There are a variety of 800 numbers for departments within the Internal Revenue Service, notes the IRS. The e-help Desk provides assistance with issues pertaining to electronic tax return filing, and the toll-free number is 866-255-0654, as of 2015. The 800 number for taxpayers with hearing impairments is 800-829-4059.
Most of the 800 numbers within the IRS are staffed from 7 a.m. to 7 p.m, local time, Monday through Friday, says the IRS. Taxpayers needing assistance with retirement plans or government entity taxes can call a designated 800 number between the hours of 8 a.m. to 5 p.m., local time. Taxpayers can obtain help over the phone with a variety of issues, including filing taxes or inquiring about a notice received.