Contractor sales tax by state: where to start

For work across state or local lines, check whether you must register, how that state taxes your scope, and which locality's rate applies. A nearby job can follow different rules from your previous one. Start with the destination state's contractor guidance before pricing or collecting tax.

State and local taxes determine the combined rate

There is no federal sales tax and no national rate. It is a state tax, and in most states one with county, city and special-district taxes stacked on top. These five states do not have a general statewide sales tax, but other taxes can still matter:

"No sales tax state" does not mean "no tax obligation." Check the local rules for an Alaskan job rather than assuming no sales tax applies.

Everywhere else the rate you charge is a stack. These layers are invented to show the shape; yours comes from a rate lookup.

Use the revenue agency's rate lookup for the locality required by its sourcing rules. A county name or ZIP code alone may not identify all local taxes. Look up the applicable rate when quoting, and confirm the rate for the taxable transaction when billing.

Nexus: which states can ask you to collect

Nexus is the connection that lets a state require you to register and collect. It starts whether or not anyone sends you a letter.

Physical presence is the version that catches contractors. An office, a shop, a yard, stored materials, employees — and in most states, doing the work at a location inside the state. Crossing a state line to install, build or repair something is about the strongest fact a state could ask for. Ask the destination state about registration before the first job.

Economic nexus came out of South Dakota v. Wayfair (2018), which let states require sellers with no physical presence to collect on sales volume alone. Nearly every sales tax state now has a version. The test may use sales into the state, a transaction count, or both. The thresholds, what counts toward them and the measurement window have all been amended repeatedly since 2018, and several states have dropped their transaction test entirely. Confirm any figure on the state's own revenue site before you rely on it.

For most contractors this is secondary. You are not shipping to forty states; you are driving to two.

Registering before you collect a dollar

Check permit requirements before collecting tax. New York, for example, requires a Certificate of Authority before making taxable sales. Do not assume a permit in your home state covers work elsewhere.

Check the state's registration instructions, which usually involve these steps:

1. Get an EIN from the IRS if you do not have one. It is free, and eligible applicants can use the IRS online application. Some states let a sole proprietor register on an SSN instead.
2. Register with the state's revenue agency. The name varies — Department of Revenue, Department of Taxation, Comptroller, Tax Commission. Free in many states, a modest fee in others.
3. Wait for the permit number, then start charging. Some states also require you to post the permit at a fixed place of business.
4. Register locally where local tax is separately administered. Most states collect local tax on their cities' behalf. Some do not: Alaska has no state agency to do it, and Colorado's home-rule cities have long self-collected, though the state's SUTS portal now consolidates filing for many of them. Check any separate local filing requirements directly with the revenue agency.

Registration brings a filing calendar, at a frequency the state assigns — usually monthly, quarterly or annually, based on how much you remit. A return is normally due even for a period where you collected nothing, and skipping that zero return commonly carries its own penalty. Some states allow a small vendor discount for filing on time. It is not universal and states do take it away: Colorado eliminated the state-level service fee for filing periods beginning January 1, 2026, leaving some local fees in place.

Whose rate applies: origin, destination, or the job site

Sourcing decides which locality's rate goes on the bill when you and the customer are in different places.

• Destination sourcing generally uses the delivery or other destination specified by the state's rule.
• Origin sourcing uses a qualifying sale location, which may be the seller's business location. The state determines which sales follow that rule; interstate transactions may follow different rules.

Ask the state which sourcing rule applies to work at the job site, counter purchases, delivered materials and off-site fabrication. Do not assume the same address controls all four transactions.

Three more rules decide the invoice

Check three connected questions before setting invoice tax:

• How are material purchases treated? Determine whether you consume the materials or purchase them for resale, including any credit for purchase tax (materials versus labor).
• Is the work you sell taxable? Paying tax to a supplier does not settle tax on your service. New York repair guidance, for example, generally requires purchase tax on materials and tax on the total repair charge; eligible transferred materials can qualify for a credit. Check labor taxability separately.
• Does an exemption apply? Verify the transaction and required resale or exemption certificate.

Set and check the tax rate on each quote

DoneQuote lets you save tax rates, choose a default rate for a service, and change the rate on individual quote lines. It does not look up tax by job-site address. Use the revenue department's lookup and sourcing rules, then review the tax on each quote. Changing a saved service does not correct documents you previously sent.

What to ask your department of revenue

Call, or use the written-guidance request most states offer:

• Does the work I described create nexus here, and from what date?
• Am I registering as a contractor, a retailer, or both under one permit?
• Are improvements to real property treated differently from repairs?
• Which rate applies at a job site outside my home city?
• What filing frequency am I assigned, and are zero returns required?

Write down who answered and when. Then take it to a CPA who works with contractors in your state. Start at the IRS list of state government websites. If you work across several states, the Streamlined Sales Tax Governing Board publishes member states' rules in a common format.