This form is for general instructions that apply to all corporation tax forms. It includes a variety of topics about how to fill out your form.Partnerships must file Form CT-2658 to make estimated tax payments on behalf of partners that are C corporations. You must give Form NJ-W4 to your employees to fill out and return to you. This form tells you how to withhold tax from your employee's pay. Withholding Tax Forms for 2017 Filing Season (Tax Year 2016) (Please note the Office of Tax and Revenue is no longer producing and mailing booklets. Pennsylvania law requires withholding at a rate of 3.07 percent on non-wage Pennsylvania source income payments made to nonresidents.