Code of Federal Regulations Code of Federal RegulationsTitle 26 Internal Revenue Digital Daily WelcomeIRS The Digital Daily Forms And PublicationsIRS IRS Forms and Publications Internal Revenue BulletinsIRS The Internal Revenue Bulletin (IRB) is the authoritative instrument of the IRS for announcing all substantive ruling necessary to promote a uniform application of tax law Recent Tax Developments Recent Tax Developments Tax RegulationsIRS IRS Plain Language Regulations U.S. Code The U.S. House of Representatives Internet Law Library U.S. Code (searchable)