A § 501(c)(3) organization that is not classified as a private foundation must file what type of annual information return?

A § 501(c)(3) organization that is not classified as a private foundation is indeed required to file Form 990 as its annual information return. Form 990 is specifically designated for public charities and provides the IRS and the public with essential information about the organization's finances, activities, and governance. This form helps ensure transparency and compliance with the tax-exempt status of the organization.

Form 990 covers detailed financial information, including revenue, expenditures, and compensation for key employees. It also includes disclosures about the organization's mission, programs, and overall impact, which are vital for keeping stakeholders informed about the organization’s operations and compliance with relevant tax-deductible contributions.

In contrast, Form 990-PF is exclusively for private foundations and is not applicable to public charities. Form 990-N, often referred to as the e-Postcard, is a simplified filing option for smaller organizations with gross receipts normally under a specific threshold; this is also not suitable for most § 501(c)(3) organizations which may exceed that limit. Lastly, Form 1023 is the application for tax-exempt status and is not an annual information return. It serves a different purpose entirely and is filed when an entity seeks recognition as a tax-exempt non