Unrelated Business Income Tax Explained

Unrelated business income tax (UBIT) is a federal tax that applies when a tax-exempt organization — typically a nonprofit, charity, or educational institution — earns money from a business that has nothing to do with its main purpose. The IRS taxes that specific income stream at the regular corporate tax rate, even though the organization itself is exempt from income tax.

The key word is unrelated. If a nonprofit's income comes directly from its stated mission, it is not taxed. A food bank's donations are not taxed. A university's tuition is not taxed. But if that same university runs a bookstore that sells general merchandise, or if the food bank operates a thrift shop, the profit from those side businesses may be subject to UBIT.

Most small nonprofits never encounter UBIT because they do not run separate businesses. But as organizations grow or diversify their revenue, understanding when UBIT applies can save them from an unexpected tax bill or penalties for not filing when required.

Key Takeaways

  • UBIT applies only to income from a business that is unrelated to the organization's tax-exempt purpose, not to donations or income directly tied to the mission.
  • The IRS uses a three-part test: the activity must be a trade or business, it must be regularly carried on, and it must be substantially unrelated to the exempt purpose.
  • Organizations that owe UBIT must file Form 990-T with the IRS, even if they owe zero tax, if gross income from unrelated sources exceeds a threshold (currently $1,000).
  • Some types of income are automatically exempt from UBIT, including passive investment income like dividends and interest, and income from certain volunteer-run activities.
  • Penalties for not filing Form 990-T when required can be steep, and the IRS actively audits nonprofit tax filings.

The Three-Part Test for Unrelated Business Income

The IRS does not tax a nonprofit straightforward because it makes money. Instead, it applies a three-part test to determine whether income counts as unrelated business income. All three parts must be true for UBIT to explore.

First, the activity must be a trade or business — meaning it involves selling goods or services for a profit, not just receiving donations or grants. A nonprofit that sells t-shirts with its logo is running a business. A nonprofit that receives a grant from a foundation is not.

Second, the business must be regularly carried on. A one-time fundraiser or occasional sale does not trigger UBIT. But a gift shop that operates year-round, or a consulting service that takes on regular clients, does. The IRS looks at frequency and continuity, not just whether the activity happens more than once.

Third, the business must be substantially unrelated to the organization's exempt purpose. This is where the line gets blurry. A university bookstore that sells textbooks directly supports student learning, so it is related. A university bookstore that also sells greeting cards and coffee mugs — those items are unrelated, and profit from them may be taxable.

What Income Is Exempt From UBIT

Not all income a nonprofit earns is subject to UBIT, even if it comes from a business activity. The IRS carves out specific categories that are always exempt.

Passive investment income is the biggest exemption. Dividends from stocks, interest from bonds, rental income from real estate, and capital gains from selling investments are not taxed as UBIT, even if the nonprofit earned millions. This is true whether the nonprofit actively manages the investments or holds them passively.

Income from volunteer-run activities is also exempt. If a nonprofit's thrift shop is staffed entirely by volunteers and generates profit, that profit is not subject to UBIT. The moment the nonprofit hires paid staff to run the shop, the exemption may disappear.

Certain other activities are automatically exempt by law: income from selling donated merchandise (like a thrift shop), income from activities where at least 85 percent of the workers are volunteers, and income from certain educational activities conducted for members. The rules are specific, and the IRS publishes detailed guidance on each.

When You Must File Form 990-T

If a nonprofit has unrelated business income above a certain threshold, it must file Form 990-T with the IRS, regardless of whether it owes any tax. For the 2024 tax year, that threshold is $1,000 in gross income from unrelated sources.

Form 990-T is separate from the nonprofit's main annual return (Form 990 or Form 990-N). It reports the unrelated business income, deducts expenses directly tied to that income, and calculates the tax owed at the corporate tax rate — currently 21 percent on net income.

The form is due on the same day as the organization's regular income tax return, which is typically April 15 for calendar-year organizations. Filing late or not filing when required can result in penalties of $25 to $100 per day, depending on how long the failure continues.

