Iowa state income tax — ITIN filer guide

Iowa taxes income at a flat 3.8% (tax year 2026), administered by the Iowa Department of Revenue. This guide covers who must file, how filing with an ITIN works, whether the state EITC applies to you, and when refunds arrive.

FLAT rate: 3.8%

  • State return form: IA 1040
  • Deadline (tax year 2026): April 30, 2027 (Iowa's deadline is April 30, not April 15)
  • Who must file: Residents under 65 must file if net income exceeds $9,000 (single) or $13,500 (married filing jointly) (TY2025)
  • State sales tax: 6%
  • Scheduled change: Converted from graduated brackets to a 3.8% flat tax effective TY2025; no further legislated change for 2026/2027

Iowa refund timing

  • E-filed returns: Iowa DOR: anticipated refund processing time frame is 30 days
  • Paper returns: Iowa DOR: 30-day anticipated time frame; paper returns process slower than e-filed
  • Check your Iowa refund status

State tax agency

  • Iowa Department of Revenue — revenue.iowa.gov
  • Phone: 515-281-3114 or 1-800-367-3388
  • Free filing option: No state-run return portal (GovConnectIowa does not file individual income returns) — free vendor offers via the DOR 'File for FREE' page (e.g., AGI <= $32,000)

Facts verified 2026-06-11 against official state sources (primary source). Figures refresh with every dataset review.

Filing with an ITIN

Your ITIN is fully accepted on the Iowa state return — states accept the IRS-issued taxpayer number, the same one you use federally. The flow is always the same:

  1. Complete your federal return first (Form 1040 + ITIN)
  2. Transfer your federal figures to IA 1040
  3. Apply state-specific deductions and credits
  4. E-file — No state-run return portal (GovConnectIowa does not file individual income returns) — free vendor offers via the DOR ‘File for FREE’ page (e.g., AGI <= $32,000)
  5. Or visit a VITA site for free in-person preparation

Iowa state EITC — do ITIN filers qualify?

The federal EITC requires valid SSNs for you, your spouse, and qualifying children — ITIN filers can never claim it. What varies is the STATE credit:

Iowa Earned Income Tax Credit — 15% of the federal EITC (refundable)

✗ SSN required (not available to ITIN filers)

Iowa DOR: credit 'is available only to taxpayers who qualify for the federal EITC' — federal SSN requirement therefore excludes ITIN-only filers

See how all 52 jurisdictions compare on the state tax hub and which tax credits ITIN filers can claim.

Last verified: 2026-06-11. Primary source: Iowa Department of Revenue.

General procedural information for educational purposes. Not legal or tax advice. State tax rates change frequently — verify current figures with the state agency before filing. For case-specific guidance, consult a tax professional, enrolled agent, or CPA.