The Internal Revenue Service (IRS) continued to make progress in addressing information security control weaknesses and improving its internal control over financial reporting; however, weaknesses remain that could affect the confidentiality, integrity, and availability of financial and sensitive taxpayer data. During fiscal year 2013, IRS management devoted attention and resources to addressing information security controls, and resolved a number of the information security control deficiencies that were previously reported by GAO. This book discusses weaknesses that place financial and taxpayer data at risk. It also examines the growing imbalance between the demand for services and resources; the IRS ability to improve examinations by adopting certain research program practices; and long-term strategy needed to improve interactive services.