Download a blank, fillable Wt-4a Wisconsin Employee Withholding Agreement form in PDF format by simply clicking the “DOWNLOAD PDF” button. NOTE: We are required to collect IL-W-4 for all IL reports and holdbacks. Note: Employees are taxable in Wisconsin, so the withholding is the same as if they were established in Wisconsin. Employees may submit updated withholding tax information throughout their employment for federal and/or national purposes. Once departments have received this W-4, the employee`s information should be updated accordingly. To update the W-4 (Employee`s Withholding Allowance Certificate) order form in HRS (Existing Hire): Some fillable PDF files have the option to immediately store or send the completed form containing your own data for later use. Open the file in any PDF display software. Adobe Reader or any other alternative for Windows or MacOS are required to access and complete the fillable content….