501(c)(4)
A tax-exempt classification for social welfare organizations that may engage in political activities, but donations are not tax-deductible.
501(c)(4) is a term from U.S. nonprofit financial reporting — typically a line item or schedule on IRS Form 990, the annual disclosure tax-exempt organizations file. The definition here is the IRS-file usage, which can differ from how the term is used in general financial writing or accounting standards. On the LakeQuality nonprofit efficiency rubric, 501(c)(4) feeds into one of the four scoring factors (program ratio, revenue growth, reserves, or CEO compensation). Understanding how the term is computed at IRS is part of reading nonprofit pages defensibly.
Each nonprofit page on the site surfaces the specific 501(c)(4) value for that organization (when Form 990 reports one), so the general definition here translates into a concrete data point on the per-nonprofit pages you actually use.
Section 501(c)(4) organizations are civic leagues and social welfare organizations that operate primarily for the promotion of the common good and general welfare of the community. Unlike 501(c)(3) charities, 501(c)(4) organizations may engage in substantial lobbying and limited political campaign activities, making them popular vehicles for advocacy and issue-oriented campaigns. However, this flexibility comes with a significant trade-off: donations to 501(c)(4) organizations are generally not tax-deductible for the donor. Well-known 501(c)(4) organizations include the National Rifle Association, the Sierra Club, the AARP, and various political advocacy groups across the ideological spectrum. The classification gained public attention during the 2010s when the IRS was found to be scrutinizing applications from politically oriented groups more heavily. To qualify, the organization must be operated exclusively for social welfare purposes, though "exclusively" has been interpreted by the IRS to mean "primarily." The organization must still file Form 990 annually, and its financial data is publicly available. Donors should understand that giving to a 501(c)(4) does not provide the same tax benefit as giving to a 501(c)(3) charity, which can affect the effective cost of their contribution.