W-9 Vendor Collection Guide for 1099 Compliance

A W-9 is the foundation of 1099 compliance. Without valid W-9s, you can’t file accurate 1099s, and you may face penalties. This guide covers how to collect, verify, and manage W-9 forms effectively.

What Is a W-9?

Form W-9 (Request for Taxpayer Identification Number and Certification) collects the information you need to: - Report payments to the IRS on 1099 forms - Verify the vendor’s tax classification - Confirm their taxpayer identification number (TIN)

What’s on a W-9

When to Collect W-9s

Best Practice: Before First Payment

Request W-9 as part of vendor onboarding, before processing any payment.

Benefits: - Never pay without knowing tax status - Avoids year-end scramble - Establishes professional process - Enables accurate 1099 filing

Required: Before Filing 1099

At minimum, you must have W-9 information before January 31 to file 1099s.

Update When:

• Vendor legal name changes
• Tax classification changes
• TIN changes
• Address changes
• Every 3 years (best practice)

W-9 Collection Process

Step 1: Include in Vendor Onboarding

Email Template:

Subject: Vendor Setup - W-9 Required

Dear [Vendor Contact],

Thank you for your interest in doing business with [Your Company].

Before we can process your first payment, we need a completed
W-9 form for our records. This is required for IRS 1099
reporting purposes.

Please complete and return the attached W-9 form to
[ap@yourcompany.com].

Required information:
• Legal business name (as it appears on your tax return)
• Federal tax classification
• Taxpayer Identification Number (EIN or SSN)
• Signature and date

We cannot process payments without this documentation.

If you have questions, please contact [contact info].

Thank you,
[Your Name]

Step 2: Follow Up on Missing W-9s

Follow-Up Schedule:

Second Reminder Template:

Subject: REMINDER: W-9 Required for Payment Processing

Dear [Vendor Contact],

We still need your completed W-9 form to process payments.

Current status: [X] invoices totaling [$amount] are on hold
pending receipt of your W-9.

Please return the completed form by [date] to avoid further
payment delays.

[Attachment: W-9 form]

Thank you,
[Your Name]

Step 3: Verify the W-9

Before accepting a W-9, verify:

Completeness Check: - [ ] Legal name filled in - [ ] Tax classification checked - [ ] TIN provided (complete 9 digits) - [ ] Form signed - [ ] Date within last 3 years

Validity Check: - [ ] TIN format correct (XX-XXXXXXX for EIN, XXX-XX-XXXX for SSN) - [ ] Name matches TIN (use IRS TIN matching) - [ ] Tax classification makes sense for vendor type - [ ] Signature is not just typed name (should be actual signature)

Step 4: Store Securely

W-9s contain sensitive information (TINs):

Storage Requirements: - Secure location (locked cabinet or encrypted storage) - Limited access (AP staff only) - Retention per your policy (7+ years recommended) - Easy retrieval for 1099 preparation

TIN Verification

IRS TIN Matching

The IRS offers a free TIN matching program to verify TIN/name combinations.

How to Use: 1. Register at IRS e-Services 2. Submit TIN/name combinations 3. Receive match/no-match results

When to Use: - New vendor setup - Year-end 1099 preparation - After receiving W-9 with potential issues

Common TIN Issues

Handling Problem Vendors

Vendor Won’t Provide W-9

Options: 1. Hold payments until W-9 received 2. Backup withholding (24%) if you must pay 3. Escalate to your contact’s manager 4. Terminate relationship if non-compliance continues

Communication:

Subject: Final Notice - W-9 Required

Dear [Vendor Contact],

Despite multiple requests, we have not received your W-9 form.

Effective [date], we will:
☐ Place all invoices on payment hold, AND/OR
☐ Apply 24% backup withholding to all payments

To avoid this, please submit your completed W-9 by [date].

This is required by IRS regulations, and we cannot make
exceptions.

[Your Name]

W-9 Has Errors

Don’t accept: - Missing signature - Missing TIN - Incomplete tax classification - White-out or corrections without initials

Request new W-9 rather than accepting flawed form.

Old W-9 (Over 3 Years)

While W-9s don’t expire, best practice is to refresh every 3 years: - Business information may have changed - Tax classification may have changed - Addresses need updating - Demonstrates active vendor management

Managing W-9s at Scale

Centralized Tracking

Create a tracking spreadsheet or use your AP system:

Automated Collection

Options: - Vendor portal with W-9 upload requirement - DocuSign or similar for electronic W-9 - AP automation tools with vendor onboarding - Dedicated W-9 collection services

Year-End Cleanup

October: - Run report of vendors without W-9 - Send requests to all non-compliant vendors

November: - Follow up on non-responses - Escalate persistent non-compliance

December: - Final push for missing W-9s - Decide on backup withholding for remaining vendors

January: - Complete 1099 preparation with available information - Note vendors for backup withholding going forward

W-9 vs. W-8 for Foreign Vendors

Note: Foreign vendors may not need 1099, but may need 1042-S for withholding reporting.

Key Takeaways

• Collect W-9 before first payment, not at year-end
• Verify TIN/name combination using IRS matching
• Store W-9s securely—they contain sensitive information
• Follow up persistently on missing W-9s
• Refresh W-9s every 3 years
• Use backup withholding (24%) if you must pay without W-9

Related Reading

• 1099 Vendor Requirements - Who needs a 1099 and how to file
• Vendor Onboarding Checklist - Complete onboarding process
• AP Internal Controls - Control framework for AP

Want to collect W-9s automatically when vendors submit their first invoice? See how BillerPlus streamlines vendor onboarding →