Gig platforms and freelance marketplaces ask new workers for a tax identification number before they release payment, and the request is easy to ignore or fumble. Skipping it carries a steep cost. When a payer does not have a correct taxpayer identification number on file, federal law requires the company to hold back nearly a quarter of every payment and send it to the government, a rule known as backup withholding.
What Triggers the 24% Hold
The rule comes from section 3406 of the tax code. The Internal Revenue Service sets the backup withholding rate at 24% of reportable payments, which include nonemployee compensation, interest, dividends, rents, and payments processed through many gig and freelance platforms. The most common trigger is a payee who fails to furnish a taxpayer identification number, or who supplies one that does not match agency records.
The withholding is not a penalty in the usual sense. It is a prepayment of tax the worker can recover, but only after filing a return, which means the money is out of reach for months while the worker waits for a refund.
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The Form W-9 That Prevents It
A properly completed and signed Form W-9 is what stops backup withholding before it starts. According to IRS Topic No. 307, furnishing a correct taxpayer identification number and certifying it under penalty of perjury lets a platform pay in full. For most individuals the number is a Social Security number; workers operating as a business may use an employer identification number instead. A single digit entered wrong on the form can be enough to flip the account into withholding.
When the IRS Forces a Payer’s Hand
Backup withholding can also begin after the fact. If the agency sends a payer a notice, commonly a CP2100 or CP2100A, flagging that a name and number do not match, the company must start withholding on future payments to that worker within a set window. The IRS notes in its taxpayer fast facts that repeated underreporting of interest or dividends can trigger the same result, so the rule reaches beyond gig work into ordinary bank and brokerage accounts. Before the withholding starts, the payer must send the worker a written request, often called a “B” notice, asking for a corrected taxpayer identification number. A worker who returns a signed, accurate certification promptly can head off the hold, but ignoring the notice leaves the company legally required to divert 24 percent of the next payments.
How Fast the Hold Adds Up
The size of the bite becomes clear with real numbers. A freelancer invoicing $4,000 a month through a platform that has no valid taxpayer identification number on file loses $960 of each payment to backup withholding, roughly $11,500 over a year, none of which can be spent until a return is filed and any refund is issued. The withheld amount is reported to the worker on a Form 1099 and credited against the final tax bill, so it is not lost outright. It is simply frozen with the government for months. For a worker who depends on steady cash flow, losing nearly a quarter of every payment to a paperwork gap can be more disruptive than the eventual tax itself.
Correcting the Record Stops It
Once withholding begins because of a mismatch, it does not lift on its own. The IRS guidance on backup withholding directs a worker who receives a mismatch notice to supply the correct name and taxpayer identification number, and in some cases to verify the number with the Social Security Administration, before a payer can stop diverting payments. A worker who cannot locate a Social Security number can request a replacement card from the Social Security Administration, and a business owner can confirm or obtain an employer identification number directly from the IRS. The credited withholding still counts toward the year’s tax, so nothing is forfeited, but the delay between correcting the paperwork and recovering the cash is the real cost. Payers are required to withhold until the corrected certification is in hand, which is why acting on the first notice rather than the second saves the most money.
Why It Reaches Retirees Too
Backup withholding is not limited to younger freelancers. Older Americans who consult, drive, sell online, or open new interest-bearing accounts fall under the same section 3406 rules. A retiree who lets a brokerage account certification lapse, or who ignores a platform’s request for a W-9, can watch 24% of each payment vanish until the paperwork is corrected. The fix is administrative rather than financial: confirm that every payer holds a current, correct taxpayer identification number, and respond to any mismatch notice promptly rather than letting the withholding compound across payments.
This article was produced with AI assistance and reviewed by The Financial Wire editorial team.
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Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
