The Internal Revenue Service said it screened more than just Tea Party and conservative groups who were looking for tax exempt status.
The agency also checked liberal groups who used words like "progressive" and "occupy."
One conservative group complained the IRS was holding up their applications, but a survey by McClatchy News Service found that no liberal groups had complained.
The IRS had said the screenings stopped in May 2012. They now admit those screenings continued until earlier this month.
According to the Associated Press, new IRS Chief Danny Werfel told reporters his agency's screening of groups seeking tax-exempt status was broader and lasted longer than had been previously disclosed.
Werfel said that after he became acting IRS chief in May and discovered "inappropriate criteria that was in use," he immediately ordered the practice to cease.