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DefinitionA single-member LLC is a Limited Liability Company owned by exactly one person or entity. By default, the IRS treats it as a "disregarded entity," meaning the LLC itself does not f
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Plain English Guide
Single Member Llc · File.Business

Single-Member LLC The most common new business structure.

A single-member LLC is a Limited Liability Company owned by exactly one person or entity. By default, the IRS treats it as a "disregarded entity," meaning the LLC itself does not file a federal tax return; the owner reports business activity on their personal return. It is the most common structure for solo founders, freelancers, real estate investors with a single property, and side businesses.

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Formal Definition

A single-member LLC (often abbreviated SMLLC) is a Limited Liability Company with one owner. By default, it is treated as a "disregarded entity" for federal tax purposes, but it is still a separate legal entity from the owner for liability and state-law purposes.

In plain English

Here is what that actually means.

The "disregarded entity" classification is sometimes confusing. It means the IRS ignores the LLC for federal income tax purposes; the owner reports business profits and losses on Schedule C of their personal Form 1040, just like a sole proprietor would. But the LLC is not the same as a sole proprietorship for liability purposes. The state-law separation between the owner and the LLC remains.

For most solo founders, a single-member LLC is the right structure. It provides liability protection, costs almost nothing to maintain, and does not require a separate federal tax return. Compared to a sole proprietorship, you get the liability shield. Compared to a multi-member LLC or corporation, you avoid the additional tax filings.

Single-member LLCs can elect S-Corp tax treatment by filing Form 2553 with the IRS, typically once net profit (after expenses, before owner pay) crosses $60,000 to $80,000. The election lets the owner pay themselves a reasonable salary through payroll, then take the remainder as distributions exempt from self-employment tax. The election is reversible (but with a 5-year waiting period before re-electing).

Key facts

The four things to know.

One owner
Owner can be an individual, an LLC, a Corporation, or a trust
Disregarded by default
No federal tax return; owner reports on Schedule C
Full liability shield
Same protection as multi-member LLCs in every state
S-Corp electable
Form 2553 election available when profit justifies it
Who needs this

Common situations.

Solo founders Most common reason to form a single-member LLC.
Freelancers Consultants, designers, developers, writers operating under a brand.
Real estate investors (one property) One property in one LLC for liability isolation.
Side businesses Anyone running a side business with some revenue and liability exposure.
International founders Non-US persons forming a US single-member LLC for US banking and operations.
How it compares

Related concepts side by side.

Single-Member LLC vs Sole Proprietorship
Sole prop has no liability shield; the owner is personally liable for business debts. SMLLC adds the shield without significantly changing taxes (still pass-through to Schedule C).
Single-Member LLC vs Multi-Member LLC
SMLLC has one owner and no partnership return. Multi-member LLC has 2+ owners and files Form 1065. Operating Agreement is more complex.
Single-Member LLC vs Corporation
Corporation has shareholders, board, bylaws, double taxation. SMLLC is simpler and pass-through.
Single-Member LLC vs S-Corp Election
SMLLC + S-Corp election (Form 2553) is a common structure for profitable solo operators. The LLC is still the legal entity; only the tax treatment changes.
FAQ

Common questions.

Is a single-member LLC pass-through for tax purposes?
Yes, by default. The IRS treats SMLLCs as disregarded entities, meaning the owner reports business activity on Schedule C of their personal Form 1040. The LLC itself files no federal income tax return.
Do I need an EIN for a single-member LLC?
Technically you can use your SSN, but every business bank, payment processor, and customer (for W-9 purposes) will ask for an EIN. We obtain an EIN free with every formation.
Can a single-member LLC have employees?
Yes. The LLC can have W-2 employees. The owner is not an "employee" of their own SMLLC by default (unless S-Corp election is made and the owner pays themselves through payroll).
Should a single-member LLC elect S-Corp tax treatment?
Generally when net profit crosses $60,000 to $80,000 annually. Below that, payroll complexity is not worth the self-employment tax savings. Above, the math typically saves $5,000+ per year.
Does a single-member LLC need an Operating Agreement?
Most states do not require one for SMLLCs, but every business bank, lender, and investor will ask for one. It also helps maintain the liability shield in court.
Can I be sued personally if I operate as a single-member LLC?
Generally no, as long as you maintain the liability shield (separate bank account, no commingling, follow the Operating Agreement, file annual reports). The shield can be "pierced" in cases of fraud or veil-piercing factors.
Can I add a member later?
Yes. Adding a member converts the SMLLC into a multi-member LLC for tax purposes. The Operating Agreement is amended, and the LLC begins filing Form 1065. A new partnership tax year begins.
How does a single-member LLC differ from a sole proprietorship?
Both file Schedule C for tax purposes. The SMLLC adds liability protection and a separate legal entity. Sole prop offers no liability shield.
Can a non-US person form a single-member LLC?
Yes. Non-US persons can form and own a US single-member LLC. The LLC obtains an EIN via paper Form SS-4 and may file Form 5472 + 1120 if there are reportable transactions with foreign owners.

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