A Missing W-9 in January Is a Leverage Problem You Created in March
When a vendor refuses to provide a W-9, backup withholding is the employer's tool and obligation. How the W-9 gate works, and how to fix a missing-form scramble.
After a vendor has your money, your leverage to collect their W-9 is almost gone - which is why the form comes before the first payment.
When a vendor refuses to provide a W-9, you have two working tools: the payment gate - no signed W-9, no first payment - and backup withholding, where you withhold a flat percentage of their payments (24 percent at the time of writing; confirm the current rate) and remit it to the IRS until a valid form arrives. Most refusals end quickly once either tool is applied, because the vendor is now funding their own noncompliance.
The deeper problem is usually classification, not refusal. "Northside Plumbing LLC" tells you nothing about whether it gets a 1099, because an LLC can be taxed three different ways - and the answer lives on Line 3 of the W-9, not in the business name.
Who actually gets a 1099
| Check | The rule | The trap |
|---|---|---|
| Payment method | Cash, check, and ACH count toward your reporting; card and PayPal or Stripe are the processor's 1099-K. | Double-reporting card payments the processor already covers. |
| Tax classification | Individuals, sole props, and partnerships are reportable; corporations generally exempt. | Assuming "LLC" means exempt - an LLC can be any of the three. |
| The exceptions | Attorneys and medical providers are reportable even when incorporated. | Skipping the law firm's 1099 because it is a corporation. |
| The threshold | 600 dollars in the cash/check/ACH bucket for most services and rent. | Attorney gross proceeds report at any amount. |
Four mistakes that create the January scramble
The name-TIN validation step deserves respect. The IRS cross-checks every 1099 against its records; mismatches come back as a CP2100 notice, which obligates you to send B-notices on a tight timeline and eventually to withhold. IRS TIN Matching is free through e-Services, and most filing services run the check at submission - never file a known mismatch hoping it slides through.
Twenty vendors paid all year, six missing forms, deadline in three weeks, and zero leverage - the money already left.
W-9 collected with the first invoice, classification recorded, TIN validated the day it arrives, and January becomes a filing task instead of a hunt.
The backup withholding notice you can adapt
Hi [vendor name], we have requested a completed Form W-9 on [dates] and have not received it. Without a valid taxpayer identification number on file, we are required to apply backup withholding of [current rate] percent to your payments and remit it to the IRS, and we cannot release the held amount until a valid W-9 is on file. To avoid this, please return a completed and signed W-9 by [date]. Once we have it, withholding stops going forward.
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Small business example
A general contractor's bookkeeper pulls the vendor list in November and finds a drywall sub paid 18,000 by check with no W-9 - and the sub has stopped answering. The next progress payment goes out with the backup withholding notice attached: a completed W-9 by the stated date, or the required percentage is withheld and remitted. The signed form arrives in four days. The bookkeeper validates the name-TIN combination the same afternoon, catches that the sub is a single-member LLC that should report under the owner's name and SSN, and gets a corrected form - avoiding the classic mismatch that would have surfaced as a CP2100 notice next summer.
Year-end readiness checklist
- Complete vendor list pulled from accounting, bank, and card records - including checks that never hit accounting.
- Payments split by method: cash/check/ACH versus card and third-party processors.
- W-9 status marked per vendor: on file, missing, or invalid.
- Reportability classified from Line 3, with the attorney and medical exceptions applied.
- Name-TIN combinations validated before filing - every reportable vendor, no exceptions.
- New-vendor gate in place: signed W-9 before the first payment, always.
- 1099-NEC filed to recipients and the IRS by January 31; confirmations archived with the W-9s.
FAQ: does a W-9 expire?
No. A W-9 only needs refreshing when the vendor's legal name, entity type, or TIN changes - there is no scheduled expiration. What does change are thresholds, rates, and form editions, so confirm the current-year 1099 instructions with the IRS or your CPA before filing; this is operational guidance, not tax advice.
Free version vs. full kit
This article gives you the free version: the payment gate, the classification table, and the backup withholding notice. The full Vendor W-9 Request and 1099 Setup Kit adds new-vendor and existing-vendor request scripts, TIN-mismatch and B-notice letters, attorney-payment clarifications, year-end confirmations, and a vendor tracker that makes January a non-event.
View the Vendor W-9 Request and 1099 Setup Kit
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