Four primary IRS Divisions at-a-glance: Wage and Investment Large Business and International Small Business/Self-Employed Tax-Exempt and Government Entities Other principal offices: Office of Chief Counsel Taxpayer Advocate Service Criminal Investigation Appeals Return Preparer Office Office of Professional Responsibility (OPR) Communications and Liaison Whistleblower Office Privacy, Governmental Liaison and Disclosure Equity, Diversity and Inclusion Procurement
