Religious, Grantmaking, Civic, Professional, & Similar Organizations

Religious, grantmaking, civic, professional, and similar organizations (NAICS 813) covers tax-exempt entities including churches and religious congregations, private foundations, civic associations, labor unions, professional membership organizations, and political organizations. The IRS recognizes over 1.5 million 501(c) organizations in the United States, with religious organizations (501(c)(3)) and charitable nonprofits forming the largest categories. The Bill & Melinda Gates Foundation, the Ford Foundation, and the Lilly Endowment rank among the largest private foundations by assets, while the United Way and Salvation Army are among the highest-revenue charitable organizations.

Labor unions — organized under 501(c)(5) — include the AFL-CIO federation, SEIU (the largest healthcare union), and the UAW, which negotiated landmark contracts with Detroit automakers in 2023 that set pattern-bargaining precedents across manufacturing. Professional associations range from the American Medical Association and American Bar Association to industry-specific groups like the National Association of Realtors (NAR), whose membership structure and MLS access rules are currently subject to antitrust litigation resulting in a $418 million settlement in 2024.

The subsector operates under IRC Section 501(c) tax exemption, with each designation (501(c)(3) charitable, 501(c)(4) social welfare, 501(c)(5) labor, 501(c)(6) business leagues) carrying distinct rules on lobbying, political activity, and donor tax deductibility. IRS Form 990 filing requirements provide public transparency for organizations above $50,000 in gross receipts. State-level charitable solicitation registration — required in roughly 40 states — adds compliance complexity for organizations fundraising nationally. The Johnson Amendment prohibits 501(c)(3) organizations from endorsing political candidates, a provision that has faced periodic repeal efforts in Congress.