A flat 3.8%, no local income tax, and a property bill that does the work

Step-by-step

1. 1

   Complete both the federal W-4 and the Iowa IA W-4 on day one

   Iowa has its own withholding certificate, separate from the federal one. Getting it wrong is the commonest reason a first Iowa return produces an unexpected bill. There is no city or county form on top, because no Iowa municipality levies an income tax.

   Via employerWho: YouFirst week of employment
2. 2

   Determine your US tax residency

   The substantial presence test counts weighted days across three years to decide whether the US taxes your worldwide income or only US-source income. Your visa category does not decide this, and the arithmetic surprises people who split time between countries.

   OnlineWho: You
3. 3

   Check for an applicable federal tax treaty

   The US has treaties with around 70 countries that can reduce or exempt tax on particular income. Iowa's starting point for its own calculation follows the federal return closely, so a treaty position generally flows through — but confirm rather than assume.

   OnlineWho: You
4. 4

   If you commute from Illinois, file the reciprocity form

   Iowa's only income-tax reciprocity agreement is with Illinois. An Iowa resident working in Illinois files Illinois form IL-W-5-NR with the employer; an Illinois resident working in Iowa files the Iowa Employee's Statement of Nonresidence in Iowa (form 44-016). It covers wages and salaries only — gambling winnings, unemployment compensation and other Iowa-source income remain taxable to Iowa.

   Via employerWho: You
5. 5

   If you buy, file for the homestead exemption with the county assessor

   Senate File 2472, signed 18 May 2026, replaced Iowa's homestead credit with an exemption worth 10% of taxable value, minimum $5,500 and maximum $20,000, plus a further $6,500 for owners aged 65 and over. It applies from assessment year 2026, first felt in the bills paid September 2027 and March 2028. Anyone holding the old credit before 1 July 2026 is converted automatically; a new buyer must file.

   OnlineWho: You
6. 6

   Read the assessment notice — Iowa property tax is the real burden

   With income tax now flat at 3.8% and no local income tax, property tax is where Iowa raises its money, and Polk County rates are high by national standards. Renters pay it through the rent. Assessment notices carry an appeal window; it is short, fixed and free to use.

   OnlineWho: YouSpring, by the appeal deadline
7. 7

   Budget 7% sales tax in the city

   Iowa's state rate has been 6% since 1 July 2008, with a local option of up to 1% on top; Des Moines levies it, so purchases in the city are taxed at 7%. The rate changes at some suburban boundaries, so a large purchase is occasionally worth making in a different jurisdiction.

   OnlineWho: You
8. 8

   File federal and Iowa returns

   The federal return is due 15 April; Iowa's individual return deadline sits later in the spring, so check the year's date rather than assuming they coincide. If you are 55 or older, note that Iowa has excluded most retirement income — IRAs, 401(k)s, pensions and IPERS — from state tax since tax year 2023 under House File 2317.

   OnlineWho: YouAnnually in spring
9. 9

   File an FBAR if foreign accounts exceed $10,000

   Aggregate foreign account balances over $10,000 at any point in the year trigger a FinCEN filing, separate from your tax return and with its own penalties.

   OnlineWho: You