Figures: tax year 2026
Tax-exempt organizations can owe tax on unrelated business income (UBI), including commercial earnings and income reached by special inclusion rules. Unrelated business taxable income (UBTI) is the resulting tax base after permitted deductions and statutory adjustments.
To recall different types of unrelated business income, classification begins with the activity, then considers exceptions, income modifications, and special inclusions.
The ordinary business test requires all three conditions:
- Trade or business: Goods are sold or services performed with an income-producing business purpose. A commercial activity retains that character even when embedded within exempt operations or unprofitable during a...
- Regularly carried on: Frequency, continuity, and operating methods resemble those of comparable taxable businesses, including businesses operating during a normal commercial season.
- Not substantially related: The activity itself does not contribute importantly to the organization's particular exempt purpose. Spending its profits on charitable programs does not establish that relationship.
Failing a condition prevents ordinary business inclusion. Special rules can nevertheless include investment or ownership income without requiring the recipient's activity to satisfy that test.
Common mistakes
- Mission-funded profits. Using gadget-store profits for exhibits does not establish a relationship between the merchandise and education.
- Automatic annual-event exclusion. A seasonal operator can satisfy regularity even when its business opens only once each year.
- Wrong rental percentage. At exactly 50% personal-property rent, the real-property component can still qualify; the all-rent disqualification begins above 50%.
Bottom line
- Ordinary UBI requires an income-producing business, regular operation, and insufficient relationship to the exempt purpose.
- Volunteer labor, donated merchandise, convenience activities, and specified institutional or event activities qualify only when their conditions are met.
- Investment receipts and qualifying research income generally receive modifications subject to applicable special inclusion rules.
- Mixed rentals depend on personal-property rent percentages, the rental formula, tenant services, acquisition debt, and control.
Exam shortcut
Start with the actual customer, service, or merchandise. Separate unrelated product lines before judging the organization as a whole. For timing stems, identify the comparable commercial season and the full operating or solicitation pattern. For leases, mark personal-property rent percentage, gross-sales versus net-profit language, and tenant services before checking debt and control. For sponsorship, underline exactly what the sponsor receives; use stated market evidence to identify any supported sponsorship excess.
The full lesson (about 4,717 words, 31 min read) adds 6 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- II.E2
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