TAX & LICENSE / FEDERAL TAX SYSTEM
Internal Revenue Service
800-829-1040
https://www.irs.gov/
Dayton IRS Tax Office
200 W. Second Street
Dayton 937-610-2182
https://www.irs.gov/
Frequently Asked Questions
https://www.irs.gov/faqs
Tax Topics
https://www.irs.gov/taxtopics