Help is now provided on a first come-first served basis. The agency said that means taxpayers have to wait in long times, sometimes for more than an hour.

"My hope is that this test increases the level of customer service that we can provide while minimizing needless burden on taxpayers," says IRS Commissioner John Koskinen.

The test begins on February 23 in the following cities: Atlanta, Ga. (Atlanta-Woodstock); Austin, Texas; Birmingham, Ala.; Chicago, Ill. (Dearborn); Denver, Colo.; Fresno, Calif.; Hartford, Conn.; Plantation, Fla.; San Antonio, Texas; and Seattle, Wash.