Form 990-T: When an IRA Owes Unrelated Business Income Tax

Normally, a traditional IRA or Roth IRA grows tax-free — no capital gains tax, no annual income tax on dividends or interest. But certain aggressive or unconventional investments can generate unrelated business income tax (UBIT), requiring the IRA to file Form 990-T with the IRS and pay tax on that specific income. Understanding which investments trigger this hidden liability is crucial for IRA account owners.

What is unrelated business income?

The tax code grants IRA accounts and other retirement vehicles an exemption from income tax on investment gains. But Congress carved out an exception: if an IRA invests in a business or uses debt to amplify returns, that income is taxed as “unrelated business income” (UBIT). The logic is that using leverage or operating a business within a tax-sheltered account would give unfair competitive advantage over taxable investors.

UBIT is taxed at the plan level — not the account owner’s personal tax bracket. The IRA itself calculates, owes, and pays the tax, typically from account assets. This is rare and often painful because the account owner may not expect it.

Leveraged real estate and mortgage debt

The most common UBIT trigger is real estate purchased with a loan (mortgage). If you use your IRA to buy a rental property and finance part of it with debt, the income from that property is subject to UBIT.

Example: Your IRA purchases a commercial building for $500,000, putting down $250,000 in cash and borrowing $250,000. The property generates $30,000 in annual rent and $8,000 in expenses, leaving $22,000 in net income. Because the property was purchased with debt, all or a portion of that $22,000 is UBIT, taxed to the IRA at the 21% corporate rate. The IRA owes roughly $4,620 in tax.

This rule is called “debt-financed property income” (DFPI). The percentage of income that is UBIT depends on the ratio of debt to the property’s value. If your IRA owns 50% equity and 50% debt, approximately 50% of the net income is UBIT.

Note: If the property is purchased entirely with the IRA’s cash — no debt, no mortgage — the rental income is not UBIT and is not taxed.

Master Limited Partnerships (MLPs)

MLP interests held in a retirement account often trigger UBIT. MLPs are structures (common in energy and infrastructure) where distributions are treated as “unrelated business income” under tax law, specifically because they are treated as trading in commodities or involving active business operations.

An IRA holding MLP units worth $50,000 that distributes $4,000 annually would owe tax on that $4,000 at the 21% corporate rate — $840 — even though the MLP itself is a passive holding. The IRA custodian is required to file Form 990-T and remit the tax.

Commodities, futures, and options trading

Day trading or frequent short-term options strategies within an IRA can generate UBIT if the activity crosses the line into “running a trade or business.” The line is blurry — buy-and-hold stock investors are safe; a trader executing dozens of contracts per month is at risk.

Specifically, if an IRA makes more than a certain number of trades (roughly, if it engages in active commodity or options trading operations as opposed to passive investing), the income from those activities is treated as unrelated business income.

Direct business ownership

If the IRA owns all or part of an operating business — say, an S-corp or LLC generating net profit — that business income is almost always UBIT. The IRA cannot own a business interest and shield the operating profit from taxation.

How the $1,000 threshold works

Form 990-T is required only if the IRA’s unrelated business income exceeds $1,000 in a single tax year. If the leveraged property generates $900 in net income, no Form 990-T is required and no UBIT tax is due. At $1,001, the threshold is crossed, and Form 990-T must be filed for the entire amount.

This $1,000 threshold applies to most IRAs and Roth accounts, though certain other tax-exempt entities face higher or lower thresholds.

Who files Form 990-T?

The IRA custodian (the bank, brokerage, or IRA administrator) is responsible for filing Form 990-T. The account owner cannot file it themselves. If your custodian discovers UBIT, they will notify you and often charge a fee — sometimes hundreds of dollars — to prepare and file the return.

If your custodian fails to file or incorrectly calculates UBIT, the IRA itself can face penalties, and the IRS may assess additional tax and interest.

Planning around UBIT

Many IRA owners are unaware they’re triggering UBIT until the custodian sends an unexpected bill. Strategies to avoid it include:

• Purchasing real estate in an IRA entirely with cash (no mortgage).
• Using a non-IRA account or C-corporation structure to hold MLP interests or leveraged real estate.
• Confirming with the custodian and a tax advisor before investing in alternatives like MLP units, commodities, or options strategies.

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