Most of what changes for a tradesperson in New Jersey is set by the state, not Washington: how you get paid, whether you need to register, and what you owe in tax. Here is what actually differs, and where to run your own numbers.
Each section below points to a tool that runs your exact numbers for New Jersey.
Tax in New Jersey
New Jersey has a graduated state income tax that runs up to 10.75% at the top, on top of your federal taxes. Graduated means the rate climbs as your profit does, so a good year costs proportionally more. You owe federal income tax and self-employment tax as well, and you make estimated payments to both New Jersey and the IRS through the year.
On sales tax, New Jersey follows the usual rule for the trades: your labor is not taxed, and you pay sales tax on your materials when you buy them rather than charging it to the customer. Capital improvements exempt from collection; routine repairs taxable.
Work out what to hold back on the Tax Set-Aside Calculator, which runs the federal and self-employment numbers for New Jersey.
Getting paid: liens and retainage
A mechanic's lien is the tool that actually gets a New Jersey contractor paid, and in New Jersey you generally have to record it within 90 days of your last day of work, services, materials or equipment. Miss it and you lose the lien, so the dates matter.
Enforcing it has its own clock. 1 year from your last day of work, not from the date you filed the lien, which is where several published summaries get New Jersey wrong. A written demand from the owner or contractor cuts it to 30 days. Work out your dates on the Lien Deadline tool, and if they are close, get an attorney to confirm them against the statute (N.J.S.A. §§2A:44A-6a(2), 2A:44A-6d, 2A:44A-14a(1), (2), 2A:44A-21b(1), (3)).
On money held back as retainage, here is where New Jersey lands:
- Private work: No statutory cap on private work in New Jersey. Whatever your contract says governs, so read the withholding clause.
- Public work: 2% of each partial payment where contracts exceeding $100,000 for construction, reconstruction, alteration or repair of a building, structure, facility or improvement to real property, where the contractor agreed to withholding rather than posting a bond. 2% of partial payments of the total contract price. 5% of each partial payment.
- Release: Private: 30 days from the billing date; the billing is deemed approved and certified 20 days after the owner receives it unless he provides a written statement of the amount withheld and why. Public, county and municipal: 45 days (the statute does not say whether these are calendar or business days) from the final acceptance date agreed upon by the contractor and the contracting unit.
- Prompt pay: A prime must pay a subcontractor within 10 calendar days of receiving each periodic payment, final payment or retainage, unless the parties have agreed otherwise in writing. Late payment carries the prime rate plus 1% from the day after it fell due.
Check the size of the job before you check the percentage. New Jersey's cap does not reach every contract. The condition on it, in the statute's own terms: contracts exceeding $100,000 for construction, reconstruction, alteration or repair of a building, structure, facility or improvement to real property, where the contractor agreed to withholding rather than posting a bond.
Whether the rule covers your job at all is a separate question from the percentage. Public, school boards: the contractor does not have a performance bond; with a bond the rate is 2% while the outstanding contract balance exceeds $500,000, and 5% once it is $500,000 or less.
And the step-down is not the same thing as a right. New Jersey cuts the rate to 1% when substantial completion of the contract, as defined by department rules. That drop is automatic once the condition is met, so it is money you are entitled to have back before the end of the job. Separately, and in the other direction, the commissioner may at his discretion raise the withholding to 4% of the payment due if work is not progressing.
Heads up: State highway retainage has a rate but no release deadline: §27:7-34 names completion and substantial completion as events and sets no day-count for final release. School-board release timing could not be located either.
Check the Retainage Calculator before you sign a contract that holds back more.
Free New Jersey retainage letters
Three letters written for New Jersey's rules, with the state's own release clock and its statutory citation already in them. Fill one in on screen and download it as a PDF or a Word file.
- Retainage Release Request (New Jersey), for when the job is done and the money has not come back
- Retainage Overdue: Demand for Payment (New Jersey), for when the release date has passed and nothing has arrived
- Retainage Held Above the Cap: Challenge Letter (New Jersey), for when more is being held than the state appears to permit
Do you need a license in New Jersey?
New Jersey does not make you sit a full contractor license, but it does require you to register with the state before you work. Registration is lighter than a licensing exam, but skipping it can cost you: in a lot of states an unregistered contractor cannot even sue to get paid. The requirement: Home Improvement Contractor registration. The new licensing regime is INOPERATIVE until six months after the Board promulgates rules, no calendar date applies. It is handled by NJ Division of Consumer Affairs.
Trade licenses for electrical, plumbing and HVAC are usually separate and often required even where a GC license is not. See what applies to your trade on the Contractor License Checker.
Building codes and permits
New Jersey adopts its building codes statewide, so the rules travel with you across the state. Editions still move, so confirm yours with the building department before you price a job.
