Form W-4 for Employers: Rules, Steps and Withholding Basics
Form W-4, the Employee's Withholding Certificate, is the IRS form an employee fills out so you know how much federal income tax to withhold from their pay. As the employer, you collect it at hire, apply it to payroll using the tables in IRS Publication 15-T, keep it on file, and follow special rules when a form is missing, invalid, claims exemption or is overridden by an IRS lock-in letter. This article is general information, not legal advice. Key takeaways Ask every new employee for a signed Form W-4 and make it effective with the first wage payment. If an employee gives you no Form W-4, withhold as if they checked Single or Married filing separately and made no other entries. Exempt status lasts one calendar year; the employee must give you a new form by February 15 to stay exempt. An IRS lock-in letter overrides any later Form W-4 that would lower withholding. Form W-4 covers federal income tax only, so state withholding may need a separate state certificate. What is...