NJ state tax on 401(k) withdrawals runs from 1.4% to 10.75% under the state’s Gross Income Tax, with most retirees landing in the lower brackets. If you’re 62 or older (or disabled) and your total income for the year is $150,000 or less, the retirement income exclusion can shelter up to $100,000 of the distribution from state tax entirely. What you actually owe depends on when your contributions were made, how large the withdrawal is, and what other income you have that year.
How Much of the Distribution Is Taxable
Almost all of it, for most people. Employee contributions made on or after January 1, 1984 were not subject to New Jersey Gross Income Tax going in, so those contributions and every dollar of earnings on them are fully taxable coming out.1NJ.gov. New Jersey Income Tax Guide – Retiring in New Jersey Anyone who started contributing after 1984 has a zero cost basis for New Jersey purposes.
Contributions made before January 1, 1984 were already taxed by the state, so New Jersey will not tax those same dollars again on distribution. More than 40 years on, this affects very few current retirees.
This is where New Jersey diverges from the federal treatment in a way that occasionally helps: because the state may already have taxed a slice of your contributions, the New Jersey-taxable amount of a distribution can be smaller than the federal-taxable amount. For post-1984 money, though, the two figures match.
New Jersey’s Tax Rates on 401(k) Income
Once the taxable portion is set, it gets added to your other income and taxed at the state’s graduated rates. Brackets begin at 1.4% on the first $20,000 of taxable income and climb through several tiers to 10.75% on income above $1 million.2NJ.gov. NJ Division of Taxation – NJ Income Tax Rates Because New Jersey does not tax Social Security benefits, most retirees living off 401(k) distributions and Social Security stay in the lower brackets.
The Retirement Income Exclusion
This is the single biggest break the state offers on 401(k) withdrawals, and it can wipe out the tax entirely if you qualify.
Who Qualifies
You (or your spouse, on a joint return) must be 62 or older, or meet the Social Security definition of disabled, by December 31 of the tax year. Your total income for the year must be $150,000 or less.3State of NJ – Department of the Treasury – Division of Taxation. Retirement Income Exclusions Total income means everything — wages, business income, investment gains, pensions, the 401(k) distribution itself. Go one dollar over $150,000 and the exclusion disappears entirely. This is a cliff, not a slope.
Maximum Amounts
With total income of $100,000 or less, the full exclusion is available:3State of NJ – Department of the Treasury – Division of Taxation. Retirement Income Exclusions
- Married filing jointly: up to $100,000
- Single or head of household: up to $75,000
- Married filing separately: up to $50,000
You exclude the lesser of your actual taxable retirement income or the maximum for your filing status. The cap applies to the combined total of pensions, annuities, IRA withdrawals, and 401(k) distributions, not to each source separately.
The Phase-Out Between $100,001 and $150,000
If total income falls in this range, a partial exclusion applies:3State of NJ – Department of the Treasury – Division of Taxation. Retirement Income Exclusions
- $100,001 to $125,000: 50% for joint filers, 37.5% single, 25% married filing separately
- $125,001 to $150,000: 25% joint, 18.75% single, 12.5% married filing separately
So a married couple with $110,000 in total income and $40,000 in 401(k) distributions could exclude $20,000, not the full $40,000. Sizing and timing withdrawals around the $100,000 and $150,000 lines saves real money.
The $3,000 Earned Income Rule
New Jersey splits the exclusion into two pieces: a pension exclusion (pensions, annuities, IRA withdrawals) and a separate “other retirement income” exclusion. To use the second piece, your income from wages, business profits, and partnership or S corporation income must be $3,000 or less for the year.3State of NJ – Department of the Treasury – Division of Taxation. Retirement Income Exclusions The two exclusions combined cannot exceed the maximums above. If you are still working meaningfully, this limit can cap how much retirement income you shelter.
