You invoiced $5,000. The deposit lands, and it says $3,800.

No email came first. No explanation. Your client's accounts-payable system simply took $1,200 and left. You check the invoice, the math, the bank. Nothing is wrong on your side, which is what makes it feel like being quietly robbed by someone who smiled at you in the last meeting.

The money wasn't stolen. It was almost certainly backup withholding, a rule most freelancers never hear about until it happens to them. It's one of the few times the IRS reaches into your payment before you've ever had a chance to say anything.

What backup withholding actually is

When you worked a W-2 job, your employer withheld tax from every paycheck. Freelancing flipped that. Clients generally pay you in full and you send the IRS your own money through estimated payments.

Backup withholding is the exception. It's a flat 24% that a payer is required to subtract from certain payments to non-employees when the IRS doesn't trust the information it has on you. The payer then sends that money to the IRS in your name.

The point isn't to punish you. The IRS can only match income to a person if it has a correct name and taxpayer identification number (TIN). When a payer reports your income without a valid TIN, the paper trail has a hole in it. Backup withholding plugs the hole by collecting some tax up front, "backing up" the normal system that relies on you to report and pay.

It applies to the kinds of payments freelancers actually receive: nonemployee compensation reported on a 1099-NEC, and payments reported on 1099-K or 1099-MISC. Payment platforms and card processors are subject to it too, so it isn't only a risk with one old-school client.

The four ways it gets triggered

Almost none of them involve doing anything shady. They're paperwork failures.

1. You never gave the client a W-9. If a payer asks for your TIN and you don't provide one, they're supposed to withhold. This is the most common trigger. A new client's system flags the vendor as incomplete, and the first payment goes out at 76 cents on the dollar.

2. The name and number don't match. The IRS checks the name and TIN on each information return against its records. If you wrote your business name where your legal name belongs, transposed a digit, or used an EIN with your personal name, you can end up with a mismatch.

3. The IRS sends your payer a "B notice." After a mismatch, the IRS tells the payer to ask you for a corrected W-9. Once the payer gets that notice, they have a short window to reach out to you. If you don't respond in time, withholding begins on future payments.

4. The IRS says you underreported interest or dividends. This one is less about freelance income and more about investment accounts, but it triggers the same 24% on those payments.

Notice what's common to all four: the damage is done by a quiet administrative process, not by an auditor. You can lose a quarter of a payment without ever having been accused of anything.

Why it hurts more than the math suggests

The 24% isn't your tax bill. It's a deposit against your tax bill, and you'll get it back as a credit. So in the long run you haven't necessarily lost anything.

But cash flow doesn't run on the long run. Freelancers live in the gap between money in and bills out, and a surprise 24% haircut hits right there. If you had priced a project to net a specific amount, you now have a hole.

There's also a quieter problem. Money you've mentally earmarked for the IRS has now been collected in a different way, at a different time, and your own estimated-payment plan doesn't know about it. If you keep sending the full amount you planned, you may overpay. If you ignore the withholding, you may confuse yourself at filing time.

How the credit works

The good news is that backup withholding is not a penalty or a separate tax. It's treated like income tax withholding.

The payer reports the amount withheld in box 4 of your 1099-NEC (federal income tax withheld). When you file, you claim it as a payment on your Form 1040, the same line that holds withholding from a W-2.

There's a useful side effect here. Withholding is generally treated as if it were paid evenly across the year, no matter when it was actually taken, unless you elect otherwise. That's different from estimated payments, which count on the day you make them. A big backup withholding amount taken in November can help you meet the safe-harbor thresholds for earlier quarters as well. It's an oddity of the penalty rules, and it works in your favor.

The catch: you only get the credit if the numbers line up. If the payer withheld under one TIN and you file under another, the IRS can't match the credit to you, and you'll be chasing it later with paperwork.

How to stop it

If withholding has already started, you can usually end it. The details depend on why it began.

If you never gave a W-9, give one. A properly completed Form W-9 with your correct name and TIN typically resolves it, and the payer can stop withholding going forward.

If you got a first B notice, the payer will send you a copy of the notice and a blank W-9. Return the signed W-9 and withholding should stop. Do it quickly. The payer's obligation to begin withholding is time-limited, so delays cost you real money.

If you get a second B notice within three years, the process is stricter. A new W-9 alone doesn't fix it. You'll need to get your name and TIN validated through the Social Security Administration or the IRS, depending on the type of number, and give that to the payer.

The money already withheld isn't lost. It gets credited when you file.

Your next moves

  • Send a clean W-9 before the first invoice, not after. Fill it out with your legal name exactly as it appears on your tax return. If you operate as a sole proprietor, your name goes on line 1. A business name belongs on line 2 only.
  • Check that your name and number agree. If you're using an EIN, make sure it's tied to the entity or the name you actually wrote down. Compare your W-9 against your last tax return or an IRS notice.
  • Open every payment platform profile and verify the tax info. Stripe, PayPal, marketplaces and invoicing tools all collect a TIN. Look for any "tax information incomplete" warnings and fix them today.
  • Treat any IRS or client letter mentioning "TIN" as urgent. A request for a corrected W-9 or a CP2100 mismatch notice sent to your payer has a clock on it. Respond within days, not weeks.
  • When a deposit is short, ask before you assume. Email the client's accounts-payable team and ask whether backup withholding applied. Then record the withheld amount against that invoice so you can match it to box 4 in January.
  • Adjust your estimated payments for what's already been collected. If a lot has been withheld this year, you may owe less in your next quarterly payment than you planned.

Don't let a short deposit surprise you twice

The real danger of backup withholding isn't the 24%. It's that it arrives silently, mixes into your records as a mystery discrepancy, and then shows up again months later as a confusing number on a form you barely look at.

That's the kind of thing Payday is built to catch. When you connect Stripe or your bank, it reconciles what you earned against what actually landed, so a withheld chunk shows up as a credit instead of a ghost. Then it folds that credit into your Q1–Q4 estimated payments, so you aren't paying the IRS twice for the same money. If your freelance income is already tangled enough, you can see how it works at payday.lumenlabs.works.