New York Sales Tax for Contractors: Repair vs Capital Improvement

Short answer: New York sales tax for contractors turns on one distinction. The state taxes repair, maintenance, and installation services to real property, but not capital improvements. Repair a broken step and the whole bill is taxable. Build a deck and it is not — provided the customer gives you a properly completed Form ST-124. Either way, New York treats the building materials you buy as taxable purchases, and you must register for a Certificate of Authority at least 20 days before you begin business.

The line New York draws runs straight through the middle of an ordinary renovation business. The authority is the New York State Department of Taxation and Finance, which sets the rules and issues the certificates; the IRS handles your income tax federally and has nothing to do with any of this. Licensing is a third, unrelated track, handled locally rather than by the state — New York contractor license requirements covers that. This page is about which of your jobs are taxable and what you must hold on file to prove it.

Are contractor services taxable in New York?

Some of them. New York splits work on real property into two buckets, and the tax treatment is opposite in each:

What you did	Sales tax on the job?
Repair, maintenance, or installation service to real property	Yes — taxable
Capital improvement to real property	No — not taxable, with Form ST-124 on file

The state’s own examples are usefully mundane. Repairing a broken step, replacing the thermostat on a hot water heater, and painting existing cabinets are all taxable repair and maintenance work. Building a deck, installing a hot water heater, and installing kitchen cabinets are all capital improvements.

Read those lists side by side and the shape becomes clear. Installing a hot water heater is a capital improvement. Replacing the thermostat on that same heater is a taxable repair. Installing kitchen cabinets is a capital improvement. Painting the cabinets already there is a taxable repair. Same trade, same house, same afternoon — different tax outcome.

What counts as a capital improvement in New York?

The state applies a three-part test, and all three conditions have to be met. An addition or alteration to real property is a capital improvement when it:

1. Substantially adds to the value of the real property, or appreciably prolongs its useful life; and
2. Becomes part of the real property or is permanently affixed to it, so that removal would cause material damage to the property or to the article itself; and
3. Is intended to become a permanent installation.

Failing any one of them puts the job back in the taxable bucket. The middle condition decides most borderline calls: if the thing can be taken out without damaging the building or itself, you are almost certainly looking at a taxable installation rather than a capital improvement.

For the long tail of jobs that do not obviously fall either way, New York publishes a classification catalog — Publication 862, Sales and Use Tax Classifications of Capital Improvements and Repairs to Real Property. It goes item by item. Look up any job type you have not billed before; the answers are frequently counterintuitive, and guessing wrong is a liability you carry, not the customer.

How does Form ST-124 actually work?

This is the mechanism that makes the system run, and it is worth understanding precisely because it shifts the risk.

If you perform a capital improvement and the customer gives you a properly completed Form ST-124, Certificate of Capital Improvement, you do not collect sales tax on the job — and receiving that certificate relieves you of liability for any tax due on the work. You keep it in your records as the reason no tax was collected.

Three habits follow:

• The certificate comes from the customer, not from you. You cannot self-certify a capital improvement. Ask for the ST-124 at contract signing, not as an afterthought when the invoice goes out.
• “Properly completed” is doing real work in that sentence. A blank field or a missing signature is a defective certificate.
• Without one, the exposure is yours. If the state later reclassifies the job as a taxable repair and you never collected tax and never obtained a certificate, the assessment lands on you — long after the customer stopped answering the phone.

The certificate does not make a job a capital improvement, either. It documents a determination that has to be correct on the facts. A homeowner who hands you an ST-124 for a repaint has not converted a repair into an improvement.

Who pays the sales tax on the materials?

You do, on purchase, and this is where New York diverges from what people expect. Building materials and other tangible personal property purchased for capital improvement work are taxable — whether the purchaser is the contractor, a subcontractor, a repair person, or the homeowner.

So the capital improvement exemption is not a whole-job exemption. It exempts the charge to the customer; the materials were already taxed when you bought them. On an exempt capital improvement, the sales tax you paid at the supply house is a cost of the job and has to be inside your number — you will never collect it back.

The instinct of anyone who has sold goods is to reach for a resale certificate here. That instinct is wrong in New York: a contractor cannot buy materials for this work under a resale certificate, because the contractor is treated as the end consumer of them rather than a reseller. Being registered for sales tax does not change it.

