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
Website
https://www.irs.govApplication process
Call or visit website
Fees
None for information
Service area
All ZIP Codes, AZ
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
What's Here
Advanced Earned Income Credit InformationEarned Income Credit InformationFederal Child and Dependent Care Tax Credit InformationTax FormsFederal Child Tax Credit InformationFederal Education Tax Credit InformationGeneral Federal Income Tax InformationTaxpayer Information LinesGeneral Business Tax InformationWelfare to Work Tax Credit InformationWork Opportunity Tax Credit InformationState Earned Income Tax Credit Information
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.