A nonprofit organization is a legally structured entity formed to serve a public or social mission rather than to generate profit for owners or shareholders. The defining rule is simple: any money the organization has left over after paying its expenses must be put back into the mission, never distributed to the people who run it. That single structural commitment is what separates a nonprofit from an ordinary business, and it is the foundation for the tax rules that follow.
Nonprofits cover an enormous range of activity. Hospitals, universities, churches, animal shelters, food banks, trade associations, and advocacy groups can all be organized as nonprofits. What they share is not the kind of work they do but the legal promise that no private individual profits from the surplus.
The Non-Distribution Constraint
The difference between a nonprofit and a for-profit company is not whether it can make money. Nonprofits can and often do bring in more revenue than they spend. The difference is what happens to that surplus. In a for-profit business, owners or shareholders keep the excess. In a nonprofit, every dollar of surplus has to be reinvested in the organization’s mission. Legal scholars call this the non-distribution constraint, and it governs every other rule nonprofits operate under.
The constraint applies to anyone who controls the organization: board members, officers, and voting members. None of them can receive a share of earnings. They can, however, be paid reasonable compensation for work they actually perform. A nonprofit executive director can earn a salary. A board member who provides outside consulting services can be paid a fair market rate for that work. The line is drawn at compensation that exceeds what a comparable position would pay at a similar organization. Crossing that line is what the IRS calls inurement, and it can cost the organization its tax-exempt status.
How a Nonprofit Is Formed
A nonprofit’s legal life begins at the state level. The founders file articles of incorporation with the state’s secretary of state or equivalent agency. The articles identify the organization’s purpose and commit it to the non-distribution constraint. Filing fees vary by state but generally run from around $30 to a few hundred dollars. Once the state accepts the filing, the organization exists as a legal entity able to open bank accounts, sign contracts, and hire staff.
State incorporation by itself does not make an organization tax-exempt. It creates a nonprofit corporation under state law, but without federal recognition from the IRS, that corporation still owes federal income tax on its earnings like any other business. State incorporation is a prerequisite for federal tax-exempt status, not a substitute for it.
Federal tax-exempt status is a separate designation granted by the IRS. It exempts the organization from paying federal corporate income tax on revenue tied to its exempt purpose. Organizations apply by filing the appropriate form for the category of exemption they are seeking, and the IRS issues a determination letter if the application is approved.
The Main Tax-Exempt Categories
The most widely recognized category is Section 501(c)(3) of the Internal Revenue Code, which covers organizations operated for religious, charitable, scientific, literary, or educational purposes, as well as the prevention of cruelty to children or animals.1Office of the Law Revision Counsel. 26 USC 501 – Exemption From Tax on Corporations, Certain Trusts, Etc. Organizations in this category apply using IRS Form 1023, which requires a detailed description of planned activities, governance structure, and financial projections. The standard user fee is $600, with a reduced $275 fee available on the streamlined Form 1023-EZ for smaller organizations that meet the eligibility thresholds.2Internal Revenue Service. Form 1023 and 1023-EZ: Amount of User Fee
The main practical benefit of 501(c)(3) status is that donations to the organization are generally tax-deductible for the donor. That deductibility makes fundraising considerably easier, because donors receive a tax incentive for their contributions. The tradeoff is strict limits on political activity, discussed below.
Not every tax-exempt nonprofit is a 501(c)(3). Section 501(c)(4) covers social welfare organizations that promote the common good of a community. These organizations are exempt from federal income tax, but donations to them are generally not tax-deductible for the donor.3Internal Revenue Service. Donations to Section 501(c)(4) Organizations In exchange, 501(c)(4) organizations can engage in far more lobbying and political activity than 501(c)(3) counterparts. A 501(c)(4) notifies the IRS of its existence by filing Form 8976 within 60 days of being organized.4Federal Register. Regulations on the Requirement To Notify the IRS of Intent To Operate as a Section 501(c)(4)
Federal exemption does not automatically extend to state taxes. Most states require separate applications for exemptions from state income tax, sales tax, and property tax, and the available exemptions vary. An organization that skips those filings can end up owing state taxes despite holding a federal determination letter.
Public Charity Versus Private Foundation
Every 501(c)(3) is classified by default as a private foundation unless it qualifies as a public charity.5Internal Revenue Service. EO Operational Requirements: Private Foundations and Public Charities The distinction matters because private foundations face stricter rules and additional excise taxes that public charities avoid.
The dividing line is where the money comes from. A public charity draws a substantial share of its support from the general public, government grants, or earned revenue. The IRS measures this through a public support test calculated over a five-year period, generally requiring that at least one-third of support come from public sources.6Internal Revenue Service. Exempt Organizations Annual Reporting Requirements – Form 990, Schedules A and B: Public Charity Support Test Churches, schools, and hospitals automatically qualify regardless of their funding mix. A private foundation, by contrast, is typically funded by a single family, individual, or corporation, and faces mandatory annual distributions and excise taxes on investment income. Most new nonprofits aim for public charity classification.
What Nonprofits Can and Cannot Do Politically
This is where organizations get into trouble most often, usually because they confuse two different things.
Political campaign activity is an absolute prohibition for 501(c)(3) organizations. The organization cannot endorse candidates, contribute to political campaigns, or make public statements for or against anyone running for office. There is no threshold and no safe harbor. Any amount of campaign intervention can cost the organization its tax-exempt status.1Office of the Law Revision Counsel. 26 USC 501 – Exemption From Tax on Corporations, Certain Trusts, Etc.
