Gov (search: IT-2104-I) or scan the QR code below. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay.Give Form W-4 to your employer. Withholding tax accurately is the legal responsibility of the issuing company. Use this tool to estimate the federal income tax you want your employer to withhold from your paycheck. This is tax withholding. The mission of the Collin Central Appraisal District is to appraise all property in the Collin County Appraisal District at market value equally and uniformly. To accurately determine the correct amount of Massachusetts withholding, employers will rely on Massachusetts Form M-4.