How to Handle a Missing W-9 at Year-End

Why missing W-9s surface in December

Throughout the year, AP processes invoices with informal exceptions — 'we'll get the W-9 later.' Later becomes December when finance runs 1099 prep and discovers hundreds of gaps. Vendors acquired mid-year, one-time contractors, and new suppliers onboarded outside procurement are frequent culprits.

Step 1: Quantify the gap

Pull a report of vendors with reportable payments year-to-date and no validated W-9 on file. Sort by payment amount descending — the top of the list is your risk concentration. Separate domestic vs foreign payees; foreign vendors need W-8 forms, not W-9s.

Step 2: Urgent, tracked outreach

Send secure W-9 requests with a clear deadline — not a passive email blast. Use templates that explain 1099 reporting obligations and what happens if the vendor does not respond. Log sends, opens, and submissions. Phone follow-up for high-dollar payees is appropriate.

• Prioritize payees at or above $600 in reportable payments
• Request corrected forms for failed TIN validations, not just missing ones
• Set internal cutoff at least two weeks before filing software lock
• Escalate unresponsive vendors to tax and legal

Step 3: Validate before you file

As W-9s return, validate immediately — do not batch them for January 30. Run TIN matching where available. Update vendor master before generating 1099 drafts. A last-minute W-9 with a typo is as bad as no W-9 if you do not validate.

When vendors still do not respond

If a payee will not provide a TIN, consult your tax advisor on filing obligations, backup withholding on future payments, and whether you have sufficient documentation for reasonable cause relief from penalties. Continue documenting outreach — IRS penalty abatement often hinges on good-faith efforts shown in records.

Fix the root cause before next year

Year-end fire drills are expensive. Gate new vendor payments on W-9 completion, monitor stale forms, and give AP visibility into tax document status year-round. The January pain is a symptom; the disease is unmonitored collection.