Roth Conversion in New Jersey
A Roth conversion in New Jersey is taxed as ordinary income in the year you convert, at the state’s graduated Gross Income Tax rates that run from 1.4% up to 10.75% (Source: NJ Division of Taxation, “NJ Income Tax Rates,” 2026). New Jersey is not a state that exempts retirement-plan distributions, so the amount you move to a Roth counts on your New Jersey return the same year.
New Jersey taxes a Roth conversion as ordinary income at graduated rates from 1.4% to 10.75% in the conversion year (Source: NJ Division of Taxation, “NJ Income Tax Rates,” 2026). If you are 62 or older and total gross income stays at or under $150,000, the Retirement Income Exclusion can shelter part or all of the converted amount, but crossing $150,000 forfeits the exclusion entirely.
Does New Jersey tax a Roth conversion?
Yes. New Jersey treats a traditional-to-Roth conversion as taxable Gross Income Tax income in the year of the conversion, taxed at graduated rates up to 10.75% (Source: NJ Division of Taxation, “Retirement Income,” 2026). Only the portion exceeding your previously-taxed New Jersey basis is taxable, and the Retirement Income Exclusion may reduce it if you qualify.
When you convert a traditional IRA or pre-tax 401(k) balance to a Roth, New Jersey adds the taxable amount to your Gross Income Tax return for that year, where it stacks on your other income and is taxed at the marginal rate your total reaches (Source: NJ Division of Taxation, “Retirement Income,” 2026). Unlike Pennsylvania, which generally does not tax qualified retirement-plan distributions after retirement age, New Jersey offers no blanket exemption for conversions. It does give you basis recovery that stops contribution dollars from being taxed twice, plus a Retirement Income Exclusion for people 62 and older, both explained below. For the national picture, see our overview of Roth conversion state taxes.
2026 New Jersey Gross Income Tax rate schedule
New Jersey’s Gross Income Tax has seven marginal brackets for 2026, topping out at 10.75% on income over $1,000,000 (Source: NJ Division of Taxation, “NJ Income Tax Rates,” 2026). A conversion is taxed at the marginal rate your total income reaches, so most New Jersey retirees converting moderate amounts land in the 3.5% to 6.37% range.
| Taxable income (single/MFS) | 2026 marginal rate |
|---|---|
| $0 to $20,000 | 1.4% |
| $20,001 to $35,000 | 1.75% |
| $35,001 to $40,000 | 3.5% |
| $40,001 to $75,000 | 5.525% |
| $75,001 to $500,000 | 6.37% |
| $500,001 to $1,000,000 | 8.97% |
| Over $1,000,000 | 10.75% |
Married/civil-union joint filers and heads of household use a separate schedule at lower income levels, so joint break points differ below roughly $50,000; the 10.75% top rate over $1,000,000 applies across schedules (Source: NJ Division of Taxation, “NJ Income Tax Rate Schedules,” 2026). Because the conversion is taxed on top of everything else, its size and your other income together decide the rate. Our how much to convert to Roth guide covers sizing against a bracket ceiling.
New Jersey IRA basis recovery under GIT-2 and backdoor Roth double taxation
New Jersey never allowed a deduction for traditional IRA contributions, so those already-taxed dollars are New Jersey basis and are not taxed again on conversion (Source: NJ Division of Taxation, GIT-1&2, 2026). Only earnings and rolled-in pre-tax 401(k) money are taxable. This is why your New Jersey taxable conversion amount is often smaller than the figure on your federal 1099-R.
New Jersey taxed many of your traditional IRA contributions when you made them, because the state gave no deduction the way federal law did. Those previously-taxed contributions become your New Jersey basis. When you convert an entire traditional IRA, only the amount above your unrecovered basis is New Jersey taxable income on the conversion. For a partial withdrawal instead of a full conversion, New Jersey does not let you recover all basis first; it applies a proportional calculation (the three-year rule or general rule under GIT-2) that treats part of each distribution as basis and part as taxable (Source: NJ Division of Taxation, GIT-1&2 “Pensions and Annuities,” 2026).
This matters most for a backdoor Roth. A nondeductible contribution is basis both federally and in New Jersey, so copying the taxable figure from your federal return onto the New Jersey return can overstate New Jersey tax by taxing contribution dollars already taxed years ago. Track basis carefully; money rolled in from a pre-tax employer 401(k) generally carries no New Jersey basis and is fully taxable on conversion.
Does NJ tax Roth IRA withdrawals in retirement?
