Contributions to a 403(b) plan are not tax deductible in NJ. New Jersey’s Gross Income Tax Act treats your elective deferrals as fully taxable wages in the year you earn them, even though the federal government lets you defer tax on that same money until retirement. The state extends a contribution exclusion to 401(k) plans and stops there. Teachers, hospital employees, and nonprofit workers who rely on 403(b) accounts pay New Jersey income tax on every dollar going in, and the payoff comes later, when withdrawals draw against a basis the state has already taxed.
Why New Jersey Excludes 401(k) Contributions but Not 403(b)
The difference comes down to one statute. N.J.S.A. 54A:6-21 excludes from gross income amounts contributed to a qualified cash or deferred arrangement under Section 401(k) of the Internal Revenue Code.1Justia Law. Silvester and Yongjie Tuohy vs. Director, Division of Taxation It names 401(k) plans and nothing else. Because 403(b) plans sit under a different section of the federal tax code, they fall outside the exclusion.
The New Jersey Division of Taxation puts it directly: the Gross Income Tax Act “does not have a provision deferring the tax on contributions made by an employer or employee to a §403(b) plan.”2State of New Jersey – Department of the Treasury – Division of Taxation. Treatment of Employer Post-Retirement Contributions to a Section 403(b) Plan The state’s wages guidance says the same thing from the other direction: “New Jersey does not allow you to exclude from wages amounts you contribute to deferred compensation and retirement plans, other than 401(k) Plans,” and it lists 403(b) plans by name.3New Jersey Department of the Treasury. New Jersey Division of Taxation – Wages
Employer Contributions Are Taxed Too
A common mistake is assuming only the money you defer from your paycheck gets taxed. New Jersey treats employer contributions the same way. According to the Division of Taxation, “These contributions are taxable in the year they are made and are subject to withholding like any other wage or remuneration paid an employee.”2State of New Jersey – Department of the Treasury – Division of Taxation. Treatment of Employer Post-Retirement Contributions to a Section 403(b) Plan That is a real break from federal treatment, where employer contributions to a 403(b) are generally excluded from your taxable income until you take money out.
The result: aside from investment growth, every dollar in your 403(b) has already faced New Jersey income tax before you retire. Your state rate on that income runs through New Jersey’s brackets, from 1.4% on the first $20,000 of taxable income up to 10.75% on income above $1 million.4State of New Jersey Department of the Treasury. New Jersey Tax Rate Schedules
How Your W-2 Should Look and What to Put on the NJ-1040
The mismatch shows up on your W-2. Box 1 reports federal taxable wages, which are reduced by your 403(b) elective deferrals. Box 16 reports New Jersey wages, which should be higher because those deferrals are added back in.5New Jersey Division of Taxation. Common Filing Mistakes The Division of Taxation flags this as one of the most frequent filing errors, with taxpayers copying the smaller Box 1 figure onto their NJ-1040 by mistake.
Use Box 16 for your wage income on the NJ-1040, and check that “NJ” or “New Jersey” appears in the state identification box.3New Jersey Department of the Treasury. New Jersey Division of Taxation – Wages If your employer did not adjust Box 16 to include your 403(b) deferrals, you have to add them back yourself when reporting state income. Your deferral amount typically appears in Box 12 with Code E.
Save Your W-2s: They Determine What You Owe in Retirement
Every W-2 that shows a 403(b) contribution is evidence of tax you already paid to New Jersey. Those records build your contribution basis, and basis is what keeps the state from taxing the same dollars twice when you start withdrawing in retirement. Lose the records, and you risk paying state tax on money that should come out tax-free.
Because the state taxes employee and employer contributions alike as they’re made, your basis includes both sides of the ledger, not just what you personally deferred. For a career-long 403(b) holder, that basis can be substantial.
What Happens at the Retirement End
The tradeoff for losing the upfront deduction is that New Jersey does not tax those same contribution dollars again when you withdraw them. Only the investment earnings your account produced along the way are subject to state income tax on distribution.2State of New Jersey – Department of the Treasury – Division of Taxation. Treatment of Employer Post-Retirement Contributions to a Section 403(b) Plan
New Jersey uses two methods to split each distribution between tax-free basis and taxable earnings. The Three-Year Rule applies if your total contributions can be recovered within 36 months of your first payment; distributions are entirely tax-free until basis is recovered, and taxable after that. If recovery takes longer, the General Rule applies instead, making a fixed percentage of each payment tax-free based on your expected lifetime. Most people with decades of 403(b) contributions land in the General Rule, and calculating the fraction correctly depends on knowing your exact lifetime contributions.
The Retirement Income Exclusion Can Erase What’s Left
New Jersey residents who are 62 or older, or who qualify as disabled under Social Security guidelines, can exclude a portion of their pension, annuity, and retirement account withdrawals from state taxable income, provided total income for the year is $150,000 or less.6New Jersey Division of Taxation. Retirement Income Exclusions
- Total income of $100,000 or less: married filing jointly can exclude up to $100,000; single or head of household up to $75,000; married filing separately up to $50,000.
- Total income of $100,001 to $125,000: 50% of the full exclusion for joint filers, 37.5% for single filers, 25% for married filing separately.
- Total income of $125,001 to $150,000: 25% for joint filers, 18.75% for single filers, 12.5% for married filing separately.
- Total income above $150,000: no exclusion.
The exclusion applies to the taxable portion of your distribution, meaning the earnings and any amount that wasn’t previously taxed. Between basis recovery and this exclusion, many New Jersey retirees with moderate incomes owe little or no state tax on their 403(b) withdrawals.6New Jersey Division of Taxation. Retirement Income Exclusions
A Note on Roth 403(b) Contributions
Roth 403(b) contributions are already made with after-tax dollars federally, so they line up naturally with New Jersey’s treatment of all 403(b) contributions as taxed wages at the time of deferral. What’s less settled is whether New Jersey treats qualified Roth 403(b) distributions the same way it treats qualified Roth IRA distributions, which are tax-free at the state level. The state has published clear guidance on Roth IRAs but has been less explicit about Roth 403(b) accounts. If your Roth 403(b) balance is significant, get advice from a tax professional familiar with New Jersey rules before you start taking money out.