The Treasury Inspector General for Tax Administration yesterday released Higher Than Planned Call Demand Reduced Toll-Free Telephone Access for the 2009 Filing Season (2009-40-127):

During the 2009 Filing Season, 75.7 million total dialed attempts were made to the IRS toll-free telephone lines. Through automation and assistors, the IRS answered 35.8 million (47.3%) calls during normal hours of operation. However, 22.4 million calls were not answered during normal hours of operation because the taxpayers hung up, were courtesy disconnected5 by the IRS, or received a busy signal. IRS officials stated that the 22.4 million calls included calls from taxpayers who called back and received service, dialed the IRS repeatedly, or hung up for reasons outside the IRS’ control. The IRS experienced high call demand during the last two filing seasons. Nevertheless, even when the IRS achieves more than an 80% Level of Service, millions of calls are not answered by IRS assistors.