Guide
How to Chase Vendors for Missing W-9s
By Keelstar Team · Updated July 11, 2026
The short answer
Chasing missing W-9s requires a defined escalation sequence — not ad-hoc emails in December. Send an initial secure request at onboarding with a stated deadline tied to first payment. If incomplete after seven days, send reminder one referencing the payment hold policy. At fourteen days, send reminder two with an explicit hold date and copy procurement if they own the relationship. At twenty-one days, activate the payment hold and notify tax leadership for high-dollar or reportable payees. Log every send, open, and bounce in your W-9 collection system — auditors ask what you did when vendors did not respond, not whether you tried once. Phone escalation works for strategic vendors after two unanswered emails. Document the call. For chronic non-responders before year-end, initiate B-notice procedures rather than filing with missing TINs.
Why structured chasing beats year-end panic
Vendors ignore one vague email. A documented sequence with escalating consequences produces higher completion rates and gives auditors evidence of systematic outreach — not last-minute scrambling.
Standard reminder cadence
Publish the cadence in your vendor policy and reference it in every W-9 request email.
- Day 0: Initial secure W-9 request with deadline
- Day 7: First reminder
- Day 14: Second reminder with hold warning
- Day 21: Payment hold activated
- Day 30+: Tax leadership escalation for reportable payees
Payment holds that vendors take seriously
Reminders without consequences get deprioritized. Tie the deadline to invoice release and state the hold date explicitly. Coordinate with procurement so buyers do not promise payment while AP is waiting on tax documentation.
Phone and executive escalation
High-dollar vendors, law firms, and sole proprietors hesitant about SSN sharing may need a phone call after two unanswered emails. Document date, contact, and outcome. Escalate to vendor management or legal for chronic non-responders.
Track outreach in a system of record
Manual Outlook threads do not prove delivery at audit time. Use a W-9 collection platform that logs sends, opens, submissions, and reminder counts per vendor ID.
When chasing fails before year-end
For reportable payees who never respond, follow B-notice and backup withholding procedures. Do not file 1099s with guessed TINs. Hand unresolved cases to tax leadership with payment totals attached before the filing deadline.
Frequently asked questions
- How many reminders should AP send?
- Standard cadence: initial request, reminder at seven days, second reminder at fourteen days with hold warning, payment hold at twenty-one days. Adjust for your policy but document every step.
- Should procurement help chase missing W-9s?
- Yes, for vendors they onboarded. Buyers often get faster responses than AP. Coordinate messaging so vendors receive consistent requirements.
- Can we pay a vendor while chasing the W-9?
- Define exceptions with tax approval. Default should be hold until validated — especially for reportable payees approaching the $600 threshold.
- What if the vendor says they already submitted?
- Check your portal and vendor record first. If truly missing, resend the secure link. If rejected for validation errors, tell the vendor specifically what to fix.
Related guides
Put this into a monitored workflow
W-9 Collector handles this continuously — with reminders and an audit trail.