Tax Forms 2025

Iowa Withholding Form (IA W-4; English, Spanish)

The Iowa State Tax Withholding Form (IA W-4) has been updated for the 2025 tax year. The latest version is now available in OB365.
Key Update:

  • New Validation for Personal Allowances (Line 1): The updated form now includes validation for the number of Personal Allowances entered on Line 1. This may impact downstream systems that rely on this data for processing.

Customers should review their workflows to ensure compatibility with the updated validation requirements.

Click here for release calendar details.

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