Clear Money Guide
What this state guide covers
A quick view of the questions, practical details and source notes below.
Updated August 12, 2026. Quick answer: Partly — and for most converters, no. Iowa’s Department of Revenue lists “Roth conversion income” by name among the income that qualifies for the retirement income exclusion, and that exclusion has no dollar cap. If you are 55 or older on December 31 (or disabled, or an eligible survivor), Iowa does not tax the conversion at all; under 55 it is taxed at the flat 3.8%.
Confidence note: high. The Iowa Department of Revenue’s retirement income guidance names Roth conversion income explicitly, which is unusually direct for this question.
Why a conversion is a different question from a withdrawal
Almost every state summary answers “how does Iowa tax retirement income?” That is a question about distributions. A Roth conversion is not a distribution in the ordinary sense — it is a voluntary election to recognise income now in exchange for tax-free growth later. Whether a state’s retirement exclusion reaches that election is a separate question, and it is the one that decides your bill.
Iowa is one of the few states that answers this question outright rather than leaving you to infer it. The exclusion is not capped, so above the age gate the conversion has no state cost at all — the whole question is which side of 55 you are on at the end of the year.
The planning consequence is a single date. Converting in the year you turn 55 rather than the year before can take the entire Iowa bill to zero, and it is your age on December 31 that counts, not your age on the day of the conversion.
What Iowa does with the converted amount
State income tax: flat 3.8% (SF 2442, effective TY2025; unchanged 2026)
How Iowa treats IRA and plan income: Fully exempt for taxpayers 55+ (also disabled taxpayers and eligible survivors): pensions (public and private, including defined benefit and defined contribution plans), annuities, individual retirement accounts, employer-maintained plans and deferred compensation (Iowa Code §422.7(19)(a)). IPERS), 401(k)/403(b)/457, traditional IRA distributions, annuities — no dollar cap (HF 2317, effective TY2023; Iowa Code § 422.7). Under 55 (non-disabled): taxable at 3.8%.
What to ask a preparer about Iowa
Will I be 55 on December 31 of the conversion year — and if not, is waiting cheaper than converting now at 3.8%?
The state bill is only half the decision
What a conversion costs depends on the federal bracket it fills as well as the state you are resident in when you make it, and an adviser can price both together before you decide how much to convert.
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Converting around a move
Converting in the year you move into Iowa is the case that catches people. Residency at the moment of conversion is what generally determines which state gets to tax it, so a conversion executed a week before a move and one executed a week after can produce different bills.
Four separate taxes change when you move, not one: income tax on withdrawals, treatment of Social Security, estate tax, and inheritance tax. A state that looks good on conversions can be worse on the other three.
The state bill is the smaller half
Whatever Iowa does, the conversion is federal ordinary income first. The federal bracket you land in, and whether the conversion pushes you over an IRMAA threshold two years later, will usually move more money than the state line does. The state answer tells you whether to convert here; the federal answer tells you how much to convert at once.
Paying the tax from outside the account matters more than either. Using converted dollars to pay the bill shrinks the balance that was the entire point of converting.
Sources
Authority: Iowa Code § 422.7; Iowa DOR: Retirement Income Tax Guidance; HF 2317 (2022); SF 2442 (2024); Iowa Code ch. 450 (repealed by 2021 Iowa Acts, SF 619).
Compiled from state statutes, session laws and revenue-department publications and adversarially verified in July 2026. Dataset confidence for Iowa: high.
This page states what the cited authority says. It is not tax advice, and a conversion large enough to matter is worth putting in front of a preparer who can see your whole return.