Whether your LLC has one owner or several changes how the IRS taxes it and how much documentation you need. Here's the practical difference.
Single-member LLC
Owned by one person. By default the IRS treats it as a "disregarded entity" — taxed on your personal return. Simple, but note foreign-owned single-member LLCs have special filing duties (see Form 5472).
Multi-member LLC
Owned by two or more. Taxed by default as a partnership, filing its own information return and issuing K-1s to members. More paperwork, more need for a solid operating agreement.
Which to choose
It usually follows your ownership reality rather than a strategic choice — but understand the tax treatment each triggers before you file.
Frequently asked questions
Is a single-member LLC taxed differently?
Yes — by default it's a disregarded entity taxed on your personal return, while a multi-member LLC is taxed as a partnership.
Can a single-member LLC add members later?
Yes, but adding a member changes its default tax treatment to a partnership, so plan for it.
Do foreign-owned single-member LLCs have extra rules?
Yes — they generally must file Form 5472, with a steep penalty for missing it.