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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.
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Premier Payroll Research Library: Fringe Benefits
This article has the employer realize the importance of reporting fringe benefits to the IRS. This explains what fringe benefits are. Lists certain benefits that may be excluded from income as well as others which may not be excluded.