- Homes: 2024 (N.J.A.C. 5:23-3.21, effective 17 August 2026)
- Electrical: 2023, with TIAs 1 to 13 (N.J.A.C. 5:23-3.16, effective 17 August 2026)
- Energy: 2024 for low-rise residential / ASHRAE 90.1-2022 for commercial and other residential (N.J.A.C. 5:23-3.18)
- Plumbing: 2024 National Standard Plumbing Code, not the IPC or UPC (N.J.A.C. 5:23-3.15)
New Jersey does not run one edition across the whole job, and the energy code is where it splits: 2024 for low-rise residential / ASHRAE 90.1-2022 for commercial and other residential (N.J.A.C. 5:23-3.18). That matters more than the number itself. If you work on houses, the residential edition is your book, and the single figure quoted in most adoption charts is the commercial one.
New Jersey runs one Uniform Construction Code statewide and no municipality may adopt, amend or substitute a different edition of any subcode: the Commissioner of Community Affairs is the sole adopting authority and local offices only administer and inspect against the state text. So there is no jurisdiction here that has adopted nothing. The whole stack turned over on 17 August 2026, so anything you priced earlier in the summer was on the previous editions. Note the plumbing subcode is the National Standard Plumbing Code rather than the IPC or UPC, which is unusual and catches out contractors working across state lines.
Source: N.J.A.C. 5:23, adopted by the Department of Community Affairs under the State Uniform Construction Code Act, N.J.S.A. 52:27D-119 et seq.; DCA Current Construction Codes table. Read against that source on 2026-08-25.
Check a specific job on the permit tool.
Pay and workers' comp
The minimum wage in New Jersey is $15.92 an hour. Seasonal employment and employers of fewer than 6 people: $15.23. That is the floor for anyone you put on the books, and it is worth confirming against the state labor department each year because several states step their rate mid-year. Check a rate on the minimum-wage tool.
On workers' comp, the rule that catches people out in New Jersey is who has to be covered. In construction, corporate officers are automatically included and cannot exclude themselves. Get a premium range for your trade on the Workers' Comp Estimator.
If a client will not pay
If a client will not pay, you can sue for up to $5,000 in New Jersey's Small Claims, Special Civil Part. That covers most unpaid-invoice disputes for a small outfit; a bigger claim goes to regular civil court where you will probably want an attorney. Walk through whether filing is worth it on the Small Claims checker.
The clock runs the other way too: a client generally has 6 years to sue you over the work under a written contract in New Jersey, with an absolute cutoff 10 years after the job is substantially complete. Work out your exposure on the Warranty & Claim Deadline tool.
Common questions
How much state income tax will I pay in New Jersey?
New Jersey has a graduated rate up to 10.75% state income tax on your profit, on top of federal income tax and self-employment tax. Use the Tax Set-Aside Calculator to see what to hold back.
Do I need a contractor's license in New Jersey?
New Jersey does not require a full license but does require you to register with the state first. The requirement: Home Improvement Contractor registration. The new licensing regime is INOPERATIVE until six months after the Board promulgates rules, no calendar date applies. Working unregistered can stop you suing to get paid.
What is the small claims limit in New Jersey?
You can sue for up to $5,000 in New Jersey's Small Claims, Special Civil Part. The filing fee is typically $35 to $40. Larger claims go to regular civil court.
How long do I have to file a mechanic's lien in New Jersey?
Generally 90 days from your last day of work, services, materials or equipment. Miss it and you lose the lien. Work your own dates out on the Lien Deadline tool.
How much retainage can be held back in New Jersey?
Public, county and municipal: 2% of each partial payment where contracts exceeding $100,000 for construction, reconstruction, alteration or repair of a building, structure, facility or improvement to real property, where the contractor agreed to withholding rather than posting a bond. Public, transportation: 2% of partial payments of the total contract price. Public, school boards: 5% of each partial payment. The condition on it, in the statute's own terms: Public, school boards: the contractor does not have a performance bond; with a bond the rate is 2% while the outstanding contract balance exceeds $500,000, and 5% once it is $500,000 or less. Run your own figure on the Retainage Calculator.
Are there free New Jersey contract and payment forms?
Yes. This page links 3 retainage letters written to New Jersey's own release clock and carrying its statutory citation. They are free, there is no sign-up, and you fill one in on screen and download it as a PDF or a Word file.
What is the minimum wage in New Jersey?
$15.92 an hour in New Jersey, above the federal $7.25. Several states step their rate mid-year, so confirm it before you set a payroll.
The honest bit
These are the 2026 rules for New Jersey as they stood when this guide was written, and they change: legislatures move thresholds, deadlines and rates every year. Treat this as general guidance to point you in the right direction, not legal, tax or financial advice. Verify anything you rely on at the source (the IRS, the New Jersey tax and licensing agencies, and your local building department) or with a professional. Where New Jersey does something unusual, the detail is called out above rather than glossed over.
Related: Tax Set-Aside Calculator · Mechanic's Lien Deadline · Contractor License Checker · Small Claims checker · Working in Your State
Know someone who needs this?
Keep reading
Templates you might need
Was this guide useful?
Didn't find what you were looking for?
Spotted something wrong or out of date? Email us at hello@kilnguides.co.uk.
In crisis? 988 Suicide & Crisis Lifeline 988 ·