This legal research guide includes links to the United States Code, IRS publications on taxation, tax websites for all 50 states and the District of Columbia, general purpose tax websites, and resources for tax professionals.
United States Code
The text of the United States Code (U.S.C.) is available online in several locations. Title 26 of the U.S.C. is the Internal Revenue Code.
Tax Regulations and Related Materials
- Tax Code, Regulations, and Official Guidance - Includes links to the Code of Federal Regulations, the Federal Register, and the United States Code. Provided by the Internal Revenue Service (IRS).
- Code of Federal Regulations (CFR) - Provides current and archival versions of the CFR. See Title 26 for Internal Revenue. From the Government Publishing Office (GPO).
- Electronic Code of Federal Regulations (eCFR) - eCFR is a compilation of CFR material and Federal Register amendments. See Title 26 for Internal Revenue. From the U.S. GPO.
- United States Tax Court - Includes court rules, fees, forms, and opinions.
Internal Revenue Service Resources
- Resources for Tax Professionals
- Advance Notice for Tax Professionals - Links to rulings, and other technical tax guidance that has not yet been published in the Internal Revenue Bulletin (IRB).
- IRS Charity Search - Replaces the no-longer published Publication 78: Cumulative List of Organizations Described in Section 170(c) of the Internal Revenue Code.
- Newsroom - Select e-News Subscriptions to sign up for email alert services from the IRS. Subscribers will be notified by e-mail of new developments or publications. Also includes links for What's Hot, news releases, IRS-The Basics, and IRS Guidance.
- Forms & Instructions - Includes tax forms for current and prior years, instructional ebooks, and publications inaccessible formats, from Braille-ready files to ASL videos.
- Internal Revenue Bulletin - Available beginning with Cumulative Bulletin 1995-02.
- Tax Information for Businesses - Guides contain examination techniques, common and unique industry issues, business practices, industry terminology and other information.
- IRS Written Determinations - Taxpayer-specific determinations are written memoranda furnished by the IRS National Office in response to requests by taxpayers under published annual guidelines. Includes technical advice memoranda (TAM) and chief counsel advice.
- Understanding Taxes - An instructional website from the IRS. Includes resources for teachers and students. Based on 2014 tax law.
Other Tax Regulation Resources and Related Materials
- TAXTIPS4U - Extensive information for taxpayers. Provided by the American Bar Association.
- Department of the Treasury Press Center - Press releases by date and topic. Good place to look for recently issued documents from the IRS (for example, new IRS notices) that are not yet available in the Internal Revenue Bulletin online.
- United States Congress Joint Committee on Taxation Blue Books - Text of committee prints.
- Tax and Accounting Sites Directory - An extensive collection of tax sites arranged by topic, jurisdiction, and type of tax information. Also includes links to applicable IRS publications.
- Tax World - Provided links to tax information from state, federal, and international taxing authorities on the Internet. Also includes information on tax policy, history, and links to tax databases around the world.
All of the following sites contain extensive information for the researcher, including but not limited to, forms, publications, regulation, laws, revenue rulings and procedures, taxpayer assistance, and information organized by type of tax.
Illinois Tax Sites
- Illinois Department of Revenue
- Laws/Regulations/Rulings - Includes regulations, proposed regulations, letter rulings, general information letters (GIL) and private letter rulings, Practitioners' Questions and Answers, and administrative hearing decisions arranged by tax type.
- Illinois Tax Forms
- Publications - Includes Sales Tax Rate Reference Manual, Illinois Tax Publications, and Informational Bulletins.
- Local Governments - Includes notifications of tax rate changes, statistics, forms, and distribution information.
- Illinois Property Tax Rate and Levy Manual (PDF)
- Illinois Tax Rate Finder - Find tax rates in cities and municipalities across the state.
- Illinois General Assembly Legislative Research Unit Publications - Includes the Illinoist Tax Handbook for Legislators, an annual publication that provides information on every significant Illinois state tax.
Cook County and Chicago Tax Sites
- Cook County Department of Revenue - Links to ordinances and forms. Arranged by type of tax.
- City of Chicago Department of Finance, Tax Division - License and tax information, forms and instructions.
Other State Tax Sites
State Tax Compilations
- Federation of Tax Administrators - Links to federal and state tax sites, state comparisons, technology/e-filing, and motor fuel tax information.
- State and Local Tax (Tax and Accounting Sites Directory) - Links for individual states and other tax compilations.
Treaties and Agreements
- Income Tax Treaties - From the United States Internal Revenue Service (IRS). Texts of treaty with technical explanation if available.
- Information on the United States-Canada Income Tax Treaty (PDF) - IRS Publication 597.
- Social Security Office of International Programs - The text of has bilateral Social Security agreements between the United States and 26 foreign countries. Also includes information on payment of Social Security benefits while residing outside the United States, nonresident alien tax withholding, and social security programs in other countries.
Foreign Tax Sites
- International Tax - Compilation of foreign tax sites from the Tax and Accounting Sites Directory.
- HM Revenue & Customs (HMRC)
- GOV.UK - The entry point to UK public sector information on the Internet.
International and Foreign Tax Reference Materials
- CNNMoney: World Currencies - Foreign currency converter and foreign exchange rates.
- INTER-LAWYER Taxation Law Research Section - Links for international organizations, foreign tax departments, and resources and glossaries.
- XE Currency Converter - Live mid-market exchange rates for various currencies.
- Oanda Currency Converter - Current and historical currency exchange rates dating back to 1990.
The web sites listed in this guide are for information only and are not endorsed or supported by the Cook County Law Library.
Please independently verify the accuracy and currency of all information. Consult an attorney for legal advice.
Compiled by Jean M. Wenger.
Revised February 2019 by David Sanborne.