A taxable sale is any transfer of goods, digital products, or specifically listed services in exchange for something of value, where state law requires the seller to collect sales tax on the transaction. Forty-five states and the District of Columbia impose a general sales tax; only Alaska, Delaware, Montana, New Hampshire, and Oregon sit outside the system entirely. The seller collects the tax at checkout and forwards it to the state, essentially acting as a collection agent. What actually falls into the taxable category varies more than most people expect, especially once services, software, and out-of-state online purchases enter the picture.
Physical Goods Are Taxable by Default
Tangible items form the core of every state’s sales tax base. Clothing, furniture, electronics, motor vehicles, building materials, sporting goods, appliances. If you can hold it, the starting assumption in nearly every taxing jurisdiction is that the sale is taxable, and the seller applies the local rate to the sale price unless the buyer produces documentation showing an exemption applies.
That presumption cuts hard against sellers who guess wrong. Fail to collect on a taxable item and you’re generally liable for the uncollected amount plus interest and penalties. States typically have a three- to four-year look-back window for audits, so a misclassification can compound quietly before anyone catches it.
Services Are Usually Not Taxable Unless Listed
Services follow the opposite rule. In the vast majority of states, a service is not taxable unless the legislature has specifically added it to the tax base. Only Hawaii, New Mexico, South Dakota, and West Virginia flip that logic and tax most services by default, carving out exemptions rather than inclusions.
Everywhere else, the question is whether your particular service appears on the state’s list of taxable activities. Common inclusions are auto repair, landscaping, construction labor, dry cleaning, and telecommunications. Professional services like legal advice, accounting, and medical care are rarely taxed. These lists shift with each legislative session, so a service that was tax-free last year may not be this year.
Digital Products and Software
As spending moved from physical media to downloads and streaming, tax codes followed. E-books, music downloads, streamed movies, and online subscriptions are now taxable in a growing number of states. The Streamlined Sales and Use Tax Agreement, with 24 member states, established standardized definitions for “specified digital products” so member states treat these items consistently.
Software as a Service is one of the trickiest areas. Roughly half of all states tax SaaS in some form, depending on whether the state treats remote access as equivalent to buying a software license. The trend runs toward taxing it, and more states add SaaS to the base each year. Sellers need to track where each customer sits, because the tax rate depends on the buyer’s jurisdiction, not the seller’s.
What Legally Counts as a Sale
Not every transfer of property triggers tax. A transaction has to meet two requirements: a transfer of ownership or possession, and something of value given in return. That second element, called consideration, is what separates a sale from a gift. Hand your neighbor a couch for free and no sales tax applies. Sell it for $200 on a marketplace app and it’s a taxable event.
Leases and rentals count as sales for tax purposes even though the customer never permanently owns the property. Each rental payment is treated as a separate taxable transaction, so the lessor collects tax on every monthly installment. That covers everything from car leases to equipment rentals. The paperwork, whether a bill of sale, a lease agreement, or a rental contract, serves as the evidence that a taxable transfer occurred if an auditor asks.
Bundled Transactions
When a seller packages taxable and nontaxable items together for a single price, tax treatment gets complicated. A phone plan that includes a handset (taxable) and a service contract (potentially nontaxable) sold as one lump sum is the classic example.
Most states follow a general rule: if any item in the bundle is taxable, the entire price is taxable unless the seller breaks out each item separately on the invoice. Two common escape hatches exist. Many states apply a “true object” test, meaning that if the real purpose of the transaction is the nontaxable service and the physical product is merely incidental, the whole bundle may be treated as nontaxable. Separately, if the taxable portion accounts for a small share of the total price (often 10% or less), some states treat the entire transaction as nontaxable. Itemizing each component on the invoice is the cleanest way to avoid the question entirely.
Common Exemptions
Certain transactions are carved out of the tax base entirely, either because of what’s being sold or who’s buying it.
The most common is the resale exemption. When a wholesaler sells inventory to a retailer who plans to resell it, the wholesaler doesn’t collect tax; the tax gets collected later when the retailer sells to the final customer. To claim the exemption, the retailer presents a resale certificate at the time of purchase. Without that certificate on file, the wholesaler is liable for the tax as if the sale were to an end consumer.
Government agencies and qualifying nonprofits can often buy tax-free by presenting an exemption certificate or letter to the vendor. Sellers need to keep those documents on file, and most states require retaining them for at least four years. An expired, incomplete, or missing certificate found during an audit typically leaves the seller owing the full tax plus interest out of pocket.
Many states also exempt specific product categories. Prescription medications are exempt in nearly every state with a sales tax. Grocery exemptions have been expanding rapidly: Arkansas, Illinois, Kansas, and Oklahoma all eliminated their state grocery tax between 2024 and 2026, and only about ten states still tax groceries at any rate. A few, like Alabama and Mississippi, have been phasing their grocery taxes down rather than eliminating them outright.
Sales Tax Holidays
Around 20 states run temporary sales tax holidays each year, typically a weekend or a week during which certain categories of purchases are exempt from state sales tax up to a per-item price cap. Clothing, footwear, and school supplies are the most common categories, usually with a per-item threshold around $100. Some states also include emergency preparedness items or Energy Star appliances. Most fall in late July or August, timed to back-to-school shopping. The Federation of Tax Administrators publishes an annual list of participating states and dates.
When Out-of-State Sellers Have to Collect
Before 2018, a state could only require a business to collect sales tax if that business had a physical presence there. The Supreme Court changed that in South Dakota v. Wayfair, Inc., ruling that states can require remote sellers to collect based purely on their economic activity in the state.
Every state with a sales tax has since adopted an economic nexus law. The most common threshold mirrors the one the Court upheld in Wayfair: $100,000 in annual sales into the state, or 200 or more separate transactions. Some states have dropped the transaction count and kept only the dollar threshold. Once a seller crosses the line, registration, collection, and remittance are required going forward. A seller shipping across 30 states could owe obligations in every state where it exceeds the threshold.
Marketplace Facilitator Laws
If you sell through a platform like Amazon, Etsy, or eBay, collection has largely shifted off your shoulders. Nearly every state with a sales tax now requires the platform, not the individual seller, to collect and remit tax on transactions it facilitates. The platform handles rate calculation, collection from the buyer, and remittance to the state.
That doesn’t fully clear you. Sales you make outside the marketplace, through your own website or at in-person events, remain your responsibility. And if a marketplace stops meeting a state’s economic nexus threshold, it may stop collecting on your behalf, pushing the obligation back onto you without much warning.
Use Tax Covers What the Seller Doesn’t Collect
When you buy something taxable and the seller doesn’t charge tax, usually because the seller is out of state and has no obligation to collect, you still owe the tax. That obligation is called use tax, and it exists in every state with a sales tax. The rate matches what you would have paid locally.
Use tax most commonly applies to online purchases from unregistered out-of-state retailers, items bought while traveling, and goods bought from private sellers. Businesses with sales tax permits report use tax on their regular sales tax returns. Individual consumers are supposed to report it on their annual state income tax return, though compliance among individuals has historically been low. If you paid sales tax to another state on the same item, you can usually claim a credit against the use tax you owe so the same purchase isn’t taxed twice.
Which Rate Applies to a Cross-Location Sale
When seller and buyer sit in different locations, the applicable rate depends on whether the state uses origin-based or destination-based sourcing. Roughly 35 states use destination-based sourcing, tying the rate to where the buyer receives the goods. About 11 states use origin-based sourcing, tying it to the seller’s location. Even in origin-based states, sales that cross state lines generally revert to destination-based rules, so the practical benefit of origin sourcing applies mainly to in-state sales.