A 501(c)(3) can raise money through donations, grants, events, and earned income, but the 501(c)(3) fundraising rules reach almost every step of that work. Federal law dictates what the organization can spend money on, what receipts donors need, when revenue becomes taxable, and what must appear on the public Form 990. Roughly 40 states add their own registration requirement before a nonprofit can legally ask residents for a dollar. Getting any of it wrong can cost donors their deductions, trigger penalties, or in the worst cases strip the organization of its exempt status.
What a 501(c)(3) Cannot Fund
Fundraising strategy has to start with what the money can and cannot support, because a few activities will end an organization’s exemption no matter how well the campaign goes.
The Political Campaign Ban
A 501(c)(3) is completely barred from participating in any political campaign for or against a candidate for public office. This is not a spending limit. It is a total prohibition. Endorsements, one-sided candidate scorecards, donations to a campaign, and partisan posts on the organization’s social accounts can all qualify as prohibited activity. A violation can result in revocation of tax-exempt status and excise taxes on the political expenditures.
Lobbying Is Limited, Not Banned
Lobbying is a different story. Under the default “substantial part” test, a 501(c)(3) can lobby as long as the activity does not become a substantial part of what the organization does overall. The IRS weighs both time and money, with no fixed percentage. An organization that crosses the line can lose its exemption, and its managers can face a personal excise tax equal to 5% of the lobbying expenditures that triggered the loss.1Internal Revenue Service. Measuring Lobbying: Substantial Part Test
Groups that want harder numbers can make a 501(h) election, which replaces the vague standard with dollar limits. A charity with up to $500,000 in exempt purpose expenditures can spend 20% of that amount on lobbying. The percentage drops as the organization grows, and the maximum allowance caps at $1,000,000. Exceeding the limit triggers a 25% excise tax on the excess rather than automatic loss of exemption.2Internal Revenue Service. Measuring Lobbying Activity: Expenditure Test
No Private Inurement
No part of a 501(c)(3)’s net earnings can benefit any private shareholder or individual with a personal interest in the organization. Fundraising revenue cannot flow to insiders through inflated salaries, sweetheart contracts, or below-market loans, and the organization cannot operate primarily for the benefit of its founders, their families, or other designated private interests.3Internal Revenue Service. Inurement/Private Benefit: Charitable Organizations Violations can lead to revocation and to intermediate sanctions, which are excise taxes imposed directly on the individuals who received the excess benefit.
State Charitable Solicitation Registration
Federal tax-exempt status does not give a nonprofit permission to ask for donations in any state. Roughly 40 states require separate charitable solicitation registration first, typically filed with the state attorney general’s office or a dedicated charities bureau. Initial fees generally range from nothing to a few hundred dollars.
Many states accept the Unified Registration Statement, a standardized form that consolidates the data requirements across jurisdictions.4Multi-State Filer Project. Multi-State Filer Project Not every state accepts it, and some layer on additional requirements.
Online fundraising has made multi-state registration hard to avoid. A website with a donate button accessible nationwide can create registration obligations in every state where the organization actively targets residents or receives recurring contributions, whether or not it has a physical presence there. Soliciting without registration can lead to enforcement actions by the state attorney general, including orders to cease fundraising and potential fines. Renewal deadlines across dozens of jurisdictions have to be tracked year in and year out.
Donor Receipts and Disclosures
Federal law places specific documentation duties on the organization, and mistakes here hurt donors directly by putting their deductions at risk.
Written Acknowledgment at $250 and Above
A donor cannot claim a tax deduction for any single cash or property contribution of $250 or more without a contemporaneous written acknowledgment from the organization. The receipt must state the amount of cash contributed or describe the donated property, say whether the organization provided any goods or services in return, and give a good-faith estimate of the value of anything provided. If the only benefit was an intangible religious benefit, such as admission to a worship service, the receipt should say so instead of estimating a dollar value.5Office of the Law Revision Counsel. 26 U.S. Code 170 – Charitable, Etc., Contributions and Gifts “Contemporaneous” means the donor must have the acknowledgment in hand before filing their tax return for that year. Without it, the IRS can disallow the entire deduction on audit even if the donation clearly happened.
