Capital Improvement vs. Repair: The NY Sales Tax Rule Every Contractor Gets Wrong

If you run a construction, remodeling, HVAC, electrical, or plumbing business in New York, one question decides whether you charge your customer sales tax: is this job a capital improvement, or is it a repair?

Get it right and your invoices are clean. Get it wrong and you're either overcharging customers (and losing bids) or carrying a sales tax liability that surfaces in an audit - often years later, with penalties and interest stacked on top.

Here's the distinction in plain English.

What counts as a capital improvement in New York?

New York says a job is a capital improvement when all three of these are true:

• It substantially adds value to the property (or appreciably prolongs its useful life),
• It becomes part of the real property - permanently affixed, so removing it would damage the property, and
• It's intended to be permanent.

Think: a new roof, a kitchen remodel, a new furnace, an addition, new siding, a paved driveway.

When the job is a capital improvement, you do not charge your customer sales tax on the work. Instead, your customer signs Form ST-124 (Certificate of Capital Improvement) and you keep it in your records. That form is your proof for why no sales tax appears on the invoice.

One catch contractors miss: on capital improvement jobs, you are the final consumer of the materials - so you pay sales tax when you buy them at the supply house, and you don't collect any tax from the customer. Your materials cost (tax included) just gets built into your price.

What counts as a repair or maintenance job?

A job is a repair or maintenance when it keeps the property in working condition rather than improving it: fixing a leak, servicing a furnace, patching a roof, replacing a broken window pane, annual maintenance contracts.

Repair and maintenance work is taxable in New York. You charge your customer sales tax on the entire bill - labor and materials. On these jobs you can buy your materials for resale (using a resale certificate) instead of paying tax at the counter, because the tax gets collected from your customer instead.

Why this trips up so many trades businesses

The same task can go either way depending on context. Replacing a few shingles is a repair. Replacing the whole roof is a capital improvement. Fixing a section of fence is a repair. Installing a new fence is a capital improvement.

The most expensive mistakes we see in contractors' books:

• No ST-124 on file. You didn't charge tax because the job was clearly a capital improvement - but without the signed certificate, an auditor can treat the receipts as taxable and assess you the tax you never collected.
• Charging tax on capital improvements. It feels "safe," but it inflates your bids by up to 8% against competitors who invoice correctly, and collecting tax you shouldn't creates its own filing problems.
• Mixed jobs invoiced as one line. A remodel (capital improvement) that includes appliance repair (taxable) needs the taxable piece broken out.
• Paying tax on materials twice - at the supply house and charging the customer - or neither.

What good bookkeeping looks like for NY contractors

Every job in your books should be tagged as capital improvement or repair, with ST-124s filed against the job record and materials purchases matched to the right treatment. That's exactly the kind of structure we build into contractors' QuickBooks files - so when the quarterly sales tax filing comes due, the numbers fall out of the books instead of being reconstructed from memory.

FAQ

Does the customer keep Form ST-124 or do I?

You do. The customer signs it; the contractor keeps it as the record of why sales tax wasn't collected.

What if my customer refuses to sign an ST-124?

Without a certificate, treat the job as taxable - or you're taking on the risk personally.

Do subcontractors charge the general contractor sales tax?

On capital improvement projects, subs generally don't charge the GC sales tax for their work on the improvement; the same capital improvement rules flow through. Repairs are different. When in doubt, get the paperwork straight before the invoice goes out.

Where does New York explain these rules?

NYS Tax Department Publication 862 covers the sales tax classification of capital improvements versus repairs - it's the guide auditors work from.