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The Internal Revenue Service (IRS) administers and enforces U.S. federal tax laws.

In smaller companies, the IR function is often outsourced to independent investor relations firms. Investor relations is considered a specialty of public relations by the U.S. Department of Labor.

Looking for online definition of IR or what IR stands for? IR is listed in the World's most authoritative dictionary of abbreviations and acronyms.

Looking for the definition of IR? Find out what is the full meaning of IR on Abbreviations.com! 'Infrared' is one option -- get in to view more @ The Web's largest and most authoritative …

What does IR stand for? IR abbreviation. Define IR at AcronymFinder.com.

IR definition: 1. the Inland Revenue 2. → investor relations. Learn more.

The meaning of IR is iridium.

Find out what it takes to become a successful IR professional, from the skills you'll use to the typical day and compensation you can expect.

Dec 10, 2025 · Find e-Services tools for tax professionals, reporting agents, the mortgage industry, payers and others to complete IRS online transactions.