Sales tax generally applies to retail sales of tangible goods, and to services only when a state specifically chooses to tax them. Use tax is the companion tax owed by the buyer when a taxable item is used in a state but sales tax was not collected at purchase. What is actually taxable for a given business depends on what it sells, what it buys, how it bills, and which states it operates in. Because each state writes its own rules, two businesses doing the same work in different states can have very different obligations. Understanding the patterns in your industry is the first step toward getting both sides, collection and use tax, right.
The stakes are higher than many owners expect. A business that fails to collect sales tax it should have charged typically has to pay that tax from its own funds, often with penalties and interest. A business that never accrues use tax on its purchases can accumulate exposure that surfaces in an audit or during a buyer's due diligence. One thing owners consistently underestimate is that sales tax risk sits on the purchasing side of the business as much as the selling side.
The Core Concepts That Apply Across Industries
A few principles shape sales and use tax for almost every business.
Taxability varies by state. Tangible goods are generally taxable unless exempt. Services are generally not taxable unless a state specifically taxes them, and the list of taxable services differs widely. Digital products and software are treated inconsistently across states.
Exemptions require documentation. Sales for resale, sales to exempt organizations, and certain other exempt sales generally require a valid certificate or other documentation from the buyer. Without it, the seller may be responsible for the tax if the sale is challenged.
Use tax applies to the business's own purchases. When a business buys taxable items from a vendor that does not charge sales tax, such as some out-of-state or online sellers, it is generally expected to report and pay use tax. The same can apply when a business takes items it purchased for resale out of inventory and uses them itself.
Nexus determines where obligations exist. A business may have to register and collect in states where it has a physical presence or exceeds economic thresholds. Those rules have been changing, which makes regular review important (see multi-state tax services).
How Sales and Use Tax Commonly Applies by Industry
The patterns below are general. Actual treatment depends on the state, the specific transaction, and how contracts and invoices are structured.
Construction
In many states, contractors who install materials into real property are treated as the consumers of those materials. That generally means the contractor pays sales or use tax when buying materials and does not charge sales tax to the customer for the installed work. Other states treat certain contractors as retailers, or apply different rules depending on whether the contract is lump-sum or time-and-materials. Equipment rentals, tools, and supplies are commonly taxable purchases. Contractors working across state lines or on exempt projects need to understand how each state treats their contracts, because the default assumption is often wrong.
Real Estate and Property Management
Long-term rent of real property is generally not subject to sales tax in most states, though some states and localities impose taxes on certain rentals. Short-term lodging is commonly subject to sales or lodging taxes. Property managers and owners frequently overlook use tax on supplies, appliances, furniture, and equipment purchased for properties, particularly when those purchases come from out-of-state vendors that do not collect tax.
Professional Services
Many professional services, such as consulting, legal, and accounting work, are not taxable in most states, but some states tax a broader range of services. Complications often arise when a firm also delivers tangible items, digital products, or software, or bills clients for reimbursable materials. Firms also tend to make significant purchases of software, equipment, and supplies, where use tax may apply if the vendor did not charge sales tax.
Medical and Healthcare
Medical services are generally not subject to sales tax, and many states exempt prescription drugs and certain medical devices. However, practices commonly purchase supplies, equipment, and furniture that may be taxable, and use tax may be owed on items bought without tax. Practices that sell retail products, such as skincare, supplements, or certain non-prescription items, may need to collect sales tax on those sales depending on the state.
Restaurants and Food and Beverage
Prepared food is generally taxable, while grocery-type food items are often treated differently or taxed at different rates. Questions frequently arise around delivery fees, service charges, and mandatory gratuities, whose taxability depends on the state and how charges are presented on the bill. When orders come through third-party delivery platforms, marketplace rules may shift collection responsibility to the platform for those sales, so restaurants need to avoid both double collection and gaps.
Not-for-Profit Organizations
A common misconception is that federal income tax exemption automatically means exemption from sales tax. In many states, nonprofits must apply separately for a sales tax exemption, and only certain types of organizations qualify. Even exempt organizations may be required to collect sales tax when they sell goods, such as merchandise or event items, depending on state rules.
Technology
Taxability of software as a service, downloaded software, digital goods, and related services varies more than almost any other category. Some states tax SaaS and digital products, others do not, and some apply partial or different rates. Bundled offerings that combine software, implementation, training, and support raise additional questions about how charges should be separated on invoices. Technology companies selling nationally often need to evaluate both taxability and nexus in many states at once.
Retail and E-commerce
Retailers generally collect sales tax on taxable goods sold to end customers, but online and multi-channel sellers face added complexity. Economic nexus can create obligations in states where they have no physical presence, marketplace facilitator laws may shift collection to platforms for some sales, and states differ on whether shipping charges are taxable and how sales are sourced to a location. Accurate product taxability settings and well-integrated sales tax and accounting systems become essential as volume grows.
Government Services and Contractors
Sales to government entities are often exempt, but that exemption does not always extend to a contractor's own purchases. A contractor buying materials to perform a government contract may still owe sales or use tax depending on the state and the contract structure. Assuming the government's exemption flows through to the contractor is a frequent and costly mistake.
Common Mistakes Across Industries
What we see most often are a handful of recurring issues: collecting tax on exempt sales or failing to collect on taxable ones, accepting exemption claims without valid certificates, never reviewing purchases for use tax, applying one state's rules in another, and not revisiting taxability when the business adds new products, services, or billing methods.
How Do You Know If Your Business Has Exposure?
A question business owners often ask is how to tell whether they have a sales or use tax problem before an auditor does. A practical review looks at what the business sells and how each item is treated in each state where it has obligations, whether exemption certificates are on file for exempt customers, how purchases without sales tax are handled, and whether sales tax liability accounts reconcile to filed returns. If exposure is found, many states offer voluntary disclosure programs that may limit lookback periods and penalties, and the right approach should be evaluated with a tax advisor.
Where to Start
What sales and use tax actually applies to depends on your industry, your transactions, and your states, and the most common problems hide in assumptions that seemed reasonable at the time. Reviewing both what you sell and what you buy is the most reliable way to find gaps before they grow. Secure Accounting can help you evaluate taxability, use tax exposure, and multi-state obligations as part of our tax compliance and advisory services, with guidance tailored to the industries we serve. When you are ready, start a conversation with our team.