The report describes several new procedures the agency is installing to prevent unfair treatment of taxpayers in the future. They include a fast-track process for groups seeking tax-exempt status that have yet to get a response from the IRS within 120 days of applying.
In addition, the top five people in the agency responsible for the tax-exempt status of organizations have been removed, including the former acting commissioner, Steven Miller, whom President Barack Obama replaced with Werfel.
"The IRS is committed to correcting its mistakes, holding individuals accountable as appropriate" and establishing new controls to reduce potential future problems, Werfel told reporters.
Werfel's comments and report drew negative reviews from one of the IRS's chief critics in Congress, Rep. Darrell Issa, R-Calif., chairman of the House Oversight and Government Reform Committee.
Issa said the review "fails to meaningfully answer the largest outstanding questions about inappropriate inquiries and indefensible delays. As investigations by Congress and the Justice Department are still ongoing, Mr. Werfel's assertion that he has found no evidence that anyone at IRS intentionally did anything wrong can only be called premature."
The IRS has provided congressional committees investigating the agency documents related to the screening problems. He said work was continuing on removing sensitive taxpayer information from those documents, and he said he expects them to be released soon.
Werfel had promised to produce a report within a month of taking over the embattled agency.
Werfel said he briefed Obama and Treasury Secretary Jacob J. Lew on the report earlier Monday.