6 Sales Tax Questions Your Search Bar Cannot Answer
Fall has arrived, bringing with it the scent of pumpkin spice, cooler temperatures, and crisper air. It is also the season of going back to school, even for those who finished school a long time ago. While classrooms may be filled with new students, many seasoned professionals find themselves facing a different challenge: admitting there is still something they need to learn.
Here is what rarely gets said out loud. The longer someone works in sales tax, the harder it becomes to ask a basic question. Five years in, ten years in, twenty years in, the assumption takes hold that you should already know this one. So, the question gets typed into a search bar in a late-night panic instead of being discussed out loud with a trusted source.
Unfortunately, the search bar can lead you astray. In the age of AI overviews, it’s even harder to separate fact from fiction. In April this year, the New York Times reported that an analysis of AI Overviews found them accurate about nine times out of ten. More than half of those accurate answers pointed to sources that did not fully back up the claim, which means even the right answers were difficult to verify.
Nine out of ten is a passing grade in a classroom. It is not a passing grade on an audit. Instead of relying on whatever answer the search bar happens to provide, let’s take a closer look at some common sales tax questions and the answers behind them.
What is nexus, exactly?
Nexus is the connection between your business and a state that is strong enough to require you to register, collect, and remit sales tax on taxable sales into the state. The complication is that states recognize more than one kind of connection.
Physical nexus comes from a presence you can point to, such as an office, inventory in a warehouse, an employee working remotely, a contractor installing your product, or attending a trade show in some states. Economic nexus comes from volume alone, measured by sales dollars or transaction counts into a state over a set period.
An important distinction to remember is that economic nexus did not replace physical nexus. Physical presence is still the first test you have to evaluate. States still pursue businesses that had a physical presence and never registered, and those cases often reach back further than economic nexus cases do. And if you have physical presence, it is usually effective as of day one of the presence. The amount of sales doesn’t come into consideration at all!
When does sales tax apply and when is use tax owed?
Sales tax is collected by the seller and remitted to the state. Consumer’s use tax is owed by the buyer when tax should have been charged on a taxable purchase and was not.
Here is why use tax catches so many businesses. Sales tax arrives on an invoice, so someone notices it. With use tax, no vendor bills you for it, no system flags it, and accounts payable pays the invoice exactly as it was sent. The liability accrues silently until an auditor pulls your purchase records and starts marking the untaxed ones.
Common triggers include purchases from out-of-state vendors who are not registered, inventory withdrawn for internal use, promotional items, and materials bought under a resale certificate that never gets resold.
Who actually owes the tax, the seller or the customer?
Both, depending on the state, and the difference matters more than most people expect.
Some states impose the tax on the seller for the privilege of doing business there. The seller owes it whether or not it was ever collected from the customer. Other states impose the tax on the purchaser and make the seller responsible for collecting it. A third group blends the two.
In practice, the state comes after the seller either way. A missed collection does not become the customer’s problem simply because the customer was the one who benefited from the purchase.
It also explains why uncollected tax creates so much additional burden on businesses. Going back to customers months or years later to request tax that should have been charged is uncomfortable at best and impossible at worst. The money usually comes out of margin instead.
If a business never registered, does it still owe the tax?
Yes. The obligation starts when nexus is created, not when the registration is filed.
This is the answer people least want to hear, but most need to. A business that established nexus in a state four years ago and registered last month still has four years of exposure waiting to be resolved. In most states, the statute of limitations does not begin to run until a return is filed, allowing auditors to examine earlier periods indefinitely when no return was submitted.
There is a path forward, and it is a well-worn one. Voluntary disclosure agreements let a business come forward on its own terms, typically limiting the lookback to a defined period and abating penalties. Most states require the approach to come before they make contact and also before the taxpayer is registered, which is why timing matters so much. Additionally, some states offer amnesty programs so taxpayers can come into compliance. For more information on currently available amnesty programs, see the Sales Tax Institute Amnesty Chart.
Is shipping taxable?
Sometimes. The answer turns on four things, and the fourth one surprises people. First, whether the item being shipped is taxable. If the product is exempt, the delivery charge usually follows it. Second, whether the charge is separately stated on the invoice. Many states exempt separately stated delivery charges, which is where the widespread belief that separating the line item solves the problem comes from.
Third, what the charge actually covers. “Shipping and handling” combined into one line is treated as taxable in a number of states even where pure shipping would not be, because handling is a service the seller performs and is considered part of the tax base.
Finally, and often least recognized, how the goods were sold. Some states look at when title passed and who arranged the carrier. A charge for delivery the seller controls can be treated as part of the sales price even when it appears on its own line.
Is a resale certificate the same thing as an exemption certificate?
A resale certificate is a type of exemption certificate, not a synonym for one.
Exemption certificates cover several different reasons a sale is not taxed. Some are based on who the buyer is, such as a government body or a qualifying nonprofit. Some are based on how the property will be used, such as equipment used in manufacturing or agriculture. A resale certificate covers a specific situation: the buyer intends to resell the item rather than consume it.
The distinction shows up in the paperwork, which is why certificate management is so integral to compliance. Different exemptions call for different forms, different information, and different renewal rules. Multistate forms exist and cover many situations, but not every state accepts them for every exemption.
The right document, correctly completed, is what makes an exempt sale defensible. A resale certificate collected for a use-based exemption will not hold up.
One Final Question…
There is a seventh question, and it is the one that actually keeps people awake. What if this has been wrong for years?
It is a fair question, and it has a better answer than most people assume. Exposure can be measured. Penalties can often be abated. Voluntary disclosure exists precisely for businesses that discover a problem and want to fix it before a state finds it first. The worst version of this situation is not the one where someone got it wrong. It is the one where someone suspected they got it wrong and say or do nothing.
That silence usually comes from the same place. Sales tax professionals are frequently the only person at their company who does this work. There is no colleague down the hall to check a gut feeling with, so the question goes to a search bar that answers confidently and cites sources that may not back it up.
The Sales Tax Nerd Community was built for that exact gap. Members post their hardest questions to a private forum of peers, bring the unresolved ones to quarterly office hours with Diane Yetter, and get answers from people who have already been through it. If your company’s sales tax exposure is keeping you up at night, don’t face that fear alone. And don’t rely on a faceless AI or Google answer that “might” be right.