W-9 Business Name: Line 1, Line 3, and TIN Matching

The business name you put on a W-9 depends on who the IRS treats as the taxpayer. If you’re a sole proprietor or a single-member LLC that hasn’t elected corporate taxation, your personal legal name goes on Line 1 and the business or trade name goes on Line 2. If you operate as a corporation, partnership, or multi-member LLC, the entity’s registered legal name goes on Line 1 and any DBA goes on Line 2. Get this backwards and the IRS’s name-and-TIN matching will flag it, which can trigger 24% backup withholding on every payment you receive.¹

Line 1 Is for the Taxpayer, Line 2 Is for the Business

Line 1 is the only line the IRS truly cares about. It has to match, character for character, whatever name is already tied to the Taxpayer Identification Number you enter in Part I. The IRS uses that pairing to track income reported about you on 1099s, and any deviation reads as a mismatch.¹

What that means in practice depends on entity type:

Individuals and sole proprietors put their full legal name, as it appears on the Social Security card.
Corporations (C or S), partnerships, and multi-member LLCs put the entity’s legal name as shown on its tax return.²
Trusts and estates put the name of the trust or estate itself, not the trustee or personal representative.²
Single-member LLCs that are disregarded entities put the owner’s name, not the LLC’s name.

Line 2 is optional. It exists for the trade name, the DBA, or the brand people know you by. This is where a freelancer’s studio name lives. This is where a sole proprietor’s storefront name lives. This is where a disregarded-entity LLC’s own name lives. The payer uses Line 2 to match your W-9 to their invoices, their accounts-payable records, and the name on your bank account. But the 1099 they eventually file with the IRS uses the Line 1 name and the Part I TIN.³

The two lines answer different questions. Line 1 answers “who is the taxpayer.” Line 2 answers “what do you call your business.”

The Single-Member LLC Problem

The most common W-9 mistake happens here, and it happens because the correct answer feels wrong.

If you formed a single-member LLC and never filed an election to be taxed as a corporation, the IRS treats your LLC as a disregarded entity. It doesn’t exist as a separate taxpayer. All income and expenses flow through to you personally on Schedule C, and the W-9 has to reflect that.³

So for a disregarded-entity LLC owned by an individual:

Line 1 is the owner’s personal legal name.
Line 2 is the LLC’s name.
Line 3 is the box for the owner’s tax classification, typically “Individual/sole proprietor or single-member LLC.”
Part I is the owner’s SSN or personal EIN. Not the LLC’s own EIN.¹

Putting the LLC’s name on Line 1 and the LLC’s EIN in Part I is the single most common W-9 error for freelancers and small business owners. It feels right because the LLC name is on your contracts, your invoices, your bank account, and your business cards. The IRS just doesn’t recognize a disregarded entity as a separate taxpayer, so pairing the LLC’s name with the LLC’s EIN produces a mismatch every time.

The rule flips if the LLC has elected to be taxed as a C corporation, S corporation, or partnership, or if it’s owned by another entity rather than an individual. Then the LLC is no longer disregarded. The LLC’s legal name goes on Line 1, the LLC’s EIN goes in Part I, and on Line 3 you check the LLC box and write “C,” “S,” or “P” to show its classification.⁴

Line 3 Has to Agree With Line 1

The box you check on Line 3 tells the payer which name-and-TIN combination they should expect above it. The current W-9, revised March 2024, offers:²

Individual/sole proprietor or single-member LLC — for individuals, sole proprietors, and disregarded-entity LLCs owned by individuals; pairs with the owner’s name and SSN or personal EIN.
C Corporation or S Corporation — pairs with the corporate name and the corporation’s EIN.
Partnership — pairs with the partnership name and its EIN; also used by multi-member LLCs taxed as partnerships.
Trust/estate — pairs with the entity’s legal name and its EIN.
LLC — only for LLCs that have elected to be taxed as something other than a disregarded entity; check the box and write “C,” “S,” or “P.”¹

Not sure how your LLC is classified? Look at your last tax return. A disregarded entity’s income shows up on Schedule C of the owner’s personal return. An LLC taxed as a partnership files Form 1065. An LLC taxed as a corporation files Form 1120 or 1120-S.

What to Enter, by Entity Type

A condensed reference:

Sole proprietor with no LLC — Line 1: your legal name. Line 2: trade name or DBA if any. Line 3: Individual/sole proprietor. TIN: your SSN or personal EIN.
Single-member LLC, disregarded — Line 1: owner’s legal name. Line 2: LLC name. Line 3: owner’s classification box. TIN: owner’s SSN or personal EIN.³
Multi-member LLC taxed as partnership — Line 1: LLC name. Line 2: DBA if any. Line 3: LLC, “P.” TIN: LLC’s EIN.
LLC taxed as corporation — Line 1: LLC name. Line 2: DBA if any. Line 3: LLC, “C” or “S.” TIN: LLC’s EIN.¹
C or S corporation — Line 1: corporate name. Line 2: DBA if any. Line 3: C or S Corporation. TIN: corporation’s EIN.
Partnership — Line 1: partnership name. Line 2: DBA if any. Line 3: Partnership. TIN: partnership’s EIN.
Trust or estate — Line 1: name of the trust or estate. Line 2: usually blank. Line 3: Trust/estate. TIN: entity’s EIN.²

A shortcut when the classification isn’t obvious: look at whose tax return reports the income. That person or entity’s name goes on Line 1, their TIN goes in Part I, and everything else on the form follows from that.

What Happens if the Name and TIN Don’t Match

When a payer files a 1099 with a name-and-TIN pair the IRS can’t reconcile, the IRS sends the payer a CP2100 or CP2100A notice. The payer sends you a B-Notice asking for a corrected W-9.⁵

If you don’t respond, the payer must start backup withholding no later than 30 business days after receiving the CP2100.⁵ Backup withholding takes 24% off every reportable payment and sends it directly to the IRS.⁶ Once it starts, it continues until you submit a corrected W-9 with a matching name and TIN, and the payer must keep withholding for at least 30 calendar days after receiving the correction. You’ll eventually get credit for the withheld amounts on your return, but your cash flow absorbs the hit in the meantime.

Keeping Your W-9 Secure

A completed W-9 carries your legal name, address, and either your SSN or an EIN. The IRS warns against sending taxpayer identification numbers through standard email because email is not encrypted by default.⁷ If a client insists on email, password-protect the PDF and share the password separately by phone or text. Better, ask whether they accept W-9s through an encrypted portal; most contractor management platforms do.

You’re also not obligated to hand a W-9 to everyone who asks. The form is for payers who are legally required to file information returns about you, typically businesses paying $600 or more in a year. A request from someone you’ve never done business with is worth questioning before you send anything.

1
Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
2
Internal Revenue Service. Form W-9 (Rev. March 2024)
3
Internal Revenue Service. Instructions for the Requester of Form W-9
4
Internal Revenue Service. Instructions for the Requester of Form W-9 (03/2024)
5
Internal Revenue Service. Understanding Your CP2100 or CP2100A Notice
6
Office of the Law Revision Counsel. 26 USC 3406 – Backup Withholding
7
Internal Revenue Service. Sending and Receiving Emails Securely