--- title: "New Jersey RSU Tax Calculator (2026): Withholding, Shortfall, and Vesting Examples" slug: nj-rsu-vesting-tax publishedAt: 2026-06-16T17:00:09.000Z updatedAt: 2026-06-17T16:41:54.811Z author: "Mike Navarro" authorSlug: mike-navarro category: "State Tax" tags: ["New Jersey", "RSU", "Withholding", "Vesting", "State Tax"] excerpt: "New Jersey RSU tax calculator: federal 22% supplemental vs NJ brackets up to 10.75% over $1M — three worked vests and the dollar shortfall." canonical: https://myequitytax.com/blog/nj-rsu-vesting-tax --- A New Jersey RSU tax calculator estimates federal plus NJ state tax on each vest, where NJ's top rate hits 10.75% above $1M. Default 22% federal supplemental withholding usually under-collects — the calculator shows the dollar shortfall for your bracket. [**Open the New Jersey RSU tax calculator with these inputs prefilled →**](/calculator/rsu?state=NJ&shares=100&fmv=80&salary=120000) ## How New Jersey taxes your RSU vest New Jersey treats RSU income like ordinary W-2 wages: when shares vest, the fair-market value on the vest date hits your Form W-2 Box 1 and is taxed under New Jersey's progressive Gross Income Tax ([IRS Publication 525](https://www.irs.gov/publications/p525)). Unlike flat-tax states such as Massachusetts or Illinois, New Jersey climbs to a **top marginal rate of 10.75%** on income above $1,000,000 — one of the highest in the country. The two numbers that matter on every vest: - **Federal supplemental withholding rate:** 22% on RSU income up to $1M ([IRS Publication 15](https://www.irs.gov/publications/p15)). Above $1M of supplemental wages, the rate jumps to 37%. - **New Jersey supplemental withholding rate:** NJ does not publish a single fixed "supplemental" rate the way California or New York do. Employers use the NJ Gross Income Tax withholding tables tied to filing status and wages, so your effective state withholding depends on your bracket — at the top, the rate reaches 10.75%. The calculator estimates the state piece from your filing status and income. If your marginal federal bracket is higher than 22%, your employer is under-withholding on the federal side. ## Worked examples (New Jersey, 2025) These three scenarios use the EquityTax calculator. Federal and FICA figures come directly from the engine; the NJ state-tax amounts are computed from New Jersey's 2025 Gross Income Tax brackets (none of the three households below cross the $1M top-rate threshold, so the 10.75% rate never applies). ### Example 1 — Junior IC, single filer **Inputs:** $120K salary, single filer, 100 RSUs vesting at $80 FMV ($8,000 RSU income). **Result:** - Federal withholding: $1,760 - New Jersey tax on the vest: ~$509.60 (NJ's 6.37% bracket) — withheld via the NJ-WT tables, which roughly track this, so little state-side surprise - Estimated federal + FICA tax on the vest: $2,532 - Federal shortfall vs default withholding: $160 - **Total owed at filing:** the $160 federal gap plus ~$509.60 of NJ tax on the vest The 22% federal default closely matches the 24% marginal rate at this income, so the federal gap is small — $160 on $8,000 of vest income. On the state side, household income of $128,000 sits in NJ's 6.37% bracket, so the vest draws ~$509.60 of New Jersey tax — well below the $1M top-rate cutoff. [Run this scenario in the calculator →](/calculator/rsu?state=NJ&shares=100&fmv=80&salary=120000) ### Example 2 — Mid-level IC, married filing jointly **Inputs:** $200K salary, married filing jointly, 400 RSUs vesting at $120 FMV ($48,000 RSU income). **Result:** - Federal withholding: $10,560 - New Jersey tax on the vest: ~$3,057.60 (NJ's 6.37% bracket) — withheld via the NJ-WT tables, which roughly track this - Estimated federal + FICA tax on the vest: $11,452 - Federal shortfall vs default withholding: $196 - **Total owed at filing:** the $196 federal gap plus ~$3,057.60 of NJ tax on the vest Household income of $248,000 puts this couple in the 24% federal bracket. The 22% supplemental rate is still short by 2 points on the RSU income — a $196 federal gap. The NJ portion lands in the 6.37% bracket — ~$3,057.60 on the $48,000 vest — well below the $1M top-rate threshold. [Run this scenario in the calculator →](/calculator/rsu?state=NJ&shares=400&fmv=120&salary=200000) ### Example 3 — Senior IC, married filing jointly **Inputs:** $350K salary, married filing jointly, 1,500 RSUs vesting at $200 FMV ($300,000 RSU income). **Result:** - Federal withholding: $66,000 - New Jersey tax on the vest: ~$22,958 (NJ's 6.37% and 8.97% brackets) — withheld via the NJ-WT tables - Estimated federal + FICA tax on the vest: $100,485.50 - Federal shortfall vs default withholding: $27,435.50 - Estimated federal underpayment penalty: $1,920.49 - **Total owed at filing:** the $27,435.50 federal gap (plus the $1,920.49 penalty) and ~$22,958 of NJ tax on the vest This is where NJ RSU earners get hurt. Household income lands at $650,000, deep into the 35% federal bracket — still below the $1M line for NJ's 10.75% top rate. The $300,000 vest crosses NJ's $500,000 threshold, so it is taxed across the 6.37% and 8.97% brackets — ~$22,958 of New Jersey tax. The employer withholds federal at 22%, so on $300,000 of RSU income the federal gap alone is $27,435.50, plus a $1,920.49 underpayment penalty if no quarterly payment is made. [Run this scenario in the calculator →](/calculator/rsu?state=NJ&shares=1500&fmv=200&salary=350000) ## Why employer withholding usually isn't enough in New Jersey The gap on every NJ RSU vest splits cleanly in two. The **federal** gap is mechanical: the 22% supplemental rate is fixed, but the moment your total income crosses into the 24%, 32%, 35%, or 37% brackets your employer is under-withholding on RSU income. The **New Jersey** gap depends on where the vest pushes household income inside NJ's progressive schedule. The fix depends on the size of the gap: 1. **Adjust your W-4** so paycheck withholding picks up the difference across the year ([IRS W-4 instructions](https://www.irs.gov/forms-pubs/about-form-w-4)). 2. **Make a quarterly estimated payment** if the shortfall is concentrated around a single vest — to both the IRS and the NJ Division of Taxation. 3. **Sell-to-cover at vest** if your broker offers it; this can absorb the federal gap, but the NJ state gap usually needs separate action. The 22% federal supplemental rate is a default — not your actual marginal rate. If total income puts you in the 32%, 35%, or 37% bracket, federal under-withholding alone can run into five figures on a single senior-IC vest. NJ's 10.75% top rate only compounds this above $1M, but lower NJ brackets still leave a state-side gap on most vests. ## How the New Jersey RSU tax calculator handles state liability The NJ calculator uses the EquityTax engine to walk the full 2025 IRS federal bracket schedule for your filing status — where most of the shortfall comes from — and overlays the New Jersey Gross Income Tax schedule on the RSU income. State-side numbers on this page are routed through the approval queue because the state-tax data file currently exposes only NJ's 10.75% top rate. [Open the calculator with your inputs →](/calculator/rsu?state=NJ) ## FAQ **Does New Jersey charge a higher rate on RSU income than on regular salary?** No. NJ applies the same Gross Income Tax brackets to RSU vest income and salary — both are ordinary income. The 10.75% top rate applies once total taxable income exceeds $1,000,000, regardless of source. **Why is my New Jersey RSU shortfall so unpredictable?** NJ withholding uses bracket-based tables tied to your wage rate, not a single supplemental flat rate. When a vest spikes annualized income into a higher bracket than the tables assume, state-side withholding falls short. Federal 22% is mechanical; NJ is sensitive to where the vest lands in the schedule. **Do I owe New Jersey tax on RSUs that vest while I live out of state?** Generally only on the portion attributable to New Jersey workdays during the vesting period — sourcing rules apply. Verify your specific situation with the [New Jersey Division of Taxation](https://www.state.nj.us/treasury/taxation/individuals.shtml) and a CPA. **When does New Jersey's 10.75% top rate apply to my RSUs?** The 10.75% rate applies to taxable income above $1,000,000 in a tax year — including RSU vest income on top of salary and any other New Jersey-source income. If a large vest pushes your household income across that line, plan for the state-side gap with a quarterly estimated payment, because bracket-based supplemental withholding typically does not cover the jump to the top rate. ## Sources - IRS Publication 525, *Taxable and Nontaxable Income* — RSU treatment, fair-market-value rules. - IRS Publication 15, *Employer's Tax Guide* — federal supplemental withholding rate (22% / 37%). - [New Jersey Division of Taxation](https://www.state.nj.us/treasury/taxation/individuals.shtml) — state Gross Income Tax brackets, supplemental withholding, and equity-comp guidance. - EquityTax New Jersey RSU Calculator (internal engine, last verified 2026-05-09). *Estimate only — not financial or tax advice. Consult a qualified CPA before making decisions about exercising stock options, selling equity, or other financial moves.*