Additional withholding amounts To ask your employer to withhold an additional amount each pay period, complete lines 3, 4, and 5 on Form IT-2104, as applicable. 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. S for purposes of either chapter 3 or 4 (whether or not any tax was withheld or was required to be withheld to the extent reporting is required). Adobe Reader may be required for your browser or you may need to download the form to complete it properly. Combined Business Tax Forms.