This form is for general instructions that apply to all corporation tax forms. The employee must send the Form W4 and statement directly to the IRS office designated on the lockin letter.Quick guide to completing Form CT3, General Business Corporation Franchise Tax Return. Corporate tax filing requirements. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. This form tells your employer how much federal income tax withholding to keep from each paycheck. James owns a small business with two employees. Which form will James need to file to report wages, withholding and employment taxes? The 2020 Form W4 has undergone significant changes to more closely align the withholding to the changes in the tax law. Understand the W4 form, its purpose, and how to complete it accurately to ensure correct federal income tax withholding from your paycheck.