Is an electronic signature valid on a W-9?

Yes, when captured through a compliant e-signature process that identifies the signer and timestamps the certification. Many W-9 collection platforms provide IRS-acceptable e-signatures. Typed names without a signature platform may not meet your policy or audit standards.

Can someone else sign the W-9 for the vendor?

The form should be signed by an authorized person — the individual named, a corporate officer, or a partner with authority to bind the entity. If a third party signed, request confirmation of signing authority for high-dollar vendors.

What if the date is missing but the signature is present?

Reject the form and request correction. The date establishes when the certification was made. Undated forms fail most AP validation checklists and audit reviews.

Does a very old signature date make the W-9 invalid?

IRS rules do not expire W-9s by age alone, but many organizations require refresh when the form exceeds one to three years or when entity details change. An old date is a signal to re-collect — not an automatic rejection under IRS rules.

Guide

How to Validate W-9 Signature and Date

By Keelstar Team · Updated July 11, 2026

The short answer

A Form W-9 is not valid without a signature and date in Part II — the certification under penalties of perjury. Validate that the signature is present, appears intentional (not a typed placeholder), and is dated. Accept wet signatures, electronic signatures where your policy permits, and digital signatures from approved e-signature platforms. Reject unsigned forms, forms with blank date fields, and forms where the signature date predates the current IRS form revision by many years without a refresh. Signature validation is a binary gate — no signature means no payment release in controlled environments.

Why signature and date matter

Part II of Form W-9 is a certification under penalties of perjury. The payee attests that the TIN is correct, they are not subject to backup withholding (unless indicated), they are a U.S. person, and FATCA codes are correct if provided. Without a signature and date, there is no valid certification — you have a data collection sheet, not a compliant W-9.

What to check on receipt

Confirm Part II contains a signature — handwritten, electronic, or digital depending on submission method. Confirm the date field is completed with a plausible date (not a placeholder like '00/00/0000'). Verify the signature name is consistent with the person or entity on line 1. Flag forms signed before major entity changes that post-date the signature.

Signature present in Part II
Date field completed
Signature method meets company policy
Signer appears authorized for the entity type

Electronic and digital signatures

W-9 collection platforms typically capture e-signatures with audit trails showing signer identity, IP address, and timestamp. These meet most organizational standards. PDFs returned via email with a typed '/s/ Name' may or may not satisfy your policy — define acceptable methods in your tax documentation procedure.

Common signature failures

Unsigned forms submitted through vendor portals where the vendor skipped the final step. Scanned forms with signature lines blank. Forms where someone typed the name in the signature field without an e-signature platform. Auto-reject these at intake with a specific message: 'Part II requires your signature and today's date.'

Signature validation in your workflow

Make signature and date checks automated in your W-9 intake pipeline — not a manual eyeball test at year-end. Set vendor status to 'incomplete' when signature or date is missing. Block payment until status moves to 'validated.' Report incomplete rate monthly to catch portal or process issues.

Retain signature evidence for audits

Store the signed W-9 — or e-signature audit log — with the received timestamp. Auditors ask whether you had a valid certification on the date of payment. A workflow that captures and preserves signature metadata is stronger evidence than a shared drive of unsigned PDFs renamed at filing time.

Frequently asked questions

Is an electronic signature valid on a W-9?: Yes, when captured through a compliant e-signature process that identifies the signer and timestamps the certification. Many W-9 collection platforms provide IRS-acceptable e-signatures. Typed names without a signature platform may not meet your policy or audit standards.
Can someone else sign the W-9 for the vendor?: The form should be signed by an authorized person — the individual named, a corporate officer, or a partner with authority to bind the entity. If a third party signed, request confirmation of signing authority for high-dollar vendors.
What if the date is missing but the signature is present?: Reject the form and request correction. The date establishes when the certification was made. Undated forms fail most AP validation checklists and audit reviews.
Does a very old signature date make the W-9 invalid?: IRS rules do not expire W-9s by age alone, but many organizations require refresh when the form exceeds one to three years or when entity details change. An old date is a signal to re-collect — not an automatic rejection under IRS rules.

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