Clear Money Guide
What this state guide covers
A quick view of the questions, practical details and source notes below.
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Updated July 28, 2026. Quick answer: Yes. Idaho taxes IRA and plan distributions in full with no general retirement exclusion, so a Roth conversion is taxed as ordinary income at the state rate on top of your federal bill.
The same question for annuity payments: does Idaho tax annuity income.
The same question for military retired pay: does Idaho tax military retirement.
The same question for gains from selling investments: does Idaho tax capital gains.
The same question for ordinary 401(k) and IRA withdrawals: does Idaho tax 401(k) and IRA withdrawals.
Why a conversion is a different question from a withdrawal
Almost every state summary answers “how does Idaho 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.
There is no exclusion to argue about here, which at least makes the maths clean: the converted amount is added to Idaho taxable income in the conversion year.
Because the state cost is certain, the lever that matters in Idaho is when and how much — splitting a conversion across tax years, or converting in a year of unusually low income, changes the bill in a way that arguing about the exclusion cannot.
What Idaho does with the converted amount
State income tax: flat 5.3% (cut from 5.695% by HB 40, 2025)
How Idaho treats IRA and plan income: Pensions, 401(k), and IRA distributions generally fully taxable. Narrow Retirement Benefits Deduction (Idaho Code § 63-3022A) only for: CSRS (not FERS), FSRDS, military retirement, Idaho Firefighters Retirement Fund, and certain Idaho police pensions — requires age 65+ (or 62+ disabled) for the civil service, firefighter and police items, while retired service members qualify if disabled, age 62+, or under 62 and working enough to file a federal return; MFJ must file jointly. 2025 maximums approximately $48,216 single / $72,324 joint, reduced dollar-for-dollar by Social Security/railroad benefits received.
| Conversion | State tax at 5.3% |
|---|---|
| $50,000 | $2,650 |
| $100,000 | $5,300 |
| $250,000 | $13,250 |
Straight arithmetic at the stated rate. It ignores deductions, credits, and any graduated bracket effects, so treat it as the ceiling rather than a filing figure.
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Source: WiserAdvisor’s service descriptionWhat to ask a preparer about Idaho
None on eligibility — it is taxable. Ask instead how splitting the conversion across two tax years changes the bracket outcome.
Converting around a move
Converting in the year you move into Idaho 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 Idaho 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.
Figures verified against Idaho Code sections 63-3022A and 63-3024 and the Idaho State Tax Commission 2025 Form 39R instructions on September 30, 2026.
Sources
Authority: Idaho Code § 63-3022A; Idaho State Tax Commission: Idaho Retirement Benefits Deduction; Form 39R Part B.
Compiled from state statutes, session laws and revenue-department publications and adversarially verified in July 2026. Dataset confidence for Idaho: high on structure; medium on exact 2025 maximum deduction amounts.
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.