How to Fill Out NJ-W4: Allowances, Wage Chart, and Exemption

To fill out the NJ-W4, enter your name, address, and Social Security number at the top, check your filing status on Line 2, run the Personal Allowance Worksheet on page 2 and put the total on Line 4, use the wage chart to pick a rate letter on Line 3 if you have a working spouse or a second job, add any extra dollar amount on Line 5, sign the form, and give it to your employer’s payroll department. The form tells your New Jersey employer how much state income tax to withhold from each paycheck, and it is separate from the federal W-4 even though your employer needs both.1State of New Jersey – Division of Taxation. NJ-WT New Jersey Income Tax Withholding Instructions

What to Have in Front of You

Download the current form from the New Jersey Division of Taxation site or grab a copy from payroll.2NJ Division of Taxation. Employee’s Withholding Allowance Certificate (Form NJ-W4) Before you start writing, have your Social Security number, your legal name and current address as they’ll appear on your tax return, and the filing status you plan to use. If your spouse works, have a rough number for their wages too, because that figure decides whether you need Line 3.

Your employer cannot substitute your federal W-4 for New Jersey withholding. The federal form dropped personal allowances, and New Jersey still uses them. Two forms, two systems.1State of New Jersey – Division of Taxation. NJ-WT New Jersey Income Tax Withholding Instructions

Line 1: Your Identification

Enter your full legal name, home address, and Social Security number in the spaces at the top. The name and address should match what you use on your New Jersey return, and the SSN links your withholdings to the right state tax account.

Line 2: Filing Status

Check one box:

  • Box 1: Single
  • Box 2: Married/Civil Union Couple Filing Joint Return
  • Box 3: Married/Civil Union Partner Filing Separate Return
  • Box 4: Head of Household
  • Box 5: Qualifying Widow(er)/Surviving Civil Union Partner

Your choice picks the default rate table. Box 1 or Box 3 sends your employer to Rate Table A. Box 2, 4, or 5, with Line 3 left blank, sends them to Rate Table B.1State of New Jersey – Division of Taxation. NJ-WT New Jersey Income Tax Withholding Instructions Those defaults work for most single-income households. If more than one income lands on your return, keep reading before you skip Line 3.

Line 4: Allowances From the Worksheet

Flip to the Personal Allowance Worksheet on the second page. You claim one allowance for yourself, one for your spouse or civil union partner if filing jointly, and one for each dependent (generally children under 22 whom you support). Extra allowances are available if you or your spouse are 65 or older, or if either of you is blind or has a permanent disability.2NJ Division of Taxation. Employee’s Withholding Allowance Certificate (Form NJ-W4)

Add the lines. The total goes on Line 4. Each allowance shields part of your gross pay from withholding, so claiming too many means too little tax comes out during the year, and claiming too few means you overpay and wait for a refund.

Line 3: The Wage Chart (Where Most People Underwithhold)

Line 3 exists because two paychecks stacked on one return often push into a higher bracket than either job alone. If you leave it blank and checked Box 2, 4, or 5, your employer uses Rate B, which assumes a single-income household at your pay level. When your spouse also earns, Rate B is usually too low.

Find the wage chart printed on the form. Locate the row for your wages and the column for your spouse’s wages (or your second job’s wages). The chart gives you a letter. Enter that letter on Line 3.2NJ Division of Taxation. Employee’s Withholding Allowance Certificate (Form NJ-W4) Your employer will then use the corresponding rate table instead of the default. Skipping this step is the single most common reason dual-earner households get a bill in April.1State of New Jersey – Division of Taxation. NJ-WT New Jersey Income Tax Withholding Instructions

Line 5: Extra Withholding

If you want a flat dollar amount taken out of each check on top of what the tables produce, enter it here. This is useful when you have freelance, rental, or other income that doesn’t run through payroll. Estimate the tax you’ll owe on that outside income, divide by your number of pay periods, and enter that figure. There is no worksheet for Line 5; it is whatever number you decide.

Line 6: Claiming Exemption

Line 6 is only for people who had no New Jersey tax liability last year and expect none this year. If that’s you, write “EXEMPT” on Line 6 and skip Lines 3 through 5. The exemption expires every year. You must file a new NJ-W4 claiming it at the start of each calendar year, or your employer reverts to withholding based on your prior non-exempt form.3State of New Jersey – Division of Taxation. NJ Employee’s Withholding Allowance Certificate Most people who legitimately qualify are students or very low-income workers whose earnings fall below New Jersey’s filing threshold.

