How to Collect W-9s From Vendors and Contractors Before 1099 Season
Missing W-9s are the biggest cause of last-minute 1099 scrambles. Why every contractor needs one, how 24% backup withholding works and a simple year-round process for collecting them.
Quick answer: Form W-9, Request for Taxpayer Identification Number and Certification, is how a business gets a payee's correct name and taxpayer identification number (TIN) so it can file information returns such as Form 1099-NEC. Businesses should collect a W-9 before making the first payment to a contractor or vendor. If a payee doesn't provide a TIN, or the IRS says the TIN is wrong, the payer may have to withhold 24% of reportable payments as backup withholding. Collecting W-9s at onboarding, not in January, prevents most 1099 season problems.
Key takeaways
- Request a W-9 before the first payment, not at year end.
- The W-9 is kept by the business, not sent to the IRS.
- Backup withholding at 24% can apply when a required TIN isn't provided or is incorrect.
- Form 1099-NEC is due February 1, 2027 for 2026 payments, because January 31 falls on a Sunday.
- Accounting firms can prevent January chaos by checking clients' vendor lists for missing W-9s in the fall.
Why W-9s matter
A business that pays contractors and certain vendors must report those payments on information returns, which require the payee's TIN. Without it, the business can't file accurate 1099s. As the W-9 instructions explain, if a payee doesn't return Form W-9 with a TIN, they might be subject to backup withholding, meaning the payer withholds 24% of certain payments and sends it to the IRS.
Who should get a W-9 request?
- Independent contractors and freelancers
- Unincorporated service providers, such as sole proprietors and single-member LLCs
- Landlords receiving rent from the business
- Attorneys receiving fees
- Any payee the business may need to report on a Form 1099
Many businesses simply request a W-9 from every new vendor. It's easier than deciding case by case, and it avoids gaps.
A year-round W-9 process
- Make the W-9 part of vendor setup. No W-9, no first payment.
- Check it on arrival. Name and TIN present, the right tax classification selected, signed and dated.
- Store it securely. W-9s contain Social Security numbers and EINs, so they belong in a secure system, not an email thread.
- Review quarterly. Compare the vendor list to W-9s on file and chase anything missing.
- Request updates when a vendor changes its name, entity type or TIN.
A fall W-9 audit for accounting firms
For firms that prepare 1099s for clients, October and November are the time to act:
- Pull each client's year-to-date vendor payments
- Flag payees likely to need a 1099 (for 2026 payments, the 1099-NEC and 1099-MISC threshold is $2,000, up from $600, under the One Big Beautiful Bill Act)
- Check which ones are missing W-9s
- Send clients one list of the W-9s they still need to collect
This turns a January scramble into a calm December. Add it to your 2027 deadline calendar, since 1099-NEC forms for 2026 payments are due February 1, 2027.
Common W-9 problems
- Name and TIN don't match IRS records: often a business name entered where the owner's name belongs, or vice versa.
- Missing signature or date.
- Wrong tax classification, such as an LLC not indicating how it's taxed.
- Outdated forms from years ago, before the vendor changed entity type.
- W-9s received by email and never filed anywhere.
Sample W-9 request message
Hi [Name], before we can process your first payment, we need a completed and signed Form W-9 for our tax records. You can upload it securely here: [link]. Please don't email it, since it contains your taxpayer ID. Thanks!
Make W-9 collection automatic
W-9s are a document collection problem: request, check, follow up, store securely. Correctdocs handles all four, checking each upload so the wrong form, a W-9 for the wrong business, or missing or unreadable pages are caught right away, and sending reminders until every form is in. For more on building a collection process, see our complete guide to client document collection.
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Frequently asked questions
Do I send Form W-9 to the IRS?
No. The business requesting the W-9 keeps it and uses the information to file information returns.
What is the backup withholding rate?
24% of reportable payments, when backup withholding applies.
When should a business request a W-9?
Before making the first payment to the contractor or vendor.
When are 1099-NEC forms due for 2026?
February 1, 2027, because January 31, 2027 falls on a Sunday.