No. Qualified Roth IRA withdrawals are not included in New Jersey Gross Income once the account is qualified, so they are not taxed and do not count toward the Retirement Income Exclusion income tests (Source: NJ Division of Taxation, “Retirement Income,” 2026). You pay New Jersey tax at the conversion, then qualified Roth distributions come out state-tax-free.
The payoff of paying New Jersey tax on a conversion now is that qualified Roth withdrawals later are excluded from New Jersey Gross Income entirely and do not count in the $100,000 and $150,000 tests that govern the Retirement Income Exclusion. A retiree who has shifted assets into a Roth can draw income without pushing gross income toward the exclusion cliff described below. See our Roth conversion break-even analysis for the timing math.
Does New Jersey tax Social Security?
No. Social Security and Railroad Retirement benefits are fully exempt from New Jersey income tax at every income level, and they are not reported on the New Jersey return (Source: NJ Division of Taxation, “Exempt (Nontaxable) Income,” 2026). No thresholds or phase-outs apply, and Social Security does not count toward the New Jersey Retirement Income Exclusion income limits.
The full exclusion shapes conversion timing. Because benefits are not New Jersey income, delaying Social Security while you run conversions in the gap years does not add to your New Jersey gross-income total for the exclusion test. Social Security can still be partly taxable federally, and a large conversion can raise that federal taxability. For that layer, read our note on the taxation of Social Security benefits in 2026.
New Jersey pension exclusion 2026 and the retirement income exclusion income limit
For 2026, New Jersey’s Retirement Income Exclusion lets qualifying taxpayers exclude up to $100,000 (married filing jointly), $75,000 (single or head of household), or $50,000 (married filing separately) of pension, annuity, and IRA/401(k) income. You must be 62 or older or disabled, and total gross income must be $150,000 or less (Source: NJ Division of Taxation, “Retirement Income Exclusions,” 2026).
New Jersey taxes pension, annuity, and traditional IRA/401(k) withdrawals as ordinary income, unlike Pennsylvania or Illinois. To qualify for the exclusion, you (or your spouse on a joint return) must be age 62 or older, or disabled under Social Security rules, on the last day of the tax year, and total gross income must be $150,000 or less. The maximum exclusion then phases down in tiers once gross income passes $100,000 (Source: NJ Division of Taxation, “Retirement Income Exclusions,” 2026):
| Total gross income (2026) | MFJ (max $100,000) | Single / HoH (max $75,000) | MFS (max $50,000) |
|---|---|---|---|
| $100,000 or less | 100% | 100% | 100% |
| $100,001 to $125,000 | 50% | 37.5% | 25% |
| $125,001 to $150,000 | 25% | 18.75% | 12.5% |
| Over $150,000 | 0% (none) | 0% (none) | 0% (none) |
Source: NJ Division of Taxation, “Retirement Income Exclusions,” 2026. Each percentage above is the share of eligible pension, annuity, and IRA/401(k) retirement income that may be excluded, capped at the dollar maximum shown in the column header. A conversion counts as retirement income for this exclusion, so a qualifying converter under the income limits can apply the exclusion against the converted amount itself.
The NJ pension exclusion $100,000 cliff and when to do a Roth conversion in New Jersey
A Roth conversion is counted in New Jersey’s $100,000 and $150,000 gross-income tests in the conversion year. A large conversion can push gross income over $150,000 and zero out the entire Retirement Income Exclusion, a potential five-figure swing on one dollar over the line (Source: NJ Division of Taxation, “Retirement Income Exclusions,” 2026). Whether a conversion keeps gross income under that cliff is the central New Jersey tax variable.
A point many overviews treat separately is that conversion income is itself part of the gross-income figure the exclusion is tested against. Converting too much in one year can forfeit the whole exclusion, so the tax bill can rise by more than the marginal rate on the extra conversion dollars alone. The $150,000 line is a hard cliff: at $150,000 you may keep the 25% tier; at $150,001 the exclusion is $0.
The general New Jersey planning window is the low-income stretch between retirement and the start of Social Security, pensions, and required minimum distributions (federal RMD age is 73, or 75 for those born in 1960 or later), when your baseline gross income is lowest and conversion headroom under the $100,000 and $150,000 tiers is widest. Whether staying under a tier is worthwhile depends on your full picture, including the federal five-year rule and Medicare IRMAA surcharges a large conversion can trigger two years later.
