The Internal Revenue Service is the revenue service of the United States federal government, which is responsible for collecting taxes and administering the Internal Revenue Code.
The US Department of Labor is responsible for occupational safety and health, wage and hour standards, unemployment benefits, reemployment services and occasionally economic statistics. You can use this site for information regarding the Fair Labor Standards Act (FLSA) and the Family and Medical Leave Act (FMLA).
The United States Social Security Administration is an independent agency of the U.S. federal government that administers Social Security, a social insurance program consisting of retirement, disability and survivor benefits.
The American Payroll Association is a professional association for individuals responsible for processing company payrolls. The Association conducts payroll training courses and seminars on a yearly basis and publishes a library of payroll resource texts and newsletters.