A tax rule that most households have never heard of can take nearly a quarter of a payment before it ever reaches a bank account. It is called backup withholding, and it kicks in when the government cannot match a payment to a correct taxpayer identification number. The mechanism itself is decades old, but a wave of recent changes aimed at gig workers and online sellers has put it back in the spotlight, and it is worth understanding before a payout arrives short.
What backup withholding actually is
Backup withholding is a flat 24 percent that a business or platform must hold back from certain payments and send to the IRS on the recipient’s behalf. It is triggered in a narrow set of situations, chiefly when a payee fails to provide a correct taxpayer identification number, or TIN, or when the IRS notifies the payer that the name and number on file do not match its records. This is not a new tax and not a penalty in the ordinary sense; the withheld money is credited toward the recipient’s eventual tax bill. But it is an immediate, real bite out of cash flow. The rule sits in a long-standing section of the tax code, and the IRS describes it plainly on its backup-withholding page.
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The part that is genuinely long-standing law
It is important to be precise about what is old and what is new here, because the 24 percent figure has been on the books for years. The requirement to withhold when a TIN is missing or wrong is established under a section of the tax code that governs these payments, and it applies to a range of income reported on 1099 forms, including interest, dividends, and payments to independent contractors. A freelancer who never returns a completed Form W-9 to a client, or whose Social Security number does not match IRS records, can already see 24 percent held back. That has been true for a long time and did not change this year.
What actually changed for online sellers
The new development involves how backup withholding interacts with the Form 1099-K, the document that payment apps and online marketplaces use to report a seller’s transactions. Under the One Big Beautiful Bill Act, the tax-and-spending law signed on July 4, 2025, the 1099-K reporting threshold was permanently restored to more than $20,000 in payments and more than 200 transactions in a year. That reversed a planned drop to a far lower threshold that would have swept in casual sellers. The IRS explains the current threshold on its Form 1099-K guidance.
How the proposed regulations tie the two together
With the reporting threshold reset by law, the Treasury Department and the IRS issued proposed regulations to align the backup-withholding rules for payment-platform users with that threshold. The proposal, published in the Federal Register in early 2026 with a public comment period, spells out when third-party payment platforms must apply the 24 percent hold to the people they pay. The practical effect is a cleaner rule: a platform generally is not forced to backup-withhold on a low-volume seller who falls under the reporting threshold, which resolves a mismatch that could otherwise have snared very small sellers on their first dollar.
The catch that overrides the threshold
There is one crucial exception that every gig worker and marketplace seller should understand. Backup withholding overrides the reporting threshold. If a platform is required to backup-withhold on a payee, because the payee gave a wrong TIN or the IRS flagged a mismatch, the platform must file a 1099-K and report those payments regardless of the dollar amount or transaction count. In other words, a seller who never crosses $20,000 or 200 transactions can still end up with a 1099-K and a 24 percent hold if the tax information on file is incorrect. The threshold protects the compliant; it does not protect someone whose paperwork is wrong.
The five-minute fix that avoids the whole thing
Almost every backup-withholding surprise traces back to a name or number that does not match. The defense is simple and worth doing before the busy fourth-quarter selling season: gig, freelance, and marketplace workers should confirm that the legal name and taxpayer identification number on file with each platform exactly match what the IRS has, usually by completing or updating a Form W-9 with the payer. A mismatch as small as a maiden name that was never updated, or a transposed digit, can flip the 24 percent switch. Checking now costs a few minutes; leaving it wrong can mean nearly a quarter of a payout is held back and tied up until it is sorted out at tax time.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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