exist for one purpose: to prevent self-dealing and ensure your plan's tax advantages serve retirement growth, not current personal benefit. The penalties for violations are severe. Understanding these boundaries is critical for anyone operating a self-directed plan.
What qualifies as prohibited
IRC Section 4975(c)(1) defines five categories of prohibited transactions between a plan and a disqualified person:
| Prohibited Act | Explanation |
|---|---|
| Sales or exchanges | Any direct or indirect sale, exchange, or leasing of property |
| Extensions of credit | Lending money or providing a personal guarantee for a plan-level loan |
| Furnishing of goods or services | Providing labor, professional services, or facilities to the plan |
| Transfer or use of assets | Using plan income or assets for the personal benefit of a disqualified person |
| Self-dealing by fiduciaries | A fiduciary dealing with plan assets in their own interest or for their own account |
Indirect transactions and intermediaries
The IRS prohibits not only direct transactions but also indirect arrangements designed to bypass the rules.
"Straw man" deals. You cannot sell personally owned property to an unrelated third party with the pre-arranged intent for your IRA to purchase it shortly thereafter. The IRS "steps through" these transactions to identify the actual exchange of value between you and your plan.
Enabling investments. You cannot use your plan to invest in a private company if that investment is tied to a personal benefit, such as securing a job, promotion, or contract for yourself or a family member.
The "reverse benefit" problem
A common point of failure: disqualified persons providing value to the plan without compensation. This violates the rules just as much as taking value out of the plan.
The sweat equity violation. Your Solo 401(k) owns a rental property. You cannot perform any physical labor on that property, not painting, not repairs, not fixing a leaky faucet. Whether you're a professional contractor or a DIY enthusiast, your labor is a "provision of services" to the plan. Even unpaid labor is prohibited because it artificially inflates the plan's value using non-plan resources.
Common violation examples
Every plan interaction must be an arms-length transaction with an unrelated third party. Here are scenarios that cross the line.
Example 1: personal guarantee. Your IRA LLC obtains a mortgage for a property. You personally guarantee the loan or use your personal credit score to secure financing. Violation: this is an "extension of credit" between you (a disqualified person) and the plan. Note: the plan may use mortgage financing as long as the debt is non-recourse, meaning no personal guarantee is provided.
Example 2: co-investment benefit. Your IRA invests in a private fund. As a result, the fund manager allows you to invest personal funds with a fee waiver or at a lower entry point than other investors. Violation: this is prohibited use of plan assets for your personal benefit.
Example 3: transaction commissions. You're a licensed broker or insurance agent and earn a commission on an investment made by your own retirement plan. Violation: a fiduciary cannot receive consideration for their own personal account from any party dealing with the plan.
Example 4: facility sharing. Your Solo 401(k) owns a commercial warehouse. You use a corner of the warehouse to store your personal classic car collection. Violation: this constitutes furnishing of facilities by the plan to a disqualified person.
Tax penalties for violations
The consequences depend on your plan structure.
For IRAs, the nuclear option. If you engage in a prohibited transaction, the entire account is disqualified as of the first day of that tax year. The full fair market value is treated as a taxable distribution, which may also trigger an additional 10% early withdrawal penalty. Your entire IRA becomes immediately taxable.
For Solo 401(k) plans, excise taxes. The plan is generally not immediately disqualified. Instead, the IRS imposes a 15% excise tax on the amount involved for each year the transaction remains uncorrected. If you fail to correct the transaction, the penalty escalates to 100% of the amount involved.
Maintaining compliance
The best strategy is straightforward: choose clean, transparent investments and avoid the gray areas of self-dealing. Keep every transaction at arms-length. Use unrelated third parties. Never provide services, facilities, or personal guarantees to your plan.
By respecting these boundaries, you protect your tax-sheltered savings and ensure they're working exclusively for your future.
Frequently Asked Questions
What are the five categories of prohibited transactions?
Sales or exchanges, extensions of credit, furnishing of goods or services, transfer or use of plan assets, and self-dealing by a fiduciary. Any of these between a plan and a disqualified person is a prohibited transaction under IRC Section 4975(c)(1).
Can my IRA use debt financing without triggering a prohibited transaction?
Yes, as long as the loan is non-recourse. A personal guarantee on plan-level debt is an extension of credit between you and the plan and is prohibited.
Can I do repair work on a property my plan owns?
No. Even unpaid labor counts as furnishing a service to the plan and is prohibited, whether you're a professional contractor or doing it yourself.
What happens if my IRA engages in a prohibited transaction?
The entire account loses its tax-exempt status as of the first day of that tax year. The full fair market value becomes a taxable distribution, and an additional 10% early withdrawal penalty may apply.
What happens if my Solo 401(k) engages in a prohibited transaction?
The plan isn't immediately disqualified. Instead, a 15% excise tax applies to the amount involved for each uncorrected year, escalating to 100% if the transaction is never corrected.
What should I do if I'm not sure whether a transaction is prohibited?
Talk with a tax attorney or CPA experienced in self-directed plans before the transaction takes place, not after.