Roth 401(k) Distributions and Conversions
New Jersey generally follows the federal rules for Roth accounts. Qualified distributions are excludable from income and do not need to be reported on your New Jersey return at all.4NJ.gov. NJ Division of Taxation – Roth IRAs A distribution is qualified if the account has been open at least five years and you are 59½ or older, disabled, or the payment goes to a beneficiary after your death.
The trap is Roth conversion. If you roll a traditional 401(k) into a Roth IRA, any amount not previously taxed by New Jersey must be included in income on your state return in the year of the conversion.4NJ.gov. NJ Division of Taxation – Roth IRAs Because most post-1984 contributions escaped state tax on the way in, a conversion can generate a substantial New Jersey bill on both principal and earnings.
Rollovers
Rolling your 401(k) directly into another eligible retirement plan or IRA is not a taxable event for New Jersey, provided it qualifies for federal tax deferral.5NJ.gov. NJ Division of Taxation – IRA Distributions A trustee-to-trustee transfer is the cleanest option because the money never touches your hands.
Indirect rollovers are riskier. You have 60 days to deposit the full amount into another eligible account.6Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions The plan administrator must withhold 20% for federal taxes on any distribution paid directly to you.7Internal Revenue Service. 401(k) Resource Guide – Plan Participants – General Distribution Rules To complete a full rollover you have to replace that 20% out of pocket and redeposit the entire original balance within the window. Miss it and the whole distribution becomes taxable for both federal and New Jersey purposes.
Early Withdrawals Before 59½
The federal government adds a 10% additional tax on distributions taken before 59½. New Jersey imposes no equivalent penalty.1NJ.gov. New Jersey Income Tax Guide – Retiring in New Jersey The distribution is still fully taxable as ordinary income on your state return, but there is no state-level early withdrawal penalty on top of it. The federal 10% is not deductible against your New Jersey tax either.
Required Minimum Distributions and Timing
Federal rules require you to begin RMDs from your 401(k) by April 1 of the year after you turn 73.8Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs If you are still working and do not own 5% or more of the company sponsoring the plan, you can delay RMDs until you actually retire. New Jersey taxes RMDs as ordinary income like any other 401(k) distribution, and the exclusion applies if you qualify.
Watch the first RMD carefully. Taking it by the April 1 deadline in the year after you turn 73 means two RMDs land in one calendar year, which can push total income past the $150,000 cliff or into a worse phase-out tier. Spacing withdrawals around those cutoffs is one of the more effective planning moves.
If You Move Out of New Jersey
Federal law bars states from taxing retirement income received by non-residents. Under 4 U.S.C. § 114, no state may tax retirement distributions paid to someone who does not live there, even if the money was earned and contributed while they did.9Office of the Law Revision Counsel. 4 USC 114 – Limitation on State Income Taxation of Certain Pension Income Once you have established residency elsewhere, New Jersey cannot tax your 401(k). Part-year residents file Form NJ-1040 and report only the income received while a New Jersey resident, with a prorated share of the exclusion available.10NJ.gov. NJ Division of Taxation – Income Tax – Part-Year Residents
Withholding and Estimated Payments
The 20% federal withholding on direct distributions does not cover New Jersey tax. State withholding is separate and voluntary. You can file Form NJ-W-4P with your plan or annuity payer to have a specific dollar amount withheld, minimum $10 per payment.11NJ.gov. NJ-W-4P Certificate of Voluntary Withholding of New Jersey Gross Income Tax From Pension and Annuity Payments
If withholding falls short and you expect to owe more than $400 at filing, New Jersey requires quarterly estimated payments using Form NJ-1040-ES.12New Jersey Division of Taxation. 2026 NJ-1040-ES Instructions Underpayment triggers an interest charge at 3% above the prime rate.13NJ.gov. Interest on Underpayment of Estimated Tax A large lump-sum withdrawal mid-year is the easiest way to trip this. Setting up voluntary withholding or making an estimated payment right after the distribution keeps you clear of it.