Illustrative New Jersey state tax on a $100,000 Roth conversion
The table below is illustrative only. It shows how a $100,000 conversion for a married couple can produce very different New Jersey outcomes depending on whether the conversion keeps total gross income under the $150,000 exclusion cliff (Source: NJ Division of Taxation, “Retirement Income Exclusions,” 2026). Your actual result depends on your other income, basis, age, and filing status.
| Illustrative scenario (MFJ, both 63) | Scenario A: convert in a high-income year | Scenario B: convert in a low-income year |
|---|---|---|
| Other NJ gross income before conversion | $120,000 | $30,000 |
| Roth conversion added | $100,000 | $100,000 |
| Total NJ gross income | $220,000 | $130,000 |
| Over the $150,000 cliff? | Yes | No |
| Retirement Income Exclusion available | $0 (forfeited) | 25% tier (up to $25,000) |
| Illustrative NJ treatment of the conversion | Fully taxable at marginal rates up to 6.37% | Partly sheltered, remainder taxed at lower marginal rates |
These numbers are simplified, ignore New Jersey basis recovery, and are not a projection of your result or a promise of tax savings. The point is directional: the same $100,000 conversion can land in very different New Jersey tax territory depending on the year you choose and the income already on your return.
Rothology® Premier Roth Conversion
A flat-fee, fiduciary Roth conversion planning service: a multi-year conversion plan and tax projections that account for your state. Educational conversation first; no products sold.
New Jersey estate tax repeal 2018 and inheritance tax in 2026
New Jersey has no estate tax; it was repealed for deaths on or after January 1, 2018 (Source: NJ Division of Taxation, “Inheritance and Estate Tax,” 2026). New Jersey still levies an inheritance tax based on who inherits: spouses, children, and grandchildren are fully exempt (Class A), while siblings and others face rates from 11% up to 16%.
New Jersey has no estate tax in 2026, so the size of your estate alone does not trigger a state death tax. The inheritance tax remains in force and turns on the beneficiary’s relationship to you:
- Class A (spouse or civil-union partner, children, stepchildren, grandchildren, parents, grandparents): fully exempt, 0%.
- Class C (siblings, son-in-law, daughter-in-law): first $25,000 exempt, then 11% to 16%.
- Class D (nieces, nephews, friends, most others): 15% up to $700,000 and 16% above $700,000, with essentially no exemption.
- Class E (charities, government): exempt.
Source: NJ Division of Taxation, “Inheritance and Estate Tax,” 2026. A Roth account passes to Class A heirs free of New Jersey income tax on qualified distributions and free of inheritance tax, which is why the account type interacts with legacy planning. For the federal side, see our note on the 2026 estate tax exemption (the federal estate and gift exemption is $15,000,000 per person for 2026).
Stay NJ, ANCHOR, and property tax relief for New Jersey retirees
New Jersey’s property-tax relief programs for seniors, including Stay NJ, the Senior Freeze, and ANCHOR, carry their own income caps (Source: NJ Division of Taxation, “Property Tax Relief Programs,” 2026). A large Roth conversion raises the income figures these programs test, so conversion timing can interact with eligibility for property-tax benefits, not just the income-tax exclusion.
Each of these programs measures income to decide eligibility or benefit size. Because a Roth conversion increases the income they look at in the conversion year, an oversized conversion can reduce or eliminate a property-tax benefit at the same time it touches the pension-exclusion cliff. Caps change, so confirm current figures with the NJ Division of Taxation before relying on them.
Residency and timing: when a New Jersey Roth conversion is taxed
New Jersey taxes a Roth conversion if you are a New Jersey resident in the conversion year. Federal law (4 U.S.C. 114) bars New Jersey from taxing the retirement-plan distribution of a nonresident, so a conversion is taxed by your state of legal residence that year (Source: NJ Division of Taxation, GIT-6, 2026; 4 U.S.C. 114).
You are a New Jersey resident if you are domiciled there, unless you keep no permanent home in New Jersey, have a permanent home elsewhere, and spend 30 days or fewer in the state. You are also a resident if you are not domiciled in New Jersey but keep a permanent home there and spend more than 183 days in the state (Source: NJ Division of Taxation, GIT-6, 2026). Because a conversion is taxed where you are resident when it happens, some households coordinate large conversions with a planned change of residence, a fact-specific decision with strict domicile rules. Our overview of moving to a tax-friendly state in retirement covers the traps; do not assume a partial-year move avoids New Jersey tax without confirming residency for the year.
How Rothology plans a Roth conversion for New Jersey residents
Q3 Advisors is a fiduciary registered investment adviser. The flat-fee Rothology Premier Roth Conversion service builds a multi-year conversion plan and tax projections that account for New Jersey’s rates, the pension-exclusion cliff, and basis recovery. It is an educational planning engagement; Q3 Advisors sells no insurance or investment products in connection with it.
