Form W-9 for a C corporation

Most payments to a corporation are outside 1099 reporting, yet corporations are asked for W-9s constantly. The payer needs the form to document why it filed nothing.

By The W9Form.org Editorial Team Updated August 18, 2026 Reviewed against Form W-9 (Rev. March 2024)

Name, box, number, and what gets reported

Line 1: The registered corporate name
Line 2: Trade name or DBA, if any
Line 3a: C corporation, or LLC + C for an LLC that elected
Line 4: Exempt payee code 5 where the requester asks and the payment qualifies
Part I: The corporation’s EIN
Tax return: Form 1120

A C corporation is a corporation taxed under subchapter C: it pays tax on its own income and files Form 1120. For W-9 purposes the rate matters far less than the corporate payee exception, which keeps most payments to corporations off Forms 1099-NEC and 1099-MISC. The exception is broad, and it is the reason a corporation can invoice the same client for a decade without a single 1099 arriving in January. It is also the reason corporate accounting departments assume the W-9 has nothing to do with them, and that assumption is where the trouble starts, because the payer who cannot document why it skipped a 1099 is the one carrying the exposure. Documentation, here, means a signed form with a number on it.

Three reasons the request still comes

The payer needs a certified TIN to document that the exception applies. Several payment categories are reportable to corporations anyway, legal fees and medical payments being the two you will meet most often. And backup withholding attaches to a missing certification rather than to your entity type, so a payer with no W-9 on file may have to withhold 24% from a corporation as readily as from a freelancer.

What to put on each line

Form W-9 entries for a C corporation

Line 1

The corporate name exactly as registered, e.g., Halloway Instruments, Inc.

Line 2

A trade name, if the corporation invoices under one

Line 3a

C corporation. An LLC that filed Form 8832 checks LLC and writes C.

Line 3b

Blank

Line 4

Exempt payee code 5 if requested. FATCA D if publicly traded, E if in the same expanded affiliated group as such a corporation. Otherwise blank.

Lines 5–6

The corporation’s address

Line 7

Optional

Part I

The corporation’s EIN

Part II

Signed by an officer with authority

Payments still reportable to a corporation

The exception is narrower than its reputation. Several categories are reportable to a corporation regardless of its status, and two of them, legal fees and medical payments, are common enough that a great many corporations meet one or the other every year. Read the table below as a map of where the exception stops.

The corporate payee exception and its limits
Payment	Reportable?	Form and box
Ordinary goods and services	No	—
Legal services and gross proceeds to an attorney	Yes	1099-NEC box 1a, or 1099-MISC box 10
Medical and health care payments	Yes	1099-MISC box 6
Payments by a federal executive agency	Yes	1099-MISC or 1099-NEC
Substitute payments in lieu of dividends or interest	Yes	1099-MISC box 8
Cash paid for fish for resale	Yes	1099-MISC box 11
Interest, dividends, broker proceeds	Yes	1099-INT, 1099-DIV, 1099-B
Card and third-party network payments	Yes	1099-K

The exception is the payer’s decision to make

You supply an accurate W-9; the payer decides what is reportable. If it files a 1099-NEC on a payment you believe was exempt, no harm comes to you as long as the amount is right, since you report your revenue from your own books either way. Arguing the point with a client’s accounts payable clerk buys nothing. Which box a payer should have used is set out at the two forms box by box.

C corporation or S corporation?

Both are corporations under state law, formed the same way, with the same articles and the same registered agent. What separates them is a federal election. If Form 2553 was filed and the IRS acknowledged it, you are an S corporation for tax purposes and you check that box on Line 3a instead. Nothing on the W-9 asks for the election date or the notice number, so the check box is the only place the distinction surfaces, and a wrong box here sends your 1099s into a matching program pointed at the wrong return type. Corporations that elected S status years ago and never updated their vendor paperwork are the usual offenders.

Telling them apart
	C corporation	S corporation
Federal return	Form 1120	Form 1120-S
Election	None needed. C is the default for a corporation	Form 2553, acknowledged by CP261
Taxation	Entity pays tax; dividends taxed again to shareholders	Pass-through to shareholders on Schedule K-1
Line 3a box	C corporation	S corporation
Shareholder limits	None	Up to 100, U.S. individuals and certain trusts only

S corporation guidance

Mistakes to avoid

Putting an officer’s SSN in Part I when the corporation has an EIN of its own.
Checking C corporation after Form 2553 was filed and accepted. You are an S corporation.
Checking the C corporation box as an LLC instead of the LLC box with C.
Refusing to send a W-9 on the grounds that you are exempt. Exemption from reporting is not exemption from certifying.
Entering FATCA code D without being publicly traded.

What gets reported about you

Most payments to your corporation never appear on a 1099, so the revenue figure on Form 1120 has to come out of your own accounting records. Nobody mails you a summary. That is a convenience right up until it becomes a problem, because a corporation that waits for January envelopes to reconstruct its year will understate income, and the understatement is nobody’s fault but its own. The remedy is unglamorous and entirely within your control: invoice register, deposits, and a reconciliation that ties the two together every month. Keep the books. The corporation then pays tax at the entity level on its taxable income, and what it distributes to shareholders afterward is a dividend, reported separately on Form 1099-DIV under a different set of rules that have nothing to do with the W-9 you signed for a customer.

Frequently asked questions

Can we refuse to provide a W-9 because we are a corporation?

You can, and the payer will then be required to treat you as an uncertified payee and may have to withhold 24%, which is an expensive way to make a point. What refusal actually triggers

Which exempt payee code applies to a corporation?

Code 5, which signals exemption from backup withholding on the payment types the corporate exception covers. It does nothing for legal or medical payments, or for money paid to you by a federal agency. All codes, and the federal-agency hole in the exception.

Do we need a W-9 for a wholly owned subsidiary?

Each entity with its own EIN completes its own W-9 in its own name. A disregarded subsidiary reports its owner. Detail

Download Form W-9 Full line-by-line instructions Check your entries

General information, not tax advice. This page explains a federal tax form in plain English. It is not legal, tax, or accounting advice, and W9Form.org is not affiliated with the IRS. Verify everything against the official Form W-9 page on IRS.gov and speak to a licensed professional about your own situation. How we source and review these pages.