IRA Tax Rules
An IRA is normally exempt from tax on its investment income. The exception is unrelated business taxable income (UBTI). When an IRA earns UBTI, it pays unrelated business income tax (UBIT), even inside a Roth IRA. Most IRA LLC investments never trigger it. Here is what does, how it is taxed, and how to plan around it.
IRC Section 512(b) excludes the passive income most IRA LLCs earn: interest on loans and notes, dividends, rents from real property, royalties, and gains from selling investment property. If your IRA LLC makes private loans or buys rental property with cash, that income is normally not UBTI.
UBTI is reduced by related deductions and a $1,000 specific deduction. When an IRA has $1,000 or more of gross UBTI for the year, the IRA must file IRS Form 990-T. The tax uses trust tax rates, which reach the top bracket at a much lower income than individual rates. The tax is paid from IRA funds, not your personal funds. The IRA is the taxpayer, so the custodian or IRA owner coordinates the filing with a tax preparer.
UBIT is a tax, not a penalty. A UBTI-producing investment is allowed in an IRA. It is different from a prohibited transaction, which can disqualify the entire IRA. Paying some UBIT can still leave you better off than the alternatives. Run the numbers.
This page is general education, not tax or legal advice. Consult a qualified tax professional about your situation.