Lobbying is different. Lobbying means trying to influence specific legislation, and it is permitted for 501(c)(3) organizations as long as it does not become a “substantial part” of overall activities. The IRS applies a facts-and-circumstances test that weighs both the time and the money devoted to lobbying.7Internal Revenue Service. Measuring Lobbying: Substantial Part Test General advocacy and public education on issues, without reference to specific legislation, has no limit. Section 501(c)(4) organizations have more room: they can lobby as their primary activity and can participate in some political campaign activity, so long as it is not their primary purpose.
Governance and Fiduciary Duties
Every nonprofit is overseen by a board of directors or trustees. Board members owe three fiduciary duties recognized across virtually all states. The duty of care requires directors to stay informed and make decisions the way a reasonably careful person would, which means actually reading financial statements and attending meetings. The duty of loyalty requires putting the organization’s interests ahead of personal interests, especially when a director has a financial stake in a decision. The duty of obedience requires the board to keep the organization within its stated mission and in compliance with the law.
The duty of loyalty deserves extra attention. Conflicts of interest are where nonprofits most commonly stumble, and the IRS strongly recommends that every nonprofit adopt a written conflict of interest policy with procedures for identifying conflicts and requiring affected individuals to step out of the related votes.8Internal Revenue Service. Form 1023: Purpose of Conflict of Interest Policy Form 1023 asks whether the organization has adopted such a policy. It is not technically mandatory under federal law, but operating without one invites scrutiny.
Annual Reporting and Transparency
Because nonprofits benefit from a public subsidy through foregone tax revenue, they are required to operate transparently. The primary mechanism is the annual filing of IRS Form 990. Which version an organization files depends on its size:
- Form 990-N (e-Postcard) for organizations with gross receipts normally $50,000 or less.
- Form 990-EZ for organizations with gross receipts under $200,000 and total assets under $500,000.
- Form 990 for organizations at or above $200,000 in gross receipts or $500,000 in total assets.
Form 990 is a public document. It discloses revenue, expenses, program activities, governance practices, and the compensation of officers and key employees. Organizations must make their annual returns available for public inspection for three years from the filing due date or the date actually filed, whichever is later.9Internal Revenue Service. Public Disclosure and Availability of Exempt Organization Returns and Applications: Public Disclosure Overview Most Forms 990 are also accessible through online databases, which tends to make nonprofit finances more transparent than those of comparably sized private companies.10Internal Revenue Service. 2025 Instructions for Form 990
Automatic Revocation for Missed Filings
One rule here deserves special attention because small organizations learn about it the hard way. If a tax-exempt organization fails to file its required annual return for three consecutive years, the IRS automatically revokes its tax-exempt status. The revocation takes effect on the filing due date of the third missed return.11Internal Revenue Service. Automatic Revocation of Exemption
There is no warning and no appeal. The law does not allow the IRS to undo a proper automatic revocation. The organization must apply for reinstatement, which means going through the application process again and paying the user fee a second time. During the gap, the organization owes federal income tax on its earnings and cannot offer donors tax-deductible contributions. For a small nonprofit that simply forgot to file its annual e-Postcard, the cost of reinstatement dwarfs the few minutes the filing would have taken.
When Nonprofits Owe Tax Anyway
Tax-exempt status does not mean every dollar a nonprofit earns is tax-free. When a nonprofit regularly conducts a business activity that is not substantially related to its exempt purpose, income from that activity is subject to unrelated business income tax. Three conditions trigger it: the activity is a trade or business, it is regularly carried on, and it is not substantially related to the organization’s mission.12Internal Revenue Service. Unrelated Business Income Defined
A museum gift shop selling posters of its collection is mission-related. The same museum renting out a parking lot year-round to commuters probably is not. When unrelated business gross income reaches $1,000 or more, the organization files Form 990-T and pays tax on the net income.13Internal Revenue Service. 2025 Instructions for Form 990-T Several important exceptions apply. Activities staffed almost entirely by volunteers, sales of donated merchandise such as thrift shop goods, and convenience operations for members or students like a university cafeteria are all excluded.14Internal Revenue Service. Unrelated Business Income Tax Exceptions and Exclusions Passive investment income such as dividends, interest, and royalties is generally excluded as well.
Excess Benefit Transactions
When someone with substantial influence over a nonprofit receives compensation or other economic benefits that exceed the fair market value of what they provided, the IRS treats it as an excess benefit transaction. The person who received the excess benefit owes a tax equal to 25 percent of the excess amount. If the situation is not corrected within the taxable period, a second tax of 200 percent of the excess benefit applies.15Office of the Law Revision Counsel. 26 USC 4958 – Taxes on Excess Benefit Transactions Organization managers who knowingly approved the transaction face their own 10 percent penalty, capped at $20,000 per transaction. These intermediate sanctions let the IRS target the responsible individuals while keeping the organization intact.
What Happens If a Nonprofit Closes
When a nonprofit shuts down, it cannot divide up the remaining assets among board members or staff. The organizing documents of a 501(c)(3) must include a dissolution clause specifying that assets will go to another tax-exempt organization or to a government entity for a public purpose.16Internal Revenue Service. Does the Organizing Document Contain the Dissolution Provision Required Under Section 501(c)(3) The IRS checks for that clause during the initial application for exempt status.
When it is time to dissolve, the organization files a final return. For Form 990 and 990-EZ filers, that means checking the “Terminated” box and completing Schedule N, which details how assets were distributed. The final return is due by the 15th day of the fifth month after the termination date.17Internal Revenue Service. Termination of an Exempt Organization The organization also files any required dissolution documents with the state where it was incorporated. Skipping the state filing can leave a defunct nonprofit on the books, accumulating penalties for missed state filings years after it stopped operating.