Yes. Auction houses do report sales to the IRS, and they do it under two separate rules. When the auction platform handles payment between buyer and seller, it files Form 1099-K once a seller crosses $20,000 in gross proceeds and 200 transactions in a calendar year. Separately, any auction house that takes in more than $10,000 in cash from a single buyer must file Form 8300 with the IRS and FinCEN. Neither form is the whole picture: you owe tax on auction gains whether a form gets filed or not, and the amount reported to the IRS is almost never the amount you actually owe tax on.
When a 1099-K Gets Filed
The threshold for third-party settlement organizations, which includes online auction platforms, changed on July 4, 2025 when the One, Big, Beautiful Bill was signed into law. That legislation reinstated the pre-2021 threshold retroactively. A platform is not required to file Form 1099-K unless gross payments to a seller exceed $20,000 and the total number of transactions exceeds 200. Both conditions have to be met.1Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill
Because the change is retroactive, sellers who already received a 1099-K under the lower transitional thresholds may still need to reconcile those forms on their returns.2Internal Revenue Service. Form 1099-K FAQs
One exception matters. When a buyer pays by credit or debit card, the card processor must issue a 1099-K regardless of dollar amount or transaction count. There is no floor for payment card transactions.3Internal Revenue Service. Understanding Your Form 1099-K
When Form 8300 Gets Filed
An auction house that receives more than $10,000 in cash from a single buyer must file Form 8300 with the IRS and FinCEN. The threshold can be crossed in one payment or in related payments that add up over a 12-month period. The rule applies to actual currency and, in many cases, to cashier’s checks and money orders. This is separate from the 1099-K rules and applies to any trade or business.4Internal Revenue Service. Form 8300 and Reporting Cash Payments of Over $10,000
The filing deadline is 15 days after receiving the cash. Since January 1, 2024, businesses that e-file other information returns must e-file Form 8300 as well.4Internal Revenue Service. Form 8300 and Reporting Cash Payments of Over $10,000
What the 1099-K Actually Shows
A 1099-K reports the seller’s name, address, taxpayer identification number, and the gross amount of all reportable transactions. Gross means the full sale price before anything is subtracted. Auction commissions, shipping, refunds, and what you originally paid for the item are all still in that number.3Internal Revenue Service. Understanding Your Form 1099-K
That’s why the form usually looks scarier than the tax bill actually is. Consign a painting that sells for $12,000, and the 1099-K shows $12,000, even if the auction house kept a 25% commission and you received $9,000. If you paid $8,000 for the painting to begin with, your real taxable gain is $1,000. The form to the IRS and the tax you owe are two different numbers, and the records you keep of your purchase price and fees are what bridge them.
If the 1099-K Is Wrong
If the form shows the wrong amount, lists transactions that aren’t yours, or shouldn’t have been sent to you at all, contact the issuer right away. The issuer’s name and phone number are printed in the upper left corner. Keep copies of everything.5Internal Revenue Service. Actions to Take if a Form 1099-K Is Received in Error or With Incorrect Information
If you can’t get a corrected form before filing, report the erroneous amount on Schedule 1 (Form 1040), Line 8z as “Other Income — Form 1099-K Received in Error,” and enter the same amount as an offset on Line 24z. The two entries cancel out, and the IRS sees that you didn’t ignore the form. The same technique works when you sold personal items at a loss: report the gross on Line 8z, offset on Line 24z.5Internal Revenue Service. Actions to Take if a Form 1099-K Is Received in Error or With Incorrect Information
Backup Withholding
If you don’t give the auction house a valid taxpayer identification number, or if the one you give is obviously incorrect, the house must withhold 24% of your proceeds and send it to the IRS. This is backup withholding. It isn’t a penalty; it’s a prepayment of tax that you claim as a credit when you file.6Internal Revenue Service. Publication 7951 – Backup Withholding Due to Missing Payee TIN
What You Actually Owe Tax On
You owe tax on the gain from an auction sale whether or not a 1099-K arrives. Your gain is the sale price, minus selling expenses like the auction commission, minus your basis in the item. Basis is usually what you paid for it, plus any restoration or improvement costs. Buy a desk for $400, sell it at auction for $1,200, pay a $180 commission, and your gain is $620.