Quid Pro Quo Contributions Over $75
When a donor pays more than $75 and receives something of value in return, such as a gala dinner, an auction item, or merchandise, the organization must provide a written disclosure statement. The statement has to tell the donor that only the portion of the payment exceeding the fair market value of the benefit is deductible, and it must include a good-faith estimate of that value.6Office of the Law Revision Counsel. 26 U.S. Code 6115 – Disclosure Related to Quid Pro Quo Contributions If someone pays $200 for a fundraising dinner where the meal is worth $60, the receipt needs to spell out that only $140 qualifies as a charitable contribution.
Failure to provide the required disclosure carries a penalty of $10 per contribution, up to $5,000 per fundraising event or mailing. The penalty can be waived for reasonable cause.7Office of the Law Revision Counsel. 26 USC 6714 – Penalty for Failure to Meet Disclosure Requirements for Quid Pro Quo Contributions The $75 threshold is set by statute and has not been adjusted for inflation, so it catches a wide range of event tickets and benefit packages.8Internal Revenue Service. Charitable Contributions: Quid Pro Quo Contributions
Non-Cash and Vehicle Donations
Non-cash gifts add reporting layers, and the donor often needs the organization’s cooperation to complete their own paperwork. For donated property worth more than $500 but not more than $5,000, the donor files Form 8283 (Section A) with their tax return. Once the claimed value exceeds $5,000, the donor must obtain a qualified appraisal from a credentialed, independent appraiser and complete the more detailed Section B. The organization typically signs Part V of that form to acknowledge receipt, but signing does not endorse the donor’s claimed value.9Internal Revenue Service. Instructions for Form 8283 Stricter scrutiny applies to art valued at $20,000 or more, easements on historic structures, and any single item deduction over $500,000.10Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts
Vehicle donations have their own regime. If a charity receives a donated car, boat, or airplane and then sells it, the donor’s deduction is generally limited to what the charity actually received from the sale, not the vehicle’s blue book value. The organization must provide a written acknowledgment within 30 days of the sale that includes the gross proceeds. Donors can claim fair market value only if the charity certifies it will make significant use of the vehicle, materially improve it, or give it to a needy individual at well below market price.11Internal Revenue Service. A Donor’s Guide to Vehicle Donation
Keeping Public Charity Status: The Support Test
Fundraising strategy has to keep an eye on where the money is coming from. Public charities enjoy more favorable tax treatment and fewer restrictions than private foundations, but they have to prove they are genuinely supported by a broad base rather than controlled by a handful of wealthy backers. That proof comes through the public support test, measured over a rolling five-year period.12Internal Revenue Service. Exempt Organizations Annual Reporting Requirements – Form 990, Schedules A and B: Public Charity Support Test
Organizations that rely primarily on contributions from the public or on government grants fall under Section 509(a)(1). At least one-third of total support over the measurement period must come from public sources. A built-in safeguard caps any single donor’s contribution in the calculation at 2% of the organization’s total support. A donor who gives $50,000 to an organization with $1,000,000 in total support only adds $20,000 to the public support numerator. No single large gift can carry the organization past the threshold on its own. Groups that fall short of one-third can still qualify by receiving at least 10% from public sources and showing additional facts and circumstances, such as a diverse board, active fundraising programs, or wide community participation.
Because the test uses a five-year aggregate, one weak year will not automatically reclassify anyone. But if the ratio consistently falls short, the IRS can reclassify the organization as a private foundation, which brings excise tax on net investment income, strict limits on self-dealing, minimum annual distribution requirements, and restrictions on business holdings and certain expenditures.13Internal Revenue Service. Private Foundations The support ratio is worth watching each year rather than waiting for a notice.
Unrelated Business Income
Exempt status does not cover every dollar. When a nonprofit regularly earns income from a trade or business that is not substantially related to its exempt purpose, that income is subject to unrelated business income tax at the 21% corporate rate.14Internal Revenue Service. Unrelated Business Income Tax An organization with $1,000 or more in gross unrelated business income must file Form 990-T, and if the expected tax bill hits $500 or more, quarterly estimated payments are required.
Several common fundraising activities are specifically excluded:
- Activities where substantially all the work is performed by unpaid volunteers, such as a volunteer-run bake sale.