Examples of Unrelated Business Income

A nonprofit hospital runs a gift shop that sells flowers, balloons, and candy to visitors. The hospital's exempt purpose is providing medical care. The gift shop is a business, it operates regularly, and selling gifts is unrelated to healthcare. Profit from the gift shop is subject to UBIT.

A nonprofit educational organization publishes textbooks related to its teaching mission and sells them to schools nationwide. The publishing is a business and it operates regularly, but it is directly related to the organization's purpose of education. Income from textbook sales is not subject to UBIT.

A nonprofit environmental group receives a $50,000 grant from a foundation to fund its conservation work. Grants are not business income, so UBIT does not explore, even though the organization is earning money.

A nonprofit museum owns a building and rents out office space on the second floor to unrelated tenants. The rental income is passive investment income, so it is exempt from UBIT under the investment income exclusion.

A nonprofit youth organization runs a summer camp for members and charges tuition. The camp is a business, it operates regularly, but it is directly tied to the organization's purpose of serving youth. Tuition income is not subject to UBIT.

How Unrelated Business Income Affects Tax-Exempt Status

Having unrelated business income does not automatically revoke a nonprofit's tax-exempt status. An organization can earn money from unrelated sources, pay UBIT on that income, and remain tax-exempt overall. The tax applies only to the unrelated income, not to the entire organization.

However, if unrelated business income becomes the organization's primary activity or source of revenue, the IRS may question whether the organization still qualifies as tax-exempt. The exempt purpose must remain the organization's primary focus. If a nonprofit spends most of its time and resources running a business unrelated to its mission, the IRS can revoke its exemption.

This is a judgment call based on the organization's actual operations, not a bright-line rule. An organization that earns 10 percent of its revenue from an unrelated business is almost certainly safe. An organization that earns 80 percent from an unrelated business is at serious risk.

How to Report and Pay UBIT

Organizations that owe UBIT must calculate the tax and pay it along with Form 990-T. The calculation starts with gross income from the unrelated business, subtracts ordinary and necessary expenses directly tied to that business, and applies the corporate tax rate to the net result.

Expenses must be directly related to generating the unrelated income. If a nonprofit runs a gift shop, it can deduct the cost of goods sold, rent for the shop space, and staff salaries for shop employees. It cannot deduct the executive director's salary or general overhead, even though those costs support the entire organization.

Payment is due by the tax return important date. Organizations can pay in full with the return, or they can make quarterly estimated tax payments throughout the year if they expect to owe more than $500. The IRS provides worksheets and instructions with Form 990-T to help calculate the amount.

Frequently Asked Questions

Does a nonprofit have to stop running unrelated businesses to stay tax-exempt?

No. A nonprofit can run unrelated businesses and remain tax-exempt. It must pay UBIT on the profit from those businesses, but that does not affect its overall exempt status. The unrelated business cannot become the organization's primary activity.

What if a nonprofit's unrelated business income is less than $1,000 per year?

It does not have to file Form 990-T. However, it should still track the income and expenses in case the IRS asks. If income grows above $1,000 in a future year, the organization must file starting that year.

Can a nonprofit deduct losses from an unrelated business against its other income?

No. If an unrelated business loses money, the nonprofit cannot use that loss to reduce tax on other income. Losses from unrelated businesses can only offset gains from other unrelated businesses on the same Form 990-T.

Is rental income from a building the nonprofit owns subject to UBIT?

Rental income is passive investment income and is exempt from UBIT. This is true even if the nonprofit rents to a for-profit business or a business unrelated to the nonprofit's mission. The exemption applies to the type of income, not to what the tenant does with the space.

What happens if a nonprofit does not file Form 990-T when it should?

The IRS can assess penalties starting at $25 per day for each day the return is late, up to a maximum of $15,000 per year. The organization may also owe interest on any unpaid tax. The IRS actively audits nonprofit returns, so unfiled forms are often discovered during routine reviews.