Taxpayers contact the Internal Revenue Service via phone, mail or by walking into one of its local offices, notes the official government website, The IRS maintains an electronic mailbox for reports of identity ... More » Business & Finance Taxes

The phone number for the Internal Revenue Service is 1-800-829-1040. This is the toll-free number for individual taxpayers. Tax professionals must use 1-866-255-0654 instead. For those outside of the United States, the n... More » Business & Finance Taxes

As of 2015, the Internal Revenue Service provides live assistance for individuals at 800-829-1040 from 7 a.m. to 7 p.m. local time Monday through Friday, according to the official IRS website. Businesses can receive assi... More » Business & Finance Taxes Income Tax
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The Internal Revenue Service publishes its telephone assistance number for businesses, along with contract information for individuals, exempt organizations, retirement plan administrators and government entities, on IRS... More » Business & Finance Taxes

Taxpayers can contact the Internal Revenue Service through the mail via a number of addresses found on the IRS contact page of the agency's website, where updated addresses are posted for local and federal branch offices... More » Business & Finance Taxes Income Tax

The IRS customer service phone number can be found on the Internal Revenue Service website by clicking on the Contact Your Local IRS Office link, then clicking on the Phone hyperlink under Taxpayer Assistance Centers. Th... More » Business & Finance Taxes

A W-9 tax form is obtainable online and by mail from the Internal Revenue Service, from IRS Taxpayer Assistance Centers and from various community centers, such as libraries and post offices, explains the IRS. As these f... More » Business & Finance Taxes