A 501(c)(3) determination letter is the one- or two-page document, printed on Department of the Treasury letterhead, in which the IRS confirms that an organization qualifies for federal tax-exempt status under Section 501(c)(3) of the Internal Revenue Code. It names the organization, lists its Employer Identification Number (EIN), sets the effective date of exemption, states the public charity classification, and confirms whether donations are tax-deductible. If you’ve just received one, need to produce one for a grantor, or want to check one an organization has handed you, this is the document doing the work.
What the Letter Looks Like
The letter arrives by mail after the IRS approves an application. In the upper-right corner sits a reference block: the EIN, a contact person, the toll-free IRS number (typically 1-877-829-5500), and the issue date. It’s addressed to the organization by legal name and mailing address, opens “Dear Applicant,” and states that the IRS has determined the organization is exempt from federal income tax under Section 501(c)(3).
Below that opening paragraph, a set of labeled fields carries the details a reader actually needs: the accounting period ending date, public charity status, whether Form 990 filing is required, the effective date of exemption, and whether contributions are deductible. The Director of Exempt Organizations Rulings and Agreements signs the letter, and an enclosure titled “Information for Organizations Exempt Under Section 501(c)(3)” usually comes with it.
If a document handed to you as a determination letter lacks the Treasury letterhead, the EIN reference block, or the signature line, treat that as a reason to verify through the IRS before relying on it.
Key Fields and What They Mean
- Employer Identification Number (EIN). The organization’s nine-digit federal tax ID. Use it to look the organization up in IRS databases.
- Effective Date of Exemption. The date from which the IRS recognizes the organization as tax-exempt. If the organization applied within 27 months from the end of the month it was formed, this date is generally retroactive to formation. Late filers usually get an effective date no earlier than the application submission date.1Internal Revenue Service. Form 1023 – Purpose of Questions About Organization Applying More Than 27 Months After Date of Formation
- Public Charity Status. The IRC subsection under which the organization is classified, such as 509(a)(1), 509(a)(2), or 509(a)(3). If no public charity classification appears, the organization is treated as a private foundation.2Office of the Law Revision Counsel. 26 USC 509 – Private Foundation Defined
- Contribution Deductibility. A “Yes” here means donors can deduct contributions under IRC Section 170.3Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts
- Form 990 Required. Indicates whether an annual information return is required. Most exempt organizations file some version of Form 990; very small ones may file an electronic notice instead.
- Accounting Period Ending. The end of the organization’s fiscal year, which fixes the annual filing deadline.
Why the Public Charity Line Matters
The classification line is more than paperwork. It changes what donors can deduct. Cash gifts to a public charity are deductible up to 60% of the donor’s adjusted gross income; cash gifts to a private foundation cap at 30%. Non-cash gifts of appreciated property cap at 30% for public charities and 20% for private foundations.4Internal Revenue Service. Publication 526 – Charitable Contributions
Most organizations filing Form 1023 want public charity status because higher donor limits make them more attractive to individual givers and grantmakers. Public charities generally draw a broad base of public support or exist to support other public charities. Private foundations tend to be funded by a single family or corporation. If the classification on your letter doesn’t match what you expected, address it early, because it shapes both your fundraising and your ongoing compliance obligations.
Getting a Copy of a Lost Letter
Keep the original letter permanently. Grantmakers, banks, and state agencies ask for it routinely. If you’ve lost yours, the path depends on when it was issued.
For letters issued on or after January 1, 2014, you can download a copy for free through the IRS Tax Exempt Organization Search (TEOS) tool. For letters issued before 2014, file Form 4506-B, Request for a Copy of Exempt Organization IRS Application or Letter. Form 4506-B also lets you request an affirmation letter, which serves the same function as the original for grantors and contributors.5Internal Revenue Service. EO Operational Requirements – Obtaining Copies of Exemption Determination Letter From IRS
Verifying a Letter Someone Gave You
If a nonprofit hands you a determination letter and you need to trust it, run the EIN through the IRS Tax Exempt Organization Search tool. You can confirm current exempt status, whether contributions are deductible today, and whether the status has been revoked.5Internal Revenue Service. EO Operational Requirements – Obtaining Copies of Exemption Determination Letter From IRS
A determination letter is a snapshot from the day it was issued. An organization could hold a valid letter from years ago and have since lost its exempt status. TEOS shows the current picture, which is why experienced grantmakers check it rather than relying on a PDF that arrives by email.
