January 14, 2026
The Internal Revenue Service has updated its 2026 Form W-4 and 2026 withholding tables. These updates incorporate changes from the federal One Big Beautiful Bill Act (OBBBA) signed into law in July 2025. The Iowa Department of Revenue has issued new income withholding tables and formulas for 2026 to also reflect the federal changes.
Employees can update their W-4 forms (federal and state) anytime and as often as necessary in Workday. We encourage you to use the state withholding estimator and the IRS tax withholding estimator to calculate your 2026 withholding amounts.
The university is not able to give individual income tax advice. We recommend reviewing your withholding on your payslip on a regular basis and contacting a professional tax advisor for information and assistance with your personal income tax planning and adjusting your W-4 form.
Read more about the changes in Inside Iowa State.