Internal Revenue Service

Irs.gov has 30 URLs listed in 19 Dmoz categories.

IRS
The U.S. government agency responsible for tax collection and tax law enforcement. Includes income tax forms, instructions, and agency publications.
http://www.irs.gov/
Top/Society/Law/Legal_Information/Tax

US Federal Tax Information for Fraternal Societies
From the US Department of the Treasury. Exemption requirements, application, and filing details; also unrelated business and solicitation information.
http://www.irs.gov/charities/index.html
Top/Society/Organizations/Fraternal

IRS: Charities and Non-Profits
Tax-related guidance for nonprofit organizations.
http://www.irs.gov/charities/
Top/Society/Organizations/Nonprofit_Resources/Regional/United_States

IRS
Página oficial del Departamento de Tesorería de los Estados Unidos de América. Contiene información sobre la entidad, impuestos, exenciones y planes de retiro.
http://www.irs.gov/espanol/
Top/World/Español/Regional/América/Estados_Unidos/Gobierno