How Organizations Get One: Form 1023 vs. Form 1023-EZ
The letter follows IRS approval of an application. There are two application paths, and eligibility depends mostly on size.
Form 1023-EZ is the streamlined version. To use it, your projected annual gross receipts must not exceed $50,000 in any of the next three years, your gross receipts must not have exceeded $50,000 in any of the past three years, and total assets must not exceed $250,000.6Internal Revenue Service. Instructions for Form 1023-EZ The user fee is $275. The IRS issues about 80% of Form 1023-EZ determinations within 22 days.7Internal Revenue Service. Where’s My Application for Tax-Exempt Status
Form 1023 is the full application, required for larger organizations or those that don’t meet the 1023-EZ thresholds. The user fee is $600.8Internal Revenue Service. Form 1023 and 1023-EZ – Amount of User Fee Processing runs much longer. As of early 2026, the IRS issues 80% of Form 1023 determinations within 191 days, and complex applications can stretch beyond that.7Internal Revenue Service. Where’s My Application for Tax-Exempt Status
Keeping the Letter Valid
Receiving a determination letter is not the end of the story. Your organization must file an annual return or notice every year to keep its exempt status. Organizations with gross receipts of $50,000 or more file Form 990 or Form 990-EZ; smaller ones file Form 990-N, the e-Postcard.9Internal Revenue Service. Exempt Organization Annual Filing Requirements Overview The return is due by the 15th day of the 5th month after your fiscal year ends. Form 8868 buys a six-month extension if filed before the deadline.
Miss three consecutive years and the IRS automatically revokes your exempt status. No warning, no appeal, no discretion; the revocation happens by operation of law.10Internal Revenue Service. Automatic Revocation of Exemption Once revoked, the organization owes federal income tax on its earnings, donors can no longer deduct contributions, and the organization drops off the IRS’s public list. Small volunteer-run groups get caught this way when nobody realizes the filing requirement applies to them.
Reinstatement means filing a new application (Form 1023 or 1023-EZ) with the full user fee and catching up on missed returns. Apply within 15 months of the revocation date and meet certain conditions, and the IRS may reinstate retroactively. After 15 months, retroactive reinstatement becomes harder and requires showing reasonable cause.11Internal Revenue Service. Automatic Revocation – How to Have Your Tax-Exempt Status Reinstated
A Few Things the Letter Doesn’t Do
The determination letter only addresses federal income tax. It does not exempt your organization from state sales tax, property tax, franchise tax, or any other state-level obligation.12Internal Revenue Service. Frequently Asked Questions About Applying for Tax Exemption Most states require a separate application, and some issue their own exemption numbers distinct from your federal EIN.
Not every 501(c)(3) has a letter. Churches, their integrated auxiliaries, and conventions or associations of churches are automatically tax-exempt under Section 501(c)(3) without applying to the IRS, and donors can deduct qualifying gifts even if the church never sought recognition. Many churches still apply voluntarily, because a letter reassures donors and grantmakers.13Internal Revenue Service. Churches, Integrated Auxiliaries and Conventions or Associations of Churches Chapters of a national body may also be covered by a group exemption letter, which covers subordinate organizations at once and removes the need for each to apply separately.14Internal Revenue Service. Group Exemptions
Finally, if you’re a donor considering a gift to an organization whose application is still pending, deductibility depends on the outcome. If the IRS ultimately approves the application for the period covering your gift, your contribution is deductible; if the application is denied, it is not.15Internal Revenue Service. Contributions to Organization With IRS Application Pending That is where the 27-month rule protects early donors: an organization that files in time gets exemption backdated to its formation date, sweeping earlier gifts into the deductible window.