W-9 for LLCs: Which Tax Classification Should You Choose?

If you have an LLC, the W-9’s tax classification question can feel tricky. The form has several LLC options, and choosing the wrong one can cause headaches down the line. Here’s how to pick the right one.

Why LLCs are complicated on a W-9

An LLC is a legal entity, but the IRS doesn’t have a specific tax category called “LLC.” Instead, LLCs are taxed as one of several other types of business, depending on their structure and any elections they’ve made:

• A single-member LLC is taxed like a sole proprietorship by default.
• A multi-member LLC is taxed like a partnership by default.
• Any LLC can elect to be taxed as an S corporation or C corporation.

Because of this, what you check on Line 3 of your W-9 depends on how your LLC is actually taxed, not just the fact that it’s an LLC.

If you have a single-member LLC (and haven’t made an election)

If you’re a one-person LLC and you haven’t filed anything with the IRS to change your tax treatment, you’re a “disregarded entity.” That means:

• For federal tax purposes, you’re treated exactly like a sole proprietor.
• Your LLC’s income flows directly onto your personal tax return (Schedule C).

What to check on your W-9: Check “Limited liability company” and write “S,” “C,” or “P” in the blank. (That designation is for S corp, C corp, or partnership elections.) For a single-member LLC with no election, the IRS instruction is to check “Individual/sole proprietor” on Line 3, because that’s how you’re actually taxed.

Alternatively, you can check “Limited liability company” and leave the classification box blank or write “Disregarded entity”. Most tax professionals recommend simply checking “Individual/sole proprietor” to avoid confusion.

Your name on Line 1: Enter your own personal name, not your LLC’s name. Your LLC name can go on Line 2 if it’s different from your personal name.

Your TIN: Use your personal SSN unless you have a separate EIN for the LLC, in which case you can use either, as long as the name on Line 1 matches.

If you have a single-member LLC taxed as an S corporation

If you filed Form 2553 and the IRS approved your S corp election:

• Check: “Limited liability company”
• Write: “S” in the adjacent box
• Line 1: Your LLC’s legal name (not your personal name)
• TIN: Your LLC’s EIN

If you have a single-member LLC taxed as a C corporation

If you filed Form 8832 and elected C corporation treatment:

• Check: “Limited liability company”
• Write: “C” in the adjacent box
• Line 1: Your LLC’s legal name
• TIN: Your LLC’s EIN

If you have a multi-member LLC

Multi-member LLCs are taxed as partnerships by default. Unless you’ve made an S corp or C corp election:

• Check: “Limited liability company”
• Write: “P” in the adjacent box (for partnership)
• Line 1: Your LLC’s legal name
• TIN: Your LLC’s EIN

Quick reference table

LLC situation	Check on Line 3	Write in box	TIN to use
Single-member, no election	Individual/sole proprietor	—	SSN or EIN
Single-member, S corp election	Limited liability company	S	LLC’s EIN
Single-member, C corp election	Limited liability company	C	LLC’s EIN
Multi-member, no election	Limited liability company	P	LLC’s EIN
Multi-member, S corp election	Limited liability company	S	LLC’s EIN

Why this matters

If you provide the wrong classification, it usually doesn’t cause immediate problems, but it can lead to confusion if the payer applies backup withholding rules incorrectly, or if your 1099 doesn’t match your tax return. Getting it right from the start is cleaner.

Still not sure?

If you’re unsure how your LLC is classified for tax purposes, the quickest way to find out is to look at how you’ve been filing taxes:

• If you file a Schedule C with your personal return: you’re likely a disregarded entity (check “Individual/sole proprietor”).
• If you file Form 1065: you’re a partnership (check “LLC” and write “P”).
• If you file Form 1120-S: you’re an S corp (check “LLC” and write “S”).
• If you file Form 1120: you’re a C corp (check “LLC” and write “C”).

A quick consultation with a tax professional can confirm this if you’re still unsure.

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