On April 14th, the day before tax day, the Senate Finance Committee held a hearing on the tax gap where they discussed compliance issues, tax code complexity, and the amount of revenue that is lost each year due to people and corporations who don't pay 100 percent of their taxes. Witnesses included GAO Comptroller David Walker, IRS Commissioner Mark Everson, Cheif of Staff of the Joint Committee on Taxation George Yin, and National Taxpayer Advocate Nina Olson. All Committee member and witness statements can be read here. Read this Washington Post article for more info on the tax gap and compliance issues, and look for an article in next week's edition of the Watcher for more detailed coverage.