In 2004, tax examiners, revenue agents, and collectors held about 76,000
jobs at all levels of government. About half worked for the Federal
Government, 3 out of 10 for State governments, and the remainder in local
governments. Among those employed by the IRS, tax examiners and revenue
agents predominate because of the need to examine or audit tax returns.
Collectors make up a smaller proportion, because most disputed tax
liabilities do not require enforced collection.
Source: Bureau of Labor
Statistics, U.S. Department of Labor, Occupational Outlook
Handbook, 2006-07 Edition