Usually not your job
Sales tax worries private sellers more than it should, largely because the rules were written for businesses and the language does not obviously exclude anybody. For most people clearing a house, this is not their problem, and it is worth understanding why.
What follows describes structure and names the authorities to check. It is not advice, the rules differ by state, and they change.
The marketplace usually collects it
Over recent years the obligation to collect and remit tax on marketplace sales has moved substantially onto the marketplaces themselves rather than the individual sellers using them. In practice a private seller on a large platform generally finds the tax has been handled without them doing anything.
That does not mean no tax was charged. It means the buyer paid it and the platform remitted it. A seller reading their statement and seeing a tax line should not assume it came out of their proceeds.
Salerooms handle their own
A saleroom selling on a seller's behalf deals with tax on the transaction as part of running the sale. The seller's concern is the commission and charges deducted from the hammer figure, not the tax position of the buyer.
Where a seller is registered as a business this can differ, and it is one of the things worth raising at intake rather than assuming.
Where an obligation can start
The line that matters is between disposing of possessions and operating a business. Somebody selling the contents of a relative's house over a few months is doing the first. Somebody buying stock in order to resell it, consistently, is doing the second, and the second generally brings registration and collection duties with it.
The transition is gradual and there is no single national test, because sales tax is administered at state level. Someone who has started buying specifically to resell should check their own state's position rather than assuming the private-seller treatment continues to apply.
How to check, rather than guess
Each state publishes its own guidance through its revenue authority or comptroller, and those pages are the only reliable source for that state. Search for the state name with the phrase for occasional or casual sales, which is the category most private sellers fall into.
The Texas Comptroller's sales and use tax pages are one example of the form this guidance takes; every state publishes an equivalent and they do not agree with each other. Anyone whose situation is not clearly private disposal should read their own state's version before selling, and should treat choosing where to sell as a guide to channels rather than to obligations.
How to check your own position rather than guess at it
- Start with your own state revenue authority or comptroller. No general article settles it, because sales tax is administered state by state.
- Search for your state name plus the phrase occasional sale or casual sale, which is the category most private sellers fall into.
- Check the date on anything else you read. A great deal of writing on this predates the shift of collection duties onto marketplaces and now gives the wrong impression.
- If you are selling through a marketplace, check whether it states that it collects and remits on your behalf. Most large ones do.
- If you have started buying specifically in order to resell, treat that as the point where the private-seller reading stops being safe and get advice.
Why the rules read as though they apply to everyone
Sales tax guidance is written for businesses, because businesses are who it regulates. The language rarely carves out the person selling a sofa, and a private seller reading it finds nothing that obviously excludes them.
What excludes most people is not an exemption they have to claim but the structure of who collects. The obligation attaches to the person making sales in the course of business, and it has largely been shifted onto marketplaces for sales made through them.
The practical guidance that follows is narrow and worth stating plainly. If you are disposing of things you owned for your own use, through a marketplace or a saleroom, this is almost certainly not your obligation. If you have started acquiring things specifically to sell them, read your own state's guidance, because that is the transition the rules are actually about.
What changed, and why older advice misleads
A good deal of the writing on this subject predates a substantial shift in who collects tax on marketplace sales, and reading it now produces exactly the wrong impression.
The older position put more of the obligation on individual sellers, and articles written then describe registration duties and filing steps that most private sellers now have no reason to touch. Those articles are still online, still confidently written, and still ranking.
The practical defence is to check the date on anything you read about this, including this page, and to treat a state revenue authority's own current guidance as the only source that settles it. Nothing here is advice, and anybody whose situation is not plainly private disposal needs somebody qualified rather than a web page of any vintage.
Common questions
Does selling to a buyer in another state change anything?
For a private seller using a marketplace, generally not, because the platform handles the collection according to where the buyer is. For anyone selling as a business the picture is more complicated and depends on where they have obligations, which is a question for their own state authority and, past a certain scale, for somebody qualified to advise on it.
Does the amount of money involved change whether this applies?
Less than people assume. The distinction the rules turn on is the character of the activity rather than its size: somebody disposing of a valuable inherited collection is still disposing of possessions, while somebody making small regular purchases specifically to resell may be running a business. Scale can be evidence of which is happening, but it is not the test, and state guidance is the place to check.