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Single-member vs multi-member LLC — what's the difference?
Single-member LLCs are taxed as sole proprietorships by default. Multi-member LLCs are taxed as partnerships. Both have liability protection — the difference is mostly tax treatment and complexity.
3 minUpdated Apr 27, 2026
An LLC's structure is determined by how many members (owners) it has. The choice affects taxes, paperwork, and how decisions get made — but liability protection is identical.
Single-member LLC (SMLLC)
- One owner
- Default IRS tax treatment: disregarded entity (taxed as a sole proprietorship — Schedule C on personal 1040)
- Simpler accounting, no separate partnership return
- Operating agreement still recommended (banks ask for it)
- Can elect S-Corp tax treatment at any time once profits justify it (~$60k+ net)
Multi-member LLC (MMLLC)
- Two or more owners
- Default IRS tax treatment: partnership (Form 1065 + K-1s issued to each member)
- Operating agreement is mandatory in practice — defines profit splits, voting, etc.
- More paperwork, but partnership tax structure has flexibility around distributions
- Can elect S-Corp or C-Corp at any time
Which to pick? If it's just you, go single-member. If you have a partner from day one, go multi-member. Adding a member later is a state filing + IRS change — see 'How to add a co-founder.'
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