Backup Withholding

Backup withholding is a requirement that a payer deduct federal income tax from certain reportable payments and remit it to the IRS, imposed by section 3406 of the Internal Revenue Code. The section's heading is exactly the term. It exists because most of the payments it covers, interest, dividends, contractor fees, royalties and the like, are normally paid gross on the assumption that the recipient will report and pay the tax themselves. Where the IRS has reason to doubt that assumption, section 3406 turns the payment stream into a withholding stream until the problem is fixed.

The important framing point is that this is not a penalty. It sits in the withholding chapter rather than the penalty chapter, there is no reasonable-cause defense to it because there is nothing to excuse, and every dollar withheld is reported on the information return and credited against the recipient's tax for that year. What it costs is cash flow and inconvenience, not money.

Four triggers, and two of them are narrower than the other two. Section 3406(a)(1) lists them: "(A) the payee fails to furnish his TIN to the payor in the manner required, (B) the Secretary notifies the payor that the TIN furnished by the payee is incorrect, (C) there has been a notified payee underreporting described in subsection (c), or (D) there has been a payee certification failure described in subsection (d)." Then section 3406(a)(2) narrows the field: "Subparagraphs (C) and (D) of paragraph (1) shall apply only to reportable interest or dividend payments."

That last sentence does real work. A freelancer's Form 1099-NEC payments can be backup-withheld for a missing or incorrect taxpayer identification number, and not for underreporting, because the underreporting trigger reaches only interest and dividends. Getting this backwards over-warns a very large audience. The IRS labels the two live routes with its own program names: BWH-B for the identification-number problems and BWH-C for the underreporting and certification problems.

Where the 24 percent actually comes from, and why it will not change on its own. Section 3406(a)(1) does not state a rate. It requires the payer to withhold "a tax equal to the product of the fourth lowest rate of tax applicable under section 1(c) and such payment." Section 1(j)(2)(F) redirects any reference to a rate under subsection (c) to "the corresponding rate bracket under subparagraph (C) of this paragraph", and the section 1(j)(2)(C) table for unmarried individuals runs 10, 12, 22, 24, 32, 35 and 37 percent. The fourth lowest of those is 24, and the IRS confirms the result on its own page: "There are situations when the payer is required to withhold at the current rate of 24 percent."

Two consequences follow. First, the rate moves only if Congress rewrites the individual rate schedule; the annual inflation adjustment moves the bracket thresholds and leaves the rate alone. Second, and this is where older writing goes wrong, the section 1(j) machinery used to expire. It applied to taxable years "2018 through 2025", and its lapse would have sent the section 3406 reference back to an older table and a 31 percent rate. Public Law 119-21, enacted in July 2025, struck that sunset: section 1(j)'s heading now reads "Modifications for taxable years beginning after 2017" with no closing date. So the widely repeated statement that backup withholding returns to 31 percent is describing a reversion that will not happen.

The threshold, and the thing it is not. For payments reportable under sections 6041(a) or 6041A(a), the general trade-or-business reporting provisions, section 3406(b)(6)(A) treats a payment as reportable for this purpose only once the year-to-date total to that payee "equals or exceeds the dollar amount in effect for such calendar year under section 6041(a)", which is $2,000. That figure was substituted for a flat $600 by Public Law 119-21, which is the same amendment published material on Forms 1099 describes as conforming the two thresholds.

It is not "the 1099 threshold", and treating it as one is actively misleading. Information returns with their own statutory thresholds are untouched by it: interest, dividends and original issue discount are reportable from $10, and other returns have their own figures. So a payee told that nothing under the general threshold can be backup-withheld, who then receives reportable interest or dividends, has been told the wrong thing. Section 3406(b)(5) separately excludes, to the extent regulations provide, any payment that does not exceed $10 and would not exceed $10 over a year.

The threshold has two side doors. Section 3406(b)(6)(B) and (C) make a payment reportable regardless of the current year's total where the payer "was required under section 6041(a) or 6041A(a) to file a return for the preceding calendar year with respect to payments to the payee", or where the payer made backup-withheld payments to that payee during the preceding year. A history of reporting therefore carries forward, and a payee can be inside backup withholding this year on last year's record.

Payment-card and platform settlements have their own two-part test. Section 3406(b)(8)(A), added in 2025, treats a payment in settlement of a third-party network transaction as reportable for backup withholding purposes "only if" both the aggregate number of transactions exceeds the number specified in section 6050W(e)(2) and the aggregate amount exceeds the dollar amount specified in section 6050W(e)(1). Both prongs, and both by cross-reference, which is why the figures belong on the page that owns section 6050W rather than here. An exception at (b)(8)(B) switches the test off where any of the prior year's platform payments to that payee were reportable.

