In most states, casual private sales of your own belongings fall under an “occasional sale” exemption and carry no sales tax obligation, but the picture changes fast once an auction house, online marketplace, or repeated selling activity is involved. Sales tax on auctions and occasional sales is usually collected by whoever runs the sale rather than by the individual owner of the goods, and the exemption for private sellers has hard limits that trip up people who sell often or in volume. Five states (Alaska, Delaware, Montana, New Hampshire, and Oregon) impose no general sales tax at all. In the other forty-five, whether you owe anything depends on what you’re selling, how often, and through whom.
The Occasional Sale Exemption for Private Sellers
Most states carve out an exemption for sales made by people who are not in the business of selling goods. These “occasional,” “casual,” or “isolated” sales let private individuals sell personal belongings without registering for a sales tax permit or collecting tax from buyers. The tax system is built to capture commercial activity, not the one-off sale of a used couch or an old set of golf clubs.
States define the cutoff differently. Some cap the exemption at one or two separate sales within a twelve-month period. Others use a dollar ceiling, with common limits ranging from $600 to $3,000 in annual gross receipts. A few combine both tests, so exceeding either the transaction count or the dollar figure ends the exemption. Once you cross that line, you have an obligation to register with your state’s taxing authority and start collecting tax on future sales.
Garage sales and yard sales almost always fall inside the exemption because the seller is disposing of used household items on an infrequent basis. As long as you stay within your state’s limits, those Saturday-morning driveway sales are not taxable events. Trouble starts when someone holds sales regularly, maintains inventory purchased specifically to resell, or advertises across multiple channels. At that point revenue departments treat the activity as a business, regardless of how the seller thinks of it.
One important carve-out inside the carve-out: motor vehicles, boats, and aircraft are almost always excluded from the occasional sale exemption. Those follow a separate path, covered below.
When You Cross Into Needing a Permit
You move from occasional seller to retailer when your activity starts to look like a business. Revenue departments look at how frequently you sell, how much revenue you generate, whether you hold inventory bought specifically for resale, and whether you advertise. Thresholds vary by state, but the principle is consistent. Regularly buying and selling goods for profit means you need a permit.
Applying is usually straightforward. You submit an application to the state’s department of revenue with your identifying information, a Social Security number or Employer Identification Number, a description of what you sell, and an expected sales volume. Most states issue the permit at no cost, though a few charge a small application fee, and some require a refundable security deposit from high-volume sellers. The permit authorizes you to collect sales tax and also lets you issue resale certificates when buying inventory.
One warning for sellers who assume they are flying under the radar: online platforms report seller proceeds to the IRS on Form 1099-K when payments exceed $20,000 across more than 200 transactions in a calendar year.1Internal Revenue Service. Understanding Your Form 1099-K That reporting creates a paper trail, and state revenue departments have access to federal tax data. Activity large enough to generate a 1099-K is almost certainly large enough to require a state sales tax permit.
How Sales Tax Works at Auction Houses
If you consign property to a professional auction house, the occasional sale exemption almost certainly does not help you, because the auctioneer’s status controls, not yours. Auction houses are treated as retailers or marketplace facilitators because they manage the sales process, handle payment, and deliver goods to buyers. That classification makes the auction house responsible for collecting and remitting sales tax on every lot, even though the property belongs to a private consignor.
Professional auctioneers hold sales tax permits in each state where they run sales. They apply the correct combined state and local rate to each transaction, verify whether any exemption applies to a particular item or buyer, and remit the collected tax on schedule. From your side as a consignor, the tax side is largely invisible. You receive your proceeds after the house takes its commission and fees, and the buyer paid the tax.
Consignors get tripped up when they assume the auction house always handles it. If you sell at a small, informal auction that isn’t a licensed operation, or if you auction goods yourself at a flea market or fairground event, the tax obligation can fall back on you. Events run by a third party where you pay a booth fee or commission generally don’t qualify for the occasional sale exemption either, because the organized, commercial nature of the event overrides your individual status.
Online Marketplaces Collect for You
The 2018 Supreme Court decision in South Dakota v. Wayfair changed how sales tax works for remote and online sellers. The Court held that states can require tax collection from sellers with no physical presence in the state, as long as there is enough economic connection, defined in that case as $100,000 in annual sales or 200 or more transactions delivered into the state.2Supreme Court of the United States. South Dakota v. Wayfair, Inc., No. 17-494 Every state with a sales tax has since adopted a version of this standard, with most setting the threshold at $100,000.3Tax Foundation. Marketplace Facilitator Laws: Past, Present, and a Better Future
For individual sellers, the practical development is the wave of marketplace facilitator laws that followed. These shift tax collection from individual sellers to the platform. When you sell an item on eBay, eBay calculates, collects, and remits sales tax to the buyer’s state for you. This applies across essentially all states and territories that impose a sales tax.4eBay. Paying Tax on eBay Purchases Other major auction-style and fixed-price platforms operate the same way.
