Withholding returns must be filed electronically for taxable years beginning from and after December 31, 2019. W4 Federal Tax Form Employee's Withholding Certificate.Sign into your HCM account, select the "Payroll" tile, then open the "Tax Withholding" tile. Select the Tax Withholding Form you want to download and update. Find IRS forms, instructions and other publications. Our libraries do not have hard copies of tax forms or instruction booklets. Located in Pinal County, just south of Phoenix, Maricopa offers a unique blend of small-town charm, community spirit, and urban development. If you are working at another location with Maricopa Community Colleges, please fill out the section below. College and Department. Our office is one of the largest prosecutorial agencies in the nation.