The IRS Has a Nationwide Organization of Approximately 2,000 Taxpayer Advocates to Help U.S. Individual and Business Taxpayers Resolve Problems.   Here's How It Can Help Advisors and Your Clients.  Nina E. Olson is the IRS’s National Taxpayer Advocate. Since 2001, she has led the Taxpayer Advocate Service (TAS), a nationwide organization of approximately 2,000 taxpayer advocates who help U.S. individual and ...