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Internal Revenue Service | Internal Revenue Service

1111 Constitution Ave NW, Washington, DC 20224-0001

Eligibility

All taxpayers, including small business owners and sole proprietors

Hours

Mon-Fri 7am-7pm local time by phone
800-829-1040

Voice - Toll-Free for Individuals

800-829-4933

Voice - Toll-Free for Businesses

800-829-4059

Voice - Toll-Free TTY

https://www.irs.gov

Application process

Call or visit website

Fees

None for information

Service area

AZ

Description

Federal tax collection agency administers the Internal Revenue Code enacted by Congress. Provides information by phone and online to help people understand and meet their tax responsibilities. Website provides forms which can be downloaded, and information about tax return corrections, penalties and penalty relief, refunds, deductions, and credits (Earned Income Tax Credit, education, child care, adoption, Saver's Credit, Welfare-to-Work, and Work Opportunity Tax Credit). Also provides answers to frequently asked questions for individuals, businesses, and nonprofits.

Last Assured

10/01/2025

Providing organization

Internal Revenue Service

Federal tax collection agency administers the Internal Revenue Code enacted by Congress. Provides information by phone and online to help people understand and meet their tax responsibilities. Website provides forms which can be downloaded, and information about tax return corrections, penalties and penalty relief, refunds, deductions, and credits (Earned Income Tax Credit, education, child care, adoption, Saver's Credit, Welfare-to-Work, and Work Opportunity Tax Credit). Also provides answers to frequently asked questions for individuals, businesses, and nonprofits.