If your nonprofit has misplaced your 501(c) determination letter for the IRS, you can get a copy of an affirmation letter to have “proof” of your tax-exempt status. Call the IRS Customer Service for nonprofit organizations at 1-877-829-5500 and give them your nonprofit’s name and Employer Identification Number (EIN). After an agent determines the organization’s exempt status, it may issue an affirmation letter.
If you’re not sure if your nonprofit has 501(c)(3) tax-exempt status, click here.