There is one limited exception route, and it is narrow by design. Form ST-120.1, Contractor Exempt Purchase Certificate, states on its face that it is “to be used only by contractors who are registered with the Tax Department for sales tax purposes” — and then only for the specific categories it lists. Those include property becoming part of a building owned by an organization exempt under Tax Law section 1116(a), production machinery and equipment incorporated into real property, and property used predominantly in farming or a commercial horse boarding operation. It is not a general-purpose way to buy materials tax free. Read the categories before handing one to a supplier.

When do you have to register with New York State?

If you perform repair and maintenance services to real property, you are making taxable sales, and that means you need a Certificate of Authority. The deadline is not “when you get around to it”: the Tax Department’s own instruction is that you must register at least 20 days before you begin business in New York State.

The certificate is what lets you collect sales tax legally and issue or accept most New York exemption certificates, including ST-120.1. You register through New York Business Express, then file returns on the schedule the department assigns you, whether or not you collected anything.

The awkward case is the contractor who has only done capital improvement work and assumes registration does not apply. The first taxable repair changes that, and the 20-day rule means you cannot fix it on the day the job lands. If repairs are anywhere in your plan, register first.

What rate do you charge, and how does it show on the invoice?

New York’s rate is not one number. It is the state rate plus the local rate for the jurisdiction where the property sits, so a repair in Manhattan and a repair in a rural upstate county are not taxed alike. The location that matters is the job site, not your office — a real complication across county lines. Local rates are changed by the jurisdictions themselves, so look up the current combined rate for each one on the Tax Department’s site in the year you are quoting; do not carry a single rate across your whole customer list, and do not carry last year’s.

On the invoice, show the tax as a separate line rather than folding it into the total, and on exempt jobs note that the work is a capital improvement with an ST-124 on file. What to include on an invoice covers the rest of the fields.

What records does this rule actually demand?

More than most contractors keep. For each job you need to show which bucket the work fell into, the ST-124 if it was a capital improvement, the tax you charged and at what rate, the materials you bought and the tax you paid on them, and the returns you filed. Those records have to survive years, not months — how long to keep tax records sets out the horizon.

That is a record-keeping problem, not a tax-law problem. Keel is an iOS app that keeps those records entirely on the device — no account, no bank connection, no cloud sync, and an App Store privacy label that reads Data Not Collected. It produces invoice PDFs with your own numbering, your logo, and a payment-link QR code; captures supply-house receipts read on-device with Apple Intelligence; logs mileage; and writes everything into an append-only, hash-chained ledger you can export as one file per year or as an Accountant Pack. The free tier is $0 with unlimited invoices, receipts, and mileage; Keel Pro is a one-time $249.99 Lifetime purchase.

Keel does not file your New York sales tax return or calculate your jurisdiction rate — it is a record keeper, not a compliance tool. It keeps the invoice and receipt trail the return is built from. If your material receipts are loose in a truck console, a contractor receipt organizer is where to start.

Frequently asked questions

Is labor taxable for contractors in New York?

It depends on the job. Labor on repair, maintenance, and installation services to real property is taxable, so the whole bill is taxed. Labor on a capital improvement is not, provided the customer gives you a properly completed Form ST-124. New York is unusual in taxing contractor labor at all.

What is Form ST-124 used for?

Form ST-124, Certificate of Capital Improvement, is given by the customer to the contractor on a capital improvement job. With it on file you do not collect sales tax, and receiving it relieves you of liability for tax due on that work. Keep it as the documented reason no tax was collected, and get it signed at contract stage.

Do I pay sales tax on materials in New York?

Yes. Building materials and other tangible personal property purchased for capital improvement work are taxable, whether bought by a contractor, subcontractor, repair person, or homeowner. The capital improvement exemption covers the charge to your customer, not your purchases — so on an exempt job the tax you paid at the supply house is a cost you must price in.

When do I need a New York Certificate of Authority?

Before you start. If you perform repair and maintenance services to real property you are making taxable sales, and you must apply at least 20 days before you begin business in New York State. The certificate is what lets you collect tax legally and issue or accept exemption certificates such as Form ST-120.1.

What sales tax rate does a New York contractor charge?

The state rate plus the local rate for the jurisdiction where the property is located, so the rate follows the job site rather than your business address. Contractors working across county lines cannot use a single rate. Look up the current combined rate per jurisdiction on the Tax Department’s website before quoting, and show the tax as a separate invoice line.

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This article is general information, not legal or tax advice. Rules change — confirm with the authority named above.