New Jersey levies a progressive state income tax with rates climbing from 1.4% to 10.75% across several brackets, and the thresholds differ depending on whether you file single or jointly. This calculator applies the correct 2024 NJ-1040 rate schedule to your taxable income and reports the tax owed alongside your marginal and effective rates.
How it works
The tool first reduces gross income to taxable income, then integrates the tax bracket by bracket:
taxable = grossIncome − (exemptions × 1000) − otherDeductions
tax = sum over brackets of (incomeInBracket × bracketRate)Because each slice of income is taxed at its own rate, this marginal method gives the exact NJ tax without needing the “subtract a fixed amount” shortcut printed in the instructions. The married-joint schedule has wider lower brackets than the single schedule, so joint filers generally pay less on the same income.
Example and notes
A single filer with $80,000 gross income and one $1,000 exemption has $79,000 taxable. The tax is 1.4% on the first $20,000 ($280), 1.75% on the next $15,000 ($262.50), 3.5% on the next $5,000 ($175), 5.525% on the next $35,000 ($1,933.75), and 6.37% on the final $4,000 over $75,000 ($254.80) — about $2,906 total, an effective rate near 3.6%.
Notes: this covers New Jersey state tax only and uses the 2024 schedules. Dependents actually carry a $1,500 exemption in New Jersey, slightly more than the $1,000 used here, and credits such as the property-tax credit can lower the bill further — so treat the output as an estimate, not tax advice.