IRS & State Resources

IRS Circular E: This publication explains your tax responsibilities as an employer.
http://www.irs.gov/uac/Publication-15-%28Circular-E%29,-Employer%27s-Tax-Guide

Publication 15-A, Employer's Supplemental Tax Guide: It contains specialized and detailed employment tax information supplementing the basic information provided in Publication 15 (Circular E).
http://www.irs.gov/uac/Publication-15-A,-Employer%27s-Supplemental-Tax-Guide

Publication 15-B, Employer's Tax Guide to Fringe Benefits: It contains information for employers on the employment tax treatment of fringe benefits.
http://www.irs.gov/uac/Publication-15-B,-Employer%27s-Tax-Guide-to-Fringe-Benefits

Colorado Department of Labor: Labor Laws
https://www.colorado.gov/pacific/cdle/node/19326

Colorado Department of Revenue: wage withholding
https://www.colorado.gov/pacific/tax/wage-withholding-payroll-tax-quick-answers

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