How that gain is taxed depends on how long you owned the item. More than one year before the sale is long-term; one year or less is short-term. The count runs from the day after you acquired it through the day of sale.7Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Short-term gains are taxed at your ordinary income rate. Long-term gains on most assets are taxed at 0%, 15%, or 20%. Collectibles work differently: long-term gains on art, antiques, rugs, gems, stamps, coins, and precious metals face a maximum rate of 28%, which is higher than the ordinary long-term rate.7Internal Revenue Service. Topic No. 409, Capital Gains and Losses
One asymmetry catches occasional sellers. Gains on personal-use items are taxable, but losses on personal-use items are not deductible. Sell a piece of furniture at a profit and you owe tax. Sell it at a loss and you can’t offset other income with it.8Internal Revenue Service. Capital Gains, Losses, and Sale of Home
Capital gains and losses from auction sales are reported on Form 8949, which feeds into Schedule D.9Internal Revenue Service. Instructions for Form 8949
Inherited and Gifted Items
A lot of auction sales involve property that was inherited or given to the seller. The basis rules are different from items you bought yourself, and they can dramatically change the tax bill.
For inherited property, your basis is generally the fair market value on the date the previous owner died, not what they originally paid. If your grandmother paid $500 for a painting in 1970 and it was worth $15,000 the day she died, your basis is $15,000. Sell it at auction for $16,000 and only $1,000 is gain. Inherited property is also treated as long-term regardless of how briefly you held it, so long-term rates apply even if you sell within weeks.10Internal Revenue Service. Publication 551 – Basis of Assets
Gifts are trickier. Your basis is generally the donor’s adjusted basis — what they paid, adjusted for improvements. If the item was worth less than the donor’s basis at the time of the gift, a dual-basis rule applies: fair market value at the time of the gift is your basis for calculating a loss, and the donor’s basis is your basis for calculating a gain. When the sale price lands between the two, you have neither. If you can’t document what the donor paid, the IRS may treat your whole sale price as gain.10Internal Revenue Service. Publication 551 – Basis of Assets
Hobby or Business
Whether you can deduct auction fees, restoration work, storage, and travel against your sale proceeds depends on whether the IRS treats your selling as a business or as a hobby. Business sellers report on Schedule C and deduct related expenses. Hobby sellers report income on Schedule 1 but cannot deduct expenses against it. The Tax Cuts and Jobs Act eliminated hobby-related deductions for tax years 2018 through 2025, and even outside that window IRC Section 183 sharply limits them.11Office of the Law Revision Counsel. 26 U.S. Code 183 – Activities Not Engaged in for Profit
The IRS weighs several things: whether you keep business-like records, how much time and effort you put in, whether you depend on the income, whether you’ve adjusted your methods to try to make a profit, and whether the activity has actually turned a profit before. A common rule of thumb is that three profitable years out of five creates a presumption that it’s a business.12Internal Revenue Service. Here’s How to Tell the Difference Between a Hobby and a Business for Tax Purposes
If you’re liquidating a personal collection or handling an estate, hobby classification usually fits. If you’re buying inventory specifically to resell at auction on a regular basis, the IRS will expect you to file as a business.
Foreign Sellers Are Reported Differently
If you are not a U.S. person, this article’s forms are not yours. U.S.-source income paid to a foreign consignor is generally subject to 30% withholding, which a tax treaty may reduce or eliminate.13Internal Revenue Service. Publication 515 – Withholding of Tax on Nonresident Aliens and Foreign Entities Foreign sellers file Form W-8BEN with the auction house to establish foreign status and claim any treaty benefit,14Internal Revenue Service. Instructions for Form W-8BEN and the auction house reports the income on Form 1042-S rather than 1099-K.15Internal Revenue Service. About Form 1042-S, Foreign Person’s U.S. Source Income Subject to Withholding
What Happens If You Leave It Off
The IRS’s matching program compares information returns to what taxpayers report. Skipping income shown on a 1099-K or Form 8300 is one of the easiest ways to get flagged.
The accuracy-related penalty is 20% of the underpayment when the shortfall comes from negligence or a substantial understatement of tax. For individuals, “substantial understatement” means understating tax by the greater of 10% of the correct tax or $5,000. Failing to include 1099-K income is one of the specific examples the IRS lists as negligence.16Internal Revenue Service. Accuracy-Related Penalty
Interest runs on top of that from the original due date of the return. Reporting all auction income, including sales that didn’t generate a form, and keeping documentation of your basis are what keep both penalties and interest off the table.