The 2025 Iowa Individual Income Tax Return (Form IA 1040) is the primary form used by Iowa residents, part-year residents, and nonresidents who are required to file an Iowa individual income tax return. The 2025 IA 1040 Expanded Instructions provide guidance for completing Form IA 1040, including filing requirements, residency rules, income reporting, Iowa additions and subtractions, tax calculations, credits, payments, refunds, and other Iowa-specific tax provisions.
What's Included in the 2025 IA 1040 Instructions
- Filing Requirements: Explains who must file an Iowa income tax return based on residency status, filing status, age, income, and Iowa-source income.
- Filing Status: Provides guidance for the Iowa filing statuses and special filing rules for married taxpayers, part-year residents, and nonresidents.
- Residency Rules: Defines Iowa residents, part-year residents, and nonresidents and explains how Iowa taxes each category of taxpayer.
- Income Reporting: Explains how to report income and determine Iowa taxable income, including Iowa-specific additions and subtractions to federal taxable income.
- Iowa Additions and Subtractions: Provides instructions for reporting Iowa additions and subtractions, including adjustments for certain interest income, retirement income, Social Security benefits, and other items allowed under Iowa law.
- Tax Computation: Explains how to calculate Iowa income tax and determine the tax liability. Part-year residents and nonresidents may also be required to complete Form IA 126, Nonresident and Part-Year Resident Credit.
- Tax Credits: Provides information on Iowa refundable and nonrefundable tax credits. Eligible credits are generally claimed using the appropriate Iowa credit forms and reported on the IA 148 Tax Credits Schedule, when applicable.
- Payments and Refunds: Explains Iowa income tax withholding, estimated tax payments, extension payments, refund options, and the application of overpayments to the following tax year.
Other Iowa Tax Provisions
Includes guidance on:
- Use tax
- Amended returns
- Filing extensions
- Estimated tax requirements
- Special rules for military personnel, Native Americans, and other taxpayers
Forms
The Iowa Department of Revenue provides the following forms and schedules for individual income tax filing:
- Form IA 1040 – Iowa Individual Income Tax Return
- IA 1040 Expanded Instructions
- IA 1040 Schedule 1 – Iowa Additions and Subtractions
- Form IA 126 – Nonresident and Part-Year Resident Credit
- IA 148 – Tax Credits Schedule
- Other schedules and forms, as applicable
Source:
Instruction Download
2025 Iowa IA 1040 Expanded Instructions (PDF):
https://revenue.iowa.gov/media/4435/download?
State Forms Page
Iowa Department of Revenue – Forms:
https://revenue.iowa.gov/forms
Disclaimer: Always verify details with the official Federal or State Department of Revenue Forms and Instructions. For complex tax situations, consult a CPA or tax attorney.