Clear Money Guide
What this state guide covers
A quick view of the questions, practical details and source notes below.
Updated July 28, 2026. Quick answer: Partly, and it depends on your age and how much of the cap your other retirement income already uses. New Jersey offers a retirement-income exclusion that is limited — by age, by a dollar cap, or both — so a conversion can be sheltered up to a point and taxed above it.
The same question for annuity payments: does New Jersey tax annuity income.
The same question for military retired pay: does New Jersey tax military retirement.
The same question for gains from selling investments: does New Jersey tax capital gains.
The same question for ordinary 401(k) and IRA withdrawals: does New Jersey tax 401(k) and IRA withdrawals.
Confidence note: the rule is well established; the answer for you depends on your age and your other retirement income in the conversion year.
The rule in the source’s own words. New Jersey Division of Taxation, Retirement Income Exclusions: “If your total income is $100,000 or less, you can exclude reported taxable pension, annuity, and IRA withdrawals up to the maximum amount” (source, read October 5, 2026).
Why a conversion is a different question from a withdrawal
Almost every state summary answers “how does New Jersey 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.
This is the most consequential case for planning, because the answer is a number rather than a yes or no. A capped exclusion means a conversion is not simply taxed or not taxed — it is taxed above the line where your other retirement income has already consumed the cap.
Two practical consequences. Converting in a year with less other retirement income leaves more of the cap available. And if the exclusion is age-gated, converting before you reach the gate can be markedly more expensive than converting after it — which is a timing decision, not a tax rate.
What New Jersey does with the converted amount
State income tax: graduated, 1.4% to 10.75% top rate
How New Jersey treats IRA and plan income: Taxable, but age 62+ (or disabled) pension/retirement income exclusion: full exclusion up to $100,000 MFJ / $75,000 single / $50,000 MFS when total NJ income is $100,000 or less. for income $100,001-$125,000, 50%/37.5%/25% of pension income excludable (MFJ/single/MFS); $125,001-$150,000, 25%/18.75%/12.5%; NO exclusion once income exceeds $150,000 (hard cliff at $150,001).
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How our partner relationships workWhat to ask a preparer about New Jersey
How much of my exclusion will other retirement income already consume in the year I convert, and does my age at conversion change it?
Converting around a move
Converting in the year you move into New Jersey 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 New Jersey 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 the 2025 NJ-1040 instruction booklet, the NJ Division of Taxation Retirement Income Exclusions page and NJ Income Tax Rates page (nj.gov) on September 30, 2026; the N.J.S.A. statute section citations and GIT-1&2 were not re-checked.
Sources
Authority: N.J.S.A. 54A:6-2 (Social Security); N.J.S.A. 54A:6-10 and 54A:6-15 (pension/other retirement income exclusions); N.J.S.A. 54A:6-26 (military pensions); NJ Division of Taxation GIT-1&2 / njit7; N.J.S.A. 54:34-1; N.J.S.A. 54:34-2.
Compiled from state statutes, session laws and revenue-department publications and adversarially verified in July 2026. Dataset confidence for New Jersey: 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.
For your own numbers, run the Roth Conversion State Tax Calculator: What Your State Adds, and What Lands in the Roth.