Most homeowners planning a renovation focus entirely on the contractor's price. Very few ask about sales tax — which is strange, because in New York, whether or not you owe sales tax on a home improvement project can come down to a single piece of paperwork most people have never heard of: Form ST-124.

The basic rule

In New York, contractor labor on a capital improvement to real property is exempt from sales tax. Labor on a repair or maintenance job is not — sales tax has to be collected on that. The difference between those two categories is where the money is, and it isn't always obvious which one your project falls into.

What counts as a capital improvement

New York State uses a three-part test. To qualify, the work generally has to:

  1. Substantially add to the value of the property or meaningfully extend its useful life
  2. Become a permanent part of the property, such that removing it would cause real damage
  3. Be intended as a permanent installation, not a temporary or replaceable fix

A full kitchen remodel, a bathroom gut renovation, a new addition, and a finished basement typically meet all three — which is why these are usually treated as capital improvements. Replacing a broken faucet, patching drywall, or fixing a leak is maintenance or repair, and generally isn't exempt.

How the exemption actually works

The exemption isn't automatic. As the homeowner, you complete Form ST-124, Certificate of Capital Improvement, and give it to your contractor, generally within 90 days of the work being performed. Once your contractor has a properly completed certificate on file, they're not required to collect sales tax on that portion of the job. Without it, they're required to charge you sales tax — even if the work would otherwise have qualified.

In practice, this means the paperwork matters as much as the project itself. A contractor who doesn't mention ST-124 at all, or doesn't build it into the proposal process, is either not passing the savings through or leaving you exposed if the project is ever questioned on audit.

This Is General Information, Not Tax Advice

Whether a specific project qualifies as a capital improvement can be genuinely nuanced, and New York State publishes detailed guidance (Publication 862 and related tax bulletins) precisely because the line isn't always obvious. This article explains the general framework, not a determination for your situation. For anything specific to your project or your tax return, talk to a licensed tax professional or the NY State Department of Taxation and Finance directly.

What this means for your renovation budget

On a $60,000 bathroom or kitchen remodel, the difference between paying sales tax and not paying it is a real number — often thousands of dollars. It's worth asking any contractor, before you sign anything, two direct questions: whether your project qualifies as a capital improvement, and whether they'll walk you through completing Form ST-124 as part of the proposal process.

We build the paperwork into every proposal.

When a project qualifies, we flag it and handle the ST-124 documentation as part of the process — not as an afterthought.

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This article is provided for general informational purposes and does not constitute tax, legal, or accounting advice. Tax rules and their application to specific projects can change and depend on individual circumstances — consult a licensed tax professional or the New York State Department of Taxation and Finance for guidance specific to your situation.