Does a W-9 Need to Be Signed? When It’s Required and Who Signs

A W-9 does not always need to be signed. For the most common request — an independent contractor giving a client a taxpayer identification number so the client can issue a 1099-NEC — the IRS does not require your signature on Form W-9 unless the agency has previously told you that you gave an incorrect TIN. A signature is required, though, for interest and dividend accounts opened after 1983 and for real estate transactions. Many businesses still ask for a signed form as a matter of policy, so it helps to know when the signature is legally required and when it is not.

Payments That Require a Signed Certification

The IRS requires you to sign Part II of Form W-9 when the payment falls into one of these categories:

Interest, dividend, and barter exchange accounts opened after 1983, including bank and brokerage accounts.
Real estate transactions reported on Form 1099-S.
Any payment where the IRS has previously notified you that the TIN you gave was incorrect.

For these payment types, your signature is what lets the payer avoid mandatory backup withholding on your account. A valid signed form must contain your name, your taxpayer identification number, and a dated signature under penalties of perjury by you or someone authorized to sign on your behalf.¹

Payments That Do Not Require a Signature

For most business-to-business payments, you must provide a correct TIN but do not have to sign the certification, unless the IRS has already flagged your TIN as incorrect. The Form W-9 instructions place these in an “other payments” bucket that includes:²

Nonemployee compensation reported on Form 1099-NEC (independent contractor and freelance work).
Rents and royalties reported on Form 1099-MISC.
Medical and health care payments, including payments to corporations.
Attorney fees and gross proceeds paid to lawyers, including to law corporations.
Payment card and third-party network settlements reported on Form 1099-K.

A second no-signature group covers situations where the payer is reporting information about you rather than paying you for services: mortgage interest you paid, cancellation of debt, IRA and HSA contributions and distributions, qualified tuition program payments, and the acquisition or abandonment of secured property. None of these require a signed W-9.²

Interest, dividend, and barter exchange accounts opened before 1984, and broker accounts active during 1983, also fall outside the signature requirement.

Why the Requester May Still Want Your Signature

Even when the IRS does not require it, many businesses insist on a signed form as internal policy. A signed certification gives them a cleaner audit record. If you refuse to sign a form the payer’s policy treats as mandatory, the payer may pause your payments until you do, even though the IRS would accept an unsigned form for that payment type. Signing when asked usually costs you nothing and clears the payment.

What Your Signature Certifies

Signing Part II is not a formality. Under penalties of perjury, you certify four things:²

The TIN you entered — a Social Security number, EIN, or ITIN — belongs to you or your entity.
You are not currently subject to backup withholding for failing to report interest or dividends. If you are, you must cross out this item before signing.
You are a U.S. person, meaning a U.S. citizen, resident alien, or a domestic entity such as a U.S. corporation or partnership.
Any FATCA exemption code you entered is correct. This mainly matters for accounts held outside the United States.

Because the form is a sworn statement, sign only after checking that everything above the signature line is accurate.

Who Is Allowed to Sign

Who signs the form depends on who the payee is.

If you are an individual or sole proprietor, you sign your own form. Your name goes on line 1, and your SSN or EIN goes in Part I.

For a corporation, partnership, or multi-member LLC, the entity’s name goes on line 1 and its EIN in Part I, and a U.S. person authorized to act for the entity signs Part II.²

A single-member LLC treated as a disregarded entity is different: the owner’s name goes on line 1, the LLC’s name goes on line 2, and the owner signs using the owner’s TIN. If the owner is a foreign person, the correct form is a Form W-8, not a W-9.²

For a joint account, only the person whose TIN appears in Part I signs, and that person is listed first on line 1.²

An SEC-registered investment adviser or an SEC- and FINRA-regulated introducing broker can sign and transmit a W-9 for a client. Outside of brokers handling readily tradable instruments, the adviser or broker has to give the payer written proof of the payee’s authorization.³

What Happens If You Do Not Sign When Required

Two separate consequences can follow.

First, backup withholding kicks in. When a payer needs a signed certification and does not get one, the payer must withhold 24% from every reportable payment and send it to the IRS.⁴ The money is not gone. Your year-end 1099 will show the amount withheld, and you claim it as federal income tax withheld on your Form 1040, recovering it as a refund if you overpaid.⁵

Second, failing to provide a correct TIN when required can trigger a $50 penalty per failure, capped at $100,000 per calendar year. The IRS may waive it if you can show reasonable cause.⁶

Handwritten and Electronic Signatures

An ink signature on a paper form is always fine, and most requesters accept a scanned or photographed image of a signed form as a PDF or JPEG.

The IRS also allows electronic signatures, but the system collecting the form has to meet specific standards. It must make it reasonably certain that the person submitting the form is the person named on it, the final step must be an electronic signature under penalties of perjury, and the perjury language must match the paper form’s language.¹ Typing your name into a plain text field does not, by itself, satisfy those requirements. A compliant system usually adds a timestamp, an authentication step, and a tamper-resistant record of the submission.

When to Send a New W-9

p>A W-9 does not expire. It stays valid as long as the information on it is still accurate. Send a new one when something changes:

A legal name change from marriage, divorce, or court order.
A new Social Security number or EIN.
A change in how your LLC is classified for tax purposes, such as moving from a disregarded entity to a partnership or corporation.
The IRS tells the payer your TIN does not match its records.
Your backup withholding status changes.

An existing W-9 becomes invalid on the date the payer knows, or has reason to know, that the information on it is no longer correct.¹ When in doubt, submitting a fresh form is the quickest way to keep payments moving and avoid unexpected withholding.

1
Internal Revenue Service. Instructions for the Requester of Form W-9
2
Internal Revenue Service. Form W-9 (Rev. March 2024)
3
Internal Revenue Service. Instructions for the Requester of Form W-9 (Rev. January 2026)
4
Office of the Law Revision Counsel. 26 USC 3406 – Backup Withholding
5
Internal Revenue Service. Topic No. 307, Backup Withholding
6
Office of the Law Revision Counsel. 26 USC 6723 – Failure to Comply With Other Information Reporting Requirements