The Prohibited Transaction Tripwires That Can Wipe Out Your Entire IRA

The Most Dangerous Word in SDIRA Law: "Disqualified"

Freedom is the defining feature of a self-directed IRA. But that freedom comes with an absolute ceiling: the IRS prohibited transaction rules under Internal Revenue Code Section 4975. These rules exist to prevent what Congress recognized as a fundamental conflict of interest — IRA owners using tax-advantaged retirement funds to personally benefit today, rather than preserving them for retirement.

The mechanism the IRS uses to enforce this principle is both elegant and brutal: define a class of "disqualified persons" and prohibit virtually all transactions between the IRA and those individuals or entities. The list of disqualified persons is broader than most investors assume.

Who Is a Disqualified Person?

Under IRC Section 4975, disqualified persons include:

• The IRA owner themselves
• The IRA owner's spouse
• Lineal ancestors (parents, grandparents) and lineal descendants (children, grandchildren) and their spouses
• Fiduciaries of the IRA — including your custodian and administrator
• Persons providing services to the IRA — accountants, attorneys, investment advisors
• Any entity 50% or more owned or controlled by any of the above
• Officers, directors, or highly compensated employees of entities that provide services to the IRA

Notably absent from this list: siblings, aunts, uncles, cousins, and friends. Transactions with these individuals through your IRA are generally permissible, provided they meet all other IRS standards.

The Specific Prohibited Transactions to Avoid

The IRS prohibits the following transaction types between an SDIRA and a disqualified person:

• Sale or exchange of property: The IRA cannot buy from, sell to, or lease with a disqualified person under any circumstances.
• Lending money or extending credit: The IRA cannot lend to or borrow from a disqualified person.
• Furnishing goods, services, or facilities: A disqualified person cannot provide services to the IRA in a way that constitutes prohibited self-dealing.
• Transfer or use of IRA assets: IRA assets cannot be used by or for the benefit of a disqualified person — even indirectly.
• Personal compensation: A fiduciary or disqualified person cannot receive improper compensation tied to IRA assets or transactions.

The Most Common Self-Directed IRA Mistakes

In practice, prohibited transaction violations tend to cluster around a few predictable scenarios:

• Personal use of IRA real estate: Purchasing a vacation property with SDIRA funds, then using it personally — even briefly. One or two nights qualifies as a prohibited transaction.
• Selling personal property to your IRA: Transferring appreciated real estate or other assets you personally own into your IRA.
• Lending to family members: Using your SDIRA to loan money to a child, parent, or spouse — regardless of market interest rates or legitimate documentation.
• Receiving compensation from IRA investments: As the IRA owner, you cannot be paid for managing a property or business that your IRA owns.
• Providing personal guarantees: Personally guaranteeing a loan on behalf of your IRA can constitute an indirect extension of credit — a prohibited transaction.

The Penalty Is Total and Retroactive

Here is the consequence that makes SDIRA compliance non-negotiable: a prohibited transaction does not merely trigger a penalty or a fine. It disqualifies the entire account as of January 1 of the year in which the violation occurred. Every dollar in the account is treated as if it was distributed on that date. If the account held $500,000, that entire amount becomes taxable income in a single year — and any portion attributable to earnings may also face the 10% early withdrawal penalty if the holder is under 59½.

The IRS also assesses a 15% excise tax under IRC §4975 on the amount involved in the prohibited transaction, escalating to 100% if the violation is not corrected within the same taxable year.

UBIT: The Silent Tax Inside Tax-Advantaged Accounts

Unrelated Business Income Tax (UBIT) is a separate compliance issue that surprises many SDIRA investors. Even inside a tax-advantaged account, certain income is taxable:

• Debt-financed income (UDFI): If your IRA uses leverage to purchase property, the income attributable to the borrowed portion is taxed at trust tax rates — which hit 37% at just $15,200 of taxable income in 2026. Your IRA files IRS Form 990-T to report and pay this tax.
• Active business operations: If your IRA invests in an entity that operates an active business rather than passively holding assets, the income from that activity can trigger UBIT.

Best Practices for Staying Compliant

Compliance in the SDIRA space comes down to three foundational principles:

1. Treat your IRA as a completely separate legal entity. Keep all money, paperwork, ownership, and benefit lines clearly separated from your personal financial life. Never commingle funds.
2. Document everything. Maintain complete records of all transactions, valuations, invoices, contracts, and payment flows.
3. Consult qualified advisors before acting. Your custodian processes transactions — it does not approve them. Before any transaction involving a person you know or a business you're connected to, get qualified legal and tax advice.