Sign and Hand It to Payroll

Sign and date the bottom. An unsigned form is invalid, and your employer will withhold at the highest default rate until they receive one that’s signed.

Give the form to your employer’s payroll or human resources department. Do not mail it to the Division of Taxation. The form stays with your employer, who keeps it on file and produces it if the state asks.1State of New Jersey – Division of Taxation. NJ-WT New Jersey Income Tax Withholding Instructions Most companies accept it through a payroll portal; paper still works. The change usually shows up in one or two pay cycles.

If You Have More Than One Job

Each employer withholds only on what they pay you, and each payroll system assumes their check is your whole income. Combined, the total can sit in a higher bracket.

Two fixes. Use the wage chart on Line 3 at your highest-paying job to pick a rate letter that reflects your total household income. Then, if you want a cushion, add a flat amount on Line 5 at the second job.2NJ Division of Taxation. Employee’s Withholding Allowance Certificate (Form NJ-W4) One more rule: don’t claim the same allowances at both jobs. If you claim yourself at Job A, claim zero at Job B. Doubling up on allowances across employers is the fastest way to underwithhold.

Pennsylvania Residents Use a Different Form

If you live in Pennsylvania and work for a New Jersey employer, don’t fill out an NJ-W4. New Jersey and Pennsylvania have a reciprocal agreement, so your wages are not subject to New Jersey income tax. File Form NJ-165 (Employee’s Certificate of Non-Residence in New Jersey) with your employer instead. That stops New Jersey withholding, and you pay Pennsylvania tax on those wages.4NJ Division of Taxation. PA/NJ Reciprocal Income Tax Agreement

The agreement covers wages, salaries, tips, commissions, and bonuses. It does not cover self-employment income or gains from selling New Jersey property, so those still trigger a New Jersey nonresident return.4NJ Division of Taxation. PA/NJ Reciprocal Income Tax Agreement

Remote Workers in Delaware, Nebraska, or New York

Since 2023, New Jersey applies a convenience-of-the-employer sourcing rule. If you live in Delaware, Nebraska, or New York and work remotely for a New Jersey employer from your home state for your own convenience rather than because the job requires it, your wages are treated as New Jersey income. Your employer withholds New Jersey tax, and you fill out the NJ-W4 the same way a resident would.5State of NJ – Department of the Treasury – Division of Taxation. Convenience of the Employer Sourcing Rule Enacted for Gross Income Tax FAQ

The rule has limits. It does not apply if your employer genuinely needs you to work outside New Jersey, if you’re a Pennsylvania resident (reciprocity overrides it), if you’re a Connecticut resident (Connecticut’s own rule preempts it), or if you perform no work in New Jersey at all during the calendar year.5State of NJ – Department of the Treasury – Division of Taxation. Convenience of the Employer Sourcing Rule Enacted for Gross Income Tax FAQ

When to File a New NJ-W4

Outside the annual exemption renewal, New Jersey doesn’t require you to resubmit on a schedule. File a new one whenever you want to change your withholding.2NJ Division of Taxation. Employee’s Withholding Allowance Certificate (Form NJ-W4) Some triggers to watch for:

  • Marriage or divorce, which changes your filing status and rate table.
  • A new child or dependent, which adds an allowance on Line 4.
  • A spouse starting or leaving work, which changes the rate letter on Line 3.
  • A second job, which usually calls for a Line 3 adjustment and often Line 5 too.
  • A large balance due or large refund on your last return, either of which means the form isn’t calibrated.

What Getting It Wrong Costs

If your balance due exceeds $400 at filing time, New Jersey assesses interest on the amount you should have paid across the year, calculated at 3% above the prime rate and compounded from the date each quarterly estimated payment should have been made. You may need to complete Form NJ-2210 to figure the interest owed.6NJ.gov. Interest on Underpayment of Estimated Tax

New Jersey law also adds a penalty on top of interest for state tax not paid by its due date, and both run until the balance is paid.7Justia Law. New Jersey Revised Statutes 54-49-3 – Interest, Penalty on Unpaid Tax For wage earners, the cheapest way past all of this is Line 3. That’s where most underwithholding starts.