Educational Resource — June 2026 This guide explains how to fill out a W-9 for common LLC types. It is not legal or tax advice. When in doubt, consult a CPA.

What Is the W-9 Tax Classification?

When you receive a payment as a business, the payer often asks you to fill out IRS Form W-9 so they can issue you a 1099 at year-end. Line 3 of the W-9 asks for your "Federal tax classification."

This question exists because different entity types are reported differently to the IRS. A corporation (S-Corp or C-Corp) is generally not required to receive a 1099-NEC for business services payments — but a sole proprietor or partnership is. By declaring your classification on the W-9, you tell the payer how to handle your 1099 reporting.

Line 3 Options Explained

The W-9 (Rev. March 2024, current for 2026) offers these checkboxes on Line 3:

  • Individual/sole proprietor or single-member LLC
  • C Corporation
  • S Corporation
  • Partnership
  • Trust/estate
  • LLC — with a separate field to enter your LLC's tax classification letter (C, S, or P)
  • Other

For most LLCs, the choice comes down to four of these options. Here is how to choose the right one.

Single-Member LLC (Disregarded Entity)

If you have a single-member LLC that has not elected to be taxed as an S-Corp or C-Corp, the IRS treats it as a disregarded entity. For W-9 purposes:

  • Check: "Individual/sole proprietor or single-member LLC"
  • Line 1 (Name): Your full personal name (as it appears on your tax return)
  • Line 2 (Business name): Your LLC name (if different from Line 1)
  • TIN (Line 4 or equivalent): You can use your SSN or your LLC's EIN
Why 'Individual' and Not 'LLC'?

This surprises many people. A single-member disregarded LLC is essentially ignored by the IRS — you're taxed as an individual. So you check "Individual/sole proprietor or single-member LLC," not the "LLC" box. The "LLC" box on Line 3 is for LLCs that have made a tax election (S-Corp, C-Corp, or multi-member partnership).

Multi-Member LLC (Partnership)

If your LLC has two or more members and has not elected S-Corp or C-Corp status, it is taxed as a partnership by default.

  • Check: "LLC" box and enter "P" in the tax classification field
  • Line 1 (Name): The LLC's legal name
  • TIN: The LLC's EIN (not a member's SSN)

LLC Taxed as an S-Corporation

If your LLC has filed Form 2553 and received IRS approval of S-Corp status:

  • Check: "LLC" box and enter "S" in the tax classification field
  • Line 1 (Name): The LLC's legal name
  • TIN: The LLC's EIN
Backup Withholding Exemption

S-Corps are generally exempt from backup withholding. If your LLC is an S-Corp, you can enter "1" in the "Exempt payee code" box on the W-9 to claim this exemption.

LLC Taxed as a C-Corporation

If your LLC has filed Form 8832 and elected C-Corp tax treatment:

  • Check: "LLC" box and enter "C" in the tax classification field
  • Line 1 (Name): The LLC's legal name
  • TIN: The LLC's EIN
  • Backup withholding exemption code: C-Corps are generally exempt from backup withholding; enter "1" in the exempt payee code box

Common W-9 Mistakes for LLCs

  • Checking "LLC" for a disregarded entity SMLLC: If you're a solo LLC owner without an S-Corp or C-Corp election, you should check "Individual/sole proprietor or single-member LLC," not "LLC."
  • Using an SSN for a partnership or S-Corp: Multi-member LLCs and LLCs with an S-Corp or C-Corp election must use the LLC's EIN, not a member's SSN.
  • Leaving the classification letter blank: If you check the "LLC" box, you must also fill in the tax classification letter (C, S, or P). Leaving it blank makes the W-9 incomplete.
  • Not updating after an S-Corp election: If you recently made an S-Corp election, update your W-9 with any payers. The classification box should now say "LLC" with "S" — not "Individual."
  • Confusing "LLC" (legal entity) with W-9 classification: The W-9 asks about your tax classification, not your legal structure. An LLC is a legal entity type, not a tax classification in itself.

Official Sources

Frequently Asked Questions

LLC W-9 Tax Classification FAQs

On Line 3 of the W-9, check the "LLC" box. Then in the small "Tax classification" field next to it, enter the letter that matches your LLC's election: "S" for S-Corp, "C" for C-Corp, or "P" for partnership (multi-member LLC treated as partnership). If you have a single-member LLC that is a disregarded entity (the default), you check "Individual/sole proprietor or single-member LLC" instead of the LLC box.
A single-member LLC that has not elected S-Corp or C-Corp status should check "Individual/sole proprietor or single-member LLC" on Line 3. The IRS treats this LLC as a disregarded entity, so you fill out the W-9 using your own personal name on Line 1 and your LLC name (if different) on Line 2.
A "disregarded entity" is a single-member LLC that the IRS ignores as a separate entity for tax purposes. Your LLC's income is taxed as your personal income. On a W-9, this means you use your own SSN (or EIN if the LLC has its own EIN) and check "Individual/sole proprietor or single-member LLC."
Yes. If your LLC has an approved S-Corp election (via Form 2553), you check the "LLC" box on Line 3 and enter "S" in the tax classification field. You also typically use your LLC's EIN on Line 4 (or whichever line asks for your TIN). You should not check "Individual" if you have elected S-Corp status.
For a single-member LLC (disregarded entity), you can use either your SSN or your LLC's EIN. However, the IRS generally recommends using the EIN if the LLC has one, as it avoids mixing personal and business tax IDs. For a multi-member LLC or an LLC with an S-Corp or C-Corp election, always use the LLC's EIN.

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