Plumbers, Cleaners & Contractors: Here's What the Texas Comptroller Actually Says About Your Sales Tax

If you're a plumber, cleaner, or general contractor in Texas — sales tax is probably one of the most confusing parts of running your business. Is your labor taxable? Do you charge tax on materials? What about the rate — is it based on where you're located or where the job is? Let's clear all of this up.

Labor Isn't Always Taxable — But It Depends on the Job

Here's the rule most people get wrong. When you repair or remodel residential property — homes, duplexes, apartments, nursing homes — your construction labor is not taxable. But that same repair or remodel labor on a commercial building is taxable.

There's another layer too — new construction. Whether residential or commercial, labor on brand new construction is generally not taxable the same way repair and remodel labor is. So the real question isn't just "is this commercial" — it's "is this new construction, or is this a repair or remodel job, and is the property residential or commercial."

This is exactly the kind of detail that trips contractors up, and it's worth getting right because charging tax incorrectly — or not charging it when you should — both create problems with the Comptroller down the line.

How You Bill Your Customer Actually Matters

The way you structure your invoice changes your tax responsibility. In Texas you generally have two options:

Lump-sum contracts — one total price for the whole job without separating labor from materials. Under a lump-sum contract, you're considered the consumer — you pay tax on your materials, equipment, and taxable services when you buy them, and you don't charge your customer tax on the total job.

Separated contracts — you itemize materials and labor separately on the invoice. Under a separated contract, you give your suppliers resale certificates instead of paying tax on materials, and you collect sales tax directly from your customer on the materials and certain services.

Neither option is automatically "better" — but how you bill changes who pays the tax and when. This is worth a real conversation with your bookkeeper so you're billing in the way that actually fits your business.

Sales Tax Rate Is Based on the Job Site — Not Your Office

This one surprises a lot of contractors. When you have a separated contract, the jobsite is treated as your "place of business" for tax purposes — meaning you collect city, county, and any special district sales tax based on the location of the job, not where your business is headquartered.

So if your shop is based in San Antonio but you're doing a job in a different county with a different local tax rate — you charge based on that job site's rate, not your home rate. Combined state and local sales tax in Texas can run up to 8.25 percent depending on the jurisdiction, so knowing the correct rate for each job matters more than people realize.

If You Resell Materials at a Markup — That's Taxable Too

Here's a piece a lot of plumbers and contractors miss. If you buy materials, mark up the price, and resell them to your customer — that markup is part of a taxable sale and sales tax applies to the full resale price, not just your cost. When materials are separately stated and titled to the customer, you are reselling those materials and must collect sales tax on the agreed contract price — and that price cannot be less than what you paid for the materials. 

This applies whether you're a plumber marking up parts or a cleaner reselling supplies that get left behind with the client. If money is changing hands on a markup — the Comptroller wants their share of that transaction.

You Need a Sales Tax Permit to Do Any of This Legally

Before you collect a single dollar of sales tax from a customer, you need a Texas Sales and Use Tax Permit from the Comptroller's office. This isn't optional and there's no fee to apply. Once approved, the Comptroller will let you know whether you'll file monthly or quarterly based on your sales volume.

Operating without a permit while collecting or owing sales tax puts you at risk for back taxes, penalties, and interest — and that exposure starts from the date you should have registered, not the date you actually do.

The Bottom Line

Sales tax rules for contractors, plumbers, and cleaners in Texas are detailed and the Comptroller does not make exceptions for "I didn't know." Getting your billing structure, tax rates, and permits right from the start protects your business and keeps you from a painful surprise down the road.

If you're not 100% sure your invoicing and sales tax setup is correct — let's talk before it becomes a bigger problem.

Book a Free Consultation and let's make sure your business is set up the right way.