So if you sell personal items through a major online marketplace, you generally don’t need to collect sales tax yourself. The platform handles it. Selling through your own website, at a physical event, or through a smaller platform that isn’t a marketplace facilitator keeps the responsibility with you, and you still have to figure out whether the occasional sale exemption covers your activity.
Vehicles, Boats, and Aircraft
Motor vehicles, boats, and aircraft follow their own collection path in nearly every state. Instead of paying at the point of sale, the buyer pays the tax when applying for a title or registration, typically at a county tax office or motor vehicle agency. That system exists precisely because these high-value assets change hands privately so often that relying on individual sellers to remit the tax would be impractical. You cannot avoid the tax on a used car by buying it from a private party rather than a dealer. The state collects at the title window either way.
Charity and Nonprofit Auctions
Nonprofit status does not automatically exempt an organization from collecting sales tax at an auction. Sales tax applies to sales of tangible goods regardless of who is doing the selling. A silent auction at a fundraising gala, a church rummage sale that exceeds the occasional sale threshold, and a charity’s online auction of donated items are all potentially taxable.
Some states provide limited exemptions for qualifying nonprofits, but these usually come with conditions: a cap on tax-free sales events per year, a specific tax-exempt determination, or a limit on the type of goods sold. The rules vary enough that any nonprofit planning an auction should check with the state revenue department first. Assuming an event is tax-free because the organization has 501(c)(3) status is one of the most common compliance mistakes in this area.
On the buyer’s side, sales tax and charitable deductions are separate matters. A buyer who pays $500 at a charity auction for an item worth $200 may owe sales tax on the full $500 and might also claim a charitable contribution deduction for the $300 excess on their income tax return. Two different taxes, two different sets of rules.
Use Tax When the Seller Didn’t Collect
Sales tax has a lesser-known twin called use tax, and it falls on the buyer. When you purchase a taxable item and the seller doesn’t collect sales tax, you owe use tax to the state where you use the item. The rate matches the sales tax rate that would have applied. Use tax exists so buyers can’t dodge sales tax by purchasing from out-of-state sellers, at estate sales where no tax was collected, or through private transactions.
In practice most individuals never pay use tax on small purchases, because enforcement is difficult and compliance is low. But the obligation is real, and states have grown more aggressive. Many now include a use tax line on the individual income tax return, which makes it easy to report and hard to ignore. For larger purchases like a piece of art bought at a private auction, or equipment bought from an out-of-state seller, the amounts make compliance worth the effort, because an audit that turns up unpaid use tax will include interest and penalties.
If you buy at an auction where the auctioneer collected tax, or from a major online platform that collected tax under marketplace facilitator laws, no additional use tax is due. Use tax only kicks in when tax wasn’t collected at the point of sale.
What Happens if You Get It Wrong
The consequences of failing to collect or remit sales tax go well beyond late fees. Sales tax is considered money held in trust for the state. You collected it from the buyer on the state’s behalf, and failing to turn it over is treated as a breach of fiduciary duty. That distinction matters because the corporate veil does not protect you. Even if your business is organized as an LLC or corporation, states can pursue business owners personally for unpaid sales tax.
Enforcement tools include tax liens on business and personal property, seizure of bank accounts, and in extreme cases criminal charges. An audit that reveals a pattern of uncollected sales tax will produce an assessment for the full amount owed plus interest and penalties. Late filing penalties commonly start at a flat minimum fee or a percentage of the tax owed, whichever is greater, with percentage-based penalties often accruing monthly and most states capping the total penalty between 25% and 35% of the outstanding tax. Interest runs on top of that.
Common audit triggers include revenue that exceeds the registration threshold without a permit on file, a high volume of claimed exempt sales or resale certificate usage, consistently late filings, and connections to other businesses or individuals already under audit. Reports from a competitor, an employee, or a customer also open reviews.
Records That Protect You
Good records are your only real protection in an audit. Every taxable sale should be documented with the date, a description of the item, the sale price, the tax collected, and the buyer’s information. If a sale was exempt, keep the documentation that supports the exemption, whether that’s a resale certificate, evidence of occasional sale qualification, or the specific statutory provision that applies.
The IRS requires that records supporting items on a tax return be kept for at least three years from the filing date, with longer periods for underreported income (six years) or unfiled returns (indefinitely).5Internal Revenue Service. How Long Should I Keep Records State sales tax retention requirements often run three to four years as well, though some states impose longer periods. Keeping records for at least four years covers you in most jurisdictions. Digital copies are fine as long as they are legible and complete.
For auction consignors, the auction house should provide a settlement statement showing the sale price, buyer’s premium, commission, and tax collected for each lot. Hold onto those statements. If the state later questions whether tax was properly collected on your consigned items, the auction house’s records are the primary evidence, and having your own copies protects you if the auction house closes or loses its files.