NJ-1040-ES Estimated Tax: Deadlines, Safe Harbor, and Penalties

If you expect to owe New Jersey more than $400 in income tax after subtracting withholdings and credits, the state wants that money in quarterly installments, not in one payment at filing time. Form NJ-1040-ES is the estimated tax voucher you use to send those installments. Payments are due April 15, June 15, September 15, and January 15 of the following year, and you avoid an underpayment interest charge by paying at least 80% of the current year’s tax or 100% of last year’s, whichever is smaller.¹²

Who Has To File

Residents and nonresidents with New Jersey-sourced income both fall under the same rule: if your expected NJ tax liability after withholdings and credits will exceed $400, you must file a declaration of estimated tax.³ That threshold is lower than most people expect.

The income that usually pushes people over the line is income no employer withholds on: self-employment earnings, rental income, interest, dividends, capital gains, and pension or retirement distributions without adequate NJ withholding.

If the gap between your withholding and your liability is small, you have another option. Increasing wage withholding through Form NJ-W4, or pension withholding through Form NJ-W-4P, can close the gap without quarterly vouchers. That path works best when your extra income is modest and predictable.

Quarterly Deadlines

New Jersey splits the year into four installments:⁴

Quarter 1: April 15
Quarter 2: June 15
Quarter 3: September 15
Quarter 4: January 15 of the following year

When a due date falls on a weekend or legal holiday, it moves to the next business day.⁴ The spacing is uneven. Only two months separate the first and second payments, but nearly four separate the second and third, so the June deadline is the one most likely to catch you off guard.

These dates match the federal 1040-ES schedule, so if you owe both, you can work them on a single calendar.

Figuring Out What To Pay

The NJ-1040-ES packet includes a worksheet, but the Division of Taxation suggests something simpler: fill out a blank NJ-1040 using your projected numbers for the year.⁵ A blank return already has lines for every income category, exemption, and credit, which makes it harder to overlook something.

The steps:

Add up your expected New Jersey taxable income for the year: wages, self-employment, rentals, interest, dividends, capital gains, pensions, and anything else taxable.
Subtract exemptions and deductions you qualify for.
Apply the NJ rate brackets to what’s left.
Subtract credits (such as the credit for taxes paid to other states) and expected withholdings.

Whatever remains is your estimated tax. If it’s $400 or less, you don’t need to file vouchers. If it’s more, divide by four for each installment.¹

New Jersey Rate Brackets

New Jersey uses the same brackets for every filing status:

Up to $20,000: 1.4%
$20,001 to $35,000: $280 plus 1.75% of the amount over $20,000
$35,001 to $40,000: $542.50 plus 3.5% of the amount over $35,000
$40,001 to $75,000: $717.50 plus 5.525% of the amount over $40,000
$75,001 to $500,000: $2,651.25 plus 6.37% of the amount over $75,000
$500,001 to $1,000,000: $29,723.75 plus 8.97% of the amount over $500,000
Over $1,000,000: $74,573.75 plus 10.75% of the amount over $1,000,000

If projecting the year feels like guesswork, use last year’s income as a starting point and adjust for changes you know about.⁵ Taxpayers with no prior NJ return have to use the current-year method, since the prior-year safe harbor needs a previous return to point at.

Safe Harbor: Paying Enough To Avoid Penalties

You don’t have to hit your liability exactly. New Jersey sets safe harbor thresholds, and meeting one protects you from an underpayment charge even if you end up owing more at filing. Your required annual payment is the lesser of two figures.²

80% Of This Year’s Tax

If your total payments (estimates plus withholdings) come to at least 80% of the tax shown on your current-year NJ-1040, you’re safe. This works best when income is dropping compared to last year. The risk: if you misjudge income and fall short of 80% of what you actually owe, interest applies to the shortfall.

100% Of Last Year’s Tax

Paying at least 100% of the tax shown on your previous year’s NJ return protects you no matter how much this year’s income rises. For most people this is the easier route because the number is already sitting on a filed return; no projection needed.

110% For Higher Incomes

If your prior-year New Jersey gross income exceeded $150,000 ($75,000 if you filed Married/Civil Union Partner Filing Separately), the prior-year safe harbor rises to 110% of last year’s tax.² Spread that across four installments and you’re covered regardless of what the current year turns out to look like.

Adjusting Partway Through The Year

If income or deductions shift mid-year, recalculate your annual total and spread the new number evenly across the installments you still have left. You don’t have to redo earlier payments. The point is to hit the safe harbor total by the time the last installment lands.

How To Send The Payment

By Mail

Fill out the NJ-1040-ES voucher with your name, address, and Social Security Number (both SSNs for joint filers). Make the check or money order payable to “State of New Jersey – TGI” and write your Social Security Number on the check itself.⁴ Send it to:

State of New Jersey
Division of Taxation
Revenue Processing Center
PO Box 222
Trenton, NJ 08646-0222¹

The paper voucher is only needed when you’re paying by check or money order. Skip it if you pay electronically.

Online

The Division of Taxation accepts electronic payments through its website. E-check pulls the payment from your bank account and lets you schedule all four installments in advance, which removes the risk of forgetting a date. Credit card payments run through a third-party processor and carry a convenience fee that doesn’t count toward your tax.

What Happens If You Underpay

New Jersey doesn’t frame the underpayment charge as a flat penalty. It’s interest on the amount you were short, running from each installment due date until the underpayment is cured. You calculate it on Form NJ-2210.⁶

For 2026, the rate is 10%: the prime rate of 7% plus 3%.⁷ Interest runs from the installment due date to the earlier of when the underpayment is satisfied or the original filing deadline, typically April 15.⁶

One detail catches people out: paying the full remaining balance on April 15 does not erase interest on installments that were short earlier in the year. Each quarter stands on its own.

Exceptions That Cancel The Charge

The most-used exception is the annualized income method. If income came in unevenly (seasonal work, a one-time capital gain in December, a business that ramps up late in the year), annualizing lets you show you paid the right share of tax on the income actually earned in each quarter. The calculation uses a worksheet attached to Form NJ-2210, so keep records of when income was received.⁶

Taxpayers who met the 110% prior-year safe harbor are automatically protected, and so are those who hit the 100% prior-year or 80% current-year thresholds. An exception also exists for underpayments caused by a casualty, disaster, or other unusual circumstance the state recognizes.⁸

NJ-1040-ES Doesn’t Cover Your Federal Obligation

Sending NJ-1040-ES vouchers has no effect on what you owe the IRS. If you expect to owe more than $1,000 in federal tax after withholdings and refundable credits, you likely need to file Form 1040-ES separately. The deadlines are identical, but the safe harbor is stricter: the federal current-year threshold is 90%, not 80%. Some taxpayers who are safe under New Jersey rules can still owe a federal penalty.⁹

1
New Jersey Division of Taxation. 2026 Form NJ-1040-ES Instructions
2
NJ Division of Taxation. Notice on Estimated Tax Payments
3
Cornell Law Institute. NJ Admin Code 18-35-3.1 – Estimated Tax
4
NJ Division of Taxation. Estimated Payments
5
NJ Division of Taxation. GIT-8 Estimating Income Taxes
6
NJ.gov. NJ-2210 Underpayment of Estimated Tax by Individuals, Estates, or Trusts
7
NJ.gov. Technical Bulletin TB-21R – Interest Rate Assessed on Tax Balances for 2026
8
NJ Division of Taxation. Interest on Underpayment of Estimated Tax
9
Internal Revenue Service (IRS). Form 1040-ES Estimated Tax for Individuals