What it reaches, and what it does not. The IRS's own list of payments subject to backup withholding covers most kinds reported on Forms 1099 and W-2G: contractor fees and commissions, attorney's fees and gross proceeds paid to an attorney, interest, dividends, rents, royalties, broker and barter exchange proceeds, patronage dividends where at least half the payment is in money, fishing boat proceeds representing a share of the catch, payment card and third-party network transactions, certain government payments, original issue discount paid in cash, and gambling winnings. The exclusions are just as worth knowing, because they are whole categories rather than edge cases: real estate transactions, foreclosures and abandonments, cancelled debts, distributions from Archer MSAs, long-term care benefits, distributions from any retirement account, distributions from an employee stock ownership plan, fish purchases for cash, unemployment compensation, state or local income tax refunds, and qualified tuition program earnings. Section 3406(b)(7) adds a narrow carve-out of certain redemption payments from the underreporting and certification triggers.

How it starts, and how it stops. It usually starts with paperwork. The IRS's own instruction is that on opening an account, making an investment, or beginning to receive reportable payments, "you must furnish your TIN in writing to the bank or other business and certify under penalties of perjury that it's correct", normally on Form W-9, Request for Taxpayer Identification Number and Certification. For an account that will earn interest or dividends there is a second certification: that you are not subject to backup withholding for previous underreporting. Stopping it means removing the cause, and the IRS lists the routes: "providing the correct TIN to the payer, resolving the underreported income and paying the amount owed, or filing the missing return(s), as appropriate." Because the withholding is a symptom, arguing with the payer achieves nothing; the payer is under compulsion and has no discretion.

Claiming it back. The withheld amount appears in the federal income tax withheld box of the relevant Form 1099 or W-2G, and the recipient reports it on the return for the year the income was received. Where the withholding exceeds the tax on that income, the difference is refunded like any other over-withholding. Publication 1335, Underreporter Backup Withholding Questions and Answers, is the IRS's own treatment of the underreporting route.

1. Something breaks the assumption that the payee will self-report. No taxpayer identification number was furnished, the one furnished does not match IRS records, or the IRS has notified the payer of underreported interest or dividends.

2. The payer withholds 24 percent of each reportable payment from then on and remits it to the IRS. The payer has no discretion in this.

3. The withheld amount is reported in the federal income tax withheld box of the Form 1099 or W-2G for that year, with a copy to the payee.

4. The payee fixes the cause. A correct Form W-9 for an identification-number problem; resolving the underreported income, or filing the missing returns, for the underreporting route.

5. Withholding stops once the payer is notified the problem is cleared.

6. The payee claims the credit on the return for the year the income was received, and any excess over the tax is refunded.

A hypothetical example, with made-up figures. Suppose Sofia does contract design work and is paid $9,000 during the year by one client. She never returned a Form W-9, so the client has no taxpayer identification number for her and must apply backup withholding. At 24 percent, $2,160 of the $9,000 goes to the IRS and $6,840 reaches her. The client reports the $9,000 as nonemployee compensation and the $2,160 as federal income tax withheld.

When she files, the $9,000 is included in her income and the $2,160 is a credit against her tax. If the tax attributable to that work, income tax and self-employment tax together, comes to $1,150, the $2,160 credit covers it and the remaining $1,010 is refunded. Nothing was forfeited; she simply lent the government $2,160 for up to a year and a half and got $1,010 of it back. Note what a differently placed trigger would have done: if instead the IRS had notified the client of underreported interest, that trigger would not reach her contract payments at all, because section 3406(a)(2) confines the underreporting and certification triggers to reportable interest and dividend payments.

The parties experience this differently, so the honest framing is by side.

For the payee

• Nothing is lost. Every dollar withheld is credited on the return and any excess is refunded.
• There is no penalty layered on top and no reasonable-cause showing to make, because it is not a penalty.
• The cure is usually a single form. Returning a correct Form W-9 ends the identification-number version.
• Whole categories of payment are outside it, including retirement distributions, cancelled debts and real estate transactions.
• Against that, cash flow takes an immediate 24 percent hit on gross payments, which for a contractor with thin margins can exceed the eventual tax by a wide margin.
• The money is unavailable until the return is filed, which can be well over a year later.
• Two of the four triggers are outside the payee's direct control, since they depend on IRS notices to the payer.
• The payer cannot waive it, so there is nobody to negotiate with.

For the payer

• It provides a defined response to a missing or invalid identification number rather than a judgment call.
• It is mechanical: a flat rate on reportable payments, with the thresholds and exclusions set by statute.
• Against that, the obligation is the payer's and the consequences of getting it wrong fall on the payer, not the payee.
• The threshold rules carry a year of history forward, so a payee who was reportable last year may be reportable this year at any amount.
• Platform and payment-card settlements run on a separate two-part test measured by both transaction count and dollar volume.