- Sales of donated merchandise, which covers thrift shops and similar operations.
- Convenience activities like a school cafeteria or hospital gift shop operated primarily for members, students, or patients.
- Bingo games that meet specific criteria.
These exclusions are written into Internal Revenue Code Section 513 and apply regardless of how much revenue the activity generates.15Office of the Law Revision Counsel. 26 USC 513 – Unrelated Trade or Business
Sponsorships Versus Advertising
Businesses often pay for acknowledgment at nonprofit events or in publications, and the tax treatment turns on where the acknowledgment stops. A qualified sponsorship payment, where the business gets nothing more than its name, logo, or product line mentioned, is not unrelated business income. Once the acknowledgment adds comparative language, pricing, endorsements, or a call to action to buy the sponsor’s products, it becomes advertising and can be taxable.16Internal Revenue Service. Advertising or Qualified Sponsorship Payments Payments tied to attendance levels, broadcast ratings, or other measures of public exposure also fail to qualify. If part of a payment qualifies and part does not, the IRS treats them as separate payments. Event programs that blur the line between thanking a sponsor and promoting their business are where organizations most often get tripped up.
Raffles and Charitable Gaming
Raffles, bingo, and casino-themed nights can raise real money and come with regulation many organizations underestimate. Gaming is regulated primarily at the state level, and the rules vary widely. Some states require separate gaming licenses for nonprofits, others restrict frequency or prize amounts, and a few prohibit charitable raffles altogether. State-specific gaming laws should be checked before anything involving prizes and chance is planned.
Federal reporting kicks in when there is a winner. For sweepstakes, raffles, and charity drawings, the organization must issue Form W-2G when winnings reach $600 or more and the payout is at least 300 times the wager. If winnings minus the wager exceed $5,000, the organization must withhold federal income tax at 24%.17Internal Revenue Service. Instructions for Forms W-2G and 5754 That withholding obligation catches organizations off guard. Awarding a $10,000 prize means the nonprofit needs to either collect the withholding from the winner or gross up the prize and pay the tax itself.
Federal postal law adds another trap. It prohibits mailing lottery tickets or related materials, and the U.S. Postal Service defines a lottery as any scheme combining prize, chance, and consideration (payment). A standard raffle ticket hits all three. Organizations can comply by removing the consideration element, such as offering a free entry method alongside paid tickets with a checkbox stating the person wishes to enter without making a donation.18Office of the Law Revision Counsel. 18 USC 1302 – Mailing Lottery Tickets or Related Matter Violations can result in fines and up to two years of imprisonment for a first offense.
Form 990 and Schedule G
The Form 990 is the nonprofit’s primary public financial document, and fundraising receives detailed scrutiny on it. The return and its schedules must be available for public inspection for three years after the filing due date.19Internal Revenue Service. Public Disclosure and Availability of Exempt Organization Returns and Applications: Public Disclosure Overview
Three separate $15,000 thresholds drive Schedule G. Part I applies to organizations that spend more than $15,000 on professional fundraising services. Part II applies when fundraising events generate more than $15,000 in combined gross income and contributions. Part III applies when gaming activities produce more than $15,000 in gross income.20Internal Revenue Service. Instructions for Schedule G (Form 990) The thresholds are independent, so an organization can trigger all three parts in the same year if it uses paid solicitors, hosts a gala, and runs a casino night.
The distinction between a professional solicitor and fundraising counsel matters for compliance and donor trust. A professional solicitor directly asks donors for money and often handles the funds before passing them to the nonprofit. Fundraising counsel works on strategy and planning but does not make the ask or touch donations. Many states require professional solicitors to post surety bonds and register separately from the nonprofit, and some require solicitation scripts to disclose the solicitor’s involvement and compensation.
The Form 990 also requires organizations to break expenses into three categories: program services, management and general, and fundraising. Costs tied to grant solicitation, direct mail, event production, and donor cultivation all fall under fundraising. Since the Form 990 is a public document, potential major donors and foundation grantmakers routinely review these ratios before writing checks, and an organization spending 60 cents to raise every dollar will attract scrutiny that one spending 15 cents will not.21Internal Revenue Service. Schedule G (Form 990) – Supplemental Information Regarding Fundraising or Gaming Activities