Guide
How to Collect W-9 from Marketplace Vendors
By Keelstar Team · Updated July 11, 2026
The short answer
Marketplace and platform payments create confusion about who collects the W-9 and files the 1099. If your organization pays the vendor directly — outside the platform's payment system — you are the payer and must collect Form W-9 and file information returns when thresholds are met. If the platform is the payer of record and issues the 1099, you may not need a duplicate W-9 for the same payments — but document the payment flow in writing. Many organizations pay marketplace vendors directly while also using the platform for discovery; in that case W-9 collection at your vendor onboarding is mandatory. Collect W-9 before first direct payment, validate TIN and classification, and clarify in procurement policy that platform membership does not replace your tax documentation requirements. When in doubt, collect the W-9 — duplicate collection is cheaper than unreportable payments.
Determine payer of record first
Before skipping W-9 collection, answer: who actually disburses funds to the vendor? If your AP system sends payment, you are likely the payer regardless of how you found the vendor. Platform-facilitated payments where the platform issues 1099 may shift obligation — get it in writing.
Direct pay despite marketplace origin
Teams often hire through a platform but pay via ACH or check outside it. That makes you the payer. Collect W-9 at onboarding the same as any other contractor or supplier.
- Document payment flow in vendor record
- Collect W-9 when your AP disburses funds
- Do not assume platform handled tax forms
- Track cumulative payments for 1099 thresholds
W-9 collection for marketplace-sourced vendors
Send secure W-9 requests when the vendor record is created — before first invoice. Marketplace vendors may not expect W-9 requirements; explain the obligation clearly in onboarding email.
1099 filing when you are the payer
File 1099-NEC or other applicable forms using W-9 data when your direct payments exceed IRS thresholds. Do not double-report payments already reported by a platform — reconcile payment sources at year-end.
Procurement policy alignment
Update vendor policy to state that marketplace origin does not exempt vendors from W-9 when your organization pays directly. Train buyers who source through platforms to route vendors through standard AP onboarding.
When platform and direct payments mix
Some vendors receive both platform-processed and direct payments. Track each stream separately. You report only payments you made — but you need W-9 on file for your direct disbursements regardless of platform activity.
Frequently asked questions
- If Upwork or Fiverr pays the contractor, do we need a W-9?
- If the platform is the payer of record and issues the 1099, you may not need a separate W-9 for those platform-processed payments. If you pay the contractor directly, you must collect W-9.
- What about Amazon Marketplace sellers we pay directly?
- Direct payments to sellers require W-9 collection from your organization when you are the payer. Marketplace facilitation rules vary — confirm payment flow with tax.
- Should procurement require W-9 before approving marketplace vendors?
- Yes, when your AP team will pay the vendor directly. Add W-9 to marketplace vendor setup alongside banking and contract requirements.
- Can we rely on the platform's tax documentation?
- Request confirmation of who files the 1099. Do not assume — document the payer of record for each relationship.
Related guides
Put this into a monitored workflow
W-9 Collector handles this continuously — with reminders and an audit trail.