For a New Jersey resident, our process models the conversion against the state’s specifics: the graduated rates up to 10.75%, the $100,000 and $150,000 exclusion tiers, GIT-2 basis recovery so previously-taxed contributions are not taxed twice, and the interaction with Social Security taxability and Medicare IRMAA at the federal level. We build a multi-year schedule rather than one large conversion and show the projected tax under each path so you can decide. The engagement is factual and educational: we do not tell you to move, we make no promise of tax savings, and Q3 Advisors acts as a fiduciary. Start with our Roth conversion service overview.
Frequently asked questions
Does New Jersey tax Roth conversions?
Yes. New Jersey taxes a Roth conversion as ordinary Gross Income Tax income in the conversion year at graduated rates from 1.4% to 10.75% (Source: NJ Division of Taxation, “NJ Income Tax Rates,” 2026). Only the amount above your previously-taxed New Jersey basis is taxable, and the Retirement Income Exclusion may reduce or eliminate the tax if you are 62 or older and under the income limits.
Does NJ tax Roth IRA withdrawals in retirement?
No. Qualified withdrawals from a Roth IRA are not included in New Jersey Gross Income, so they are not taxed by New Jersey and are not counted in the pension-exclusion income tests (Source: NJ Division of Taxation, “Retirement Income,” 2026). You pay New Jersey tax at conversion, then qualified Roth distributions come out state-tax-free in retirement.
At what age is retirement income tax-free in New Jersey?
Retirement income is never automatically tax-free in New Jersey, but at age 62 or older (or if disabled) you may claim the Retirement Income Exclusion when total gross income is $150,000 or less (Source: NJ Division of Taxation, “Retirement Income Exclusions,” 2026). It excludes up to $100,000 married filing jointly, $75,000 single, or $50,000 married filing separately, phasing down above $100,000 gross income.
Does New Jersey tax Social Security benefits?
No. New Jersey fully exempts Social Security and Railroad Retirement benefits at every income level, and you do not report them on the New Jersey return (Source: NJ Division of Taxation, “Exempt (Nontaxable) Income,” 2026). Social Security also does not count toward the $100,000 and $150,000 gross-income tests for the Retirement Income Exclusion, which helps in conversion years.
Do Roth conversions count toward the NJ pension exclusion threshold?
Yes, and this is the key trap. Conversion income is included in the $100,000 and $150,000 gross-income tests for the Retirement Income Exclusion in the conversion year (Source: NJ Division of Taxation, “Retirement Income Exclusions,” 2026). A large conversion can push gross income over $150,000 and forfeit the entire exclusion, so the conversion’s size relative to that cliff affects the outcome.
How does NJ tax 401(k) and traditional IRA withdrawals?
New Jersey taxes taxable 401(k) and traditional IRA withdrawals as ordinary income, but you recover previously-taxed New Jersey basis first under GIT-2, and the Retirement Income Exclusion may apply if you are 62 or older and under $150,000 gross income (Source: NJ Division of Taxation, GIT-1&2, 2026). Pre-tax employer 401(k) money generally carries no New Jersey basis.
Does New Jersey have an estate or inheritance tax on retirement accounts?
New Jersey has no estate tax; it was repealed for deaths on or after January 1, 2018 (Source: NJ Division of Taxation, “Inheritance and Estate Tax,” 2026). It keeps an inheritance tax based on the heir’s relationship: spouses, children, and grandchildren are exempt, while others pay 11% to 16%. A Roth left to Class A heirs passes free of New Jersey inheritance tax.
Sources
- NJ Division of Taxation, “NJ Income Tax Rates” and 2026 NJ-1040 Rate Schedules, nj.gov/treasury/taxation/taxtables.shtml (2026).
- NJ Division of Taxation, “Retirement Income,” njit6.shtml (2026).
- NJ Division of Taxation, “Retirement Income Exclusions,” nj.gov/treasury/taxation/njit7.shtml (2026).
- NJ Division of Taxation, GIT-1&2 “Pensions and Annuities” (January 2026).
- NJ Division of Taxation, “Exempt (Nontaxable) Income,” njit12.shtml (2026).
- NJ Division of Taxation, “Inheritance and Estate Tax,” nj.gov/treasury/taxation/inheritance-estate/inheritance.shtml (2026).
- NJ Division of Taxation, “Property Tax Relief Programs” (Stay NJ, Senior Freeze, ANCHOR), nj.gov/treasury/taxation/relief.shtml (2026).
- NJ Division of Taxation, GIT-6 “Part-Year Residents and Nonresidents,” and NJ-1040 instructions (2026); 4 U.S.C. 114.