Internal Revenue Service
Irs: Payroll Taxes and Federal Income Tax Withholding Assessment
Answer the following multiple-choice and true/false questions about payroll taxes and federal income tax withholding by clicking on the correct answers. To assess your answers, click the Check My Answers button at the bottom of the page.
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Payroll taxes.com:federal Payroll Tax Forms and Filing Addresses
This site explains the purpose of the W-2 form, special situations that affect it, and where and when to file it.