Internal Revenue Service
Irs: Online Services and Tax Information for Individuals
In a conversational tone, the IRS answers many of the questions an individual would have when filing income tax returns for the first time. Many features are helpful even to experienced taxpayers, e.g., an IRS withholding calculator, a...
Bankrate
Bankrate.com: Taxes
This site explores the basics of taxes including finding your tax bracket, income tax calculator, earned income tax, state taxes, states with no income tax, and capital gains.
Wolters Kluwer
Small Business Guide: What Are Your Self Employment Taxes?
CCH Business Owner's Toolkit answers questions about self-employment taxes because "even if you don't hire anyone else to help you run your business, you're always going to have at least one employee, and that would be yourself."
Other
Uncle Fed's Taxes: Tax Topic 401, Wages and Salaries
This site from Uncle Fed's Tax board explains withholding tax from wages and salaries. Mentions various forms that are used when filing taxes.