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Single-Member LLC: Taxes, Rules and How to Form One
Most founders who form a US LLC on their own end up with a single-member LLC. Here is what that means, how a single-member LLC is taxed, how it compares with a multi-member LLC, and what an owner outside the US needs to file each year.
A single-member LLC is an LLC with one owner. It gives you the same liability protection as any LLC. For US federal tax it is a disregarded entity by default, so its profit is reported by the owner rather than taxed at company level. If you live outside the US, your one-owner LLC must file Form 5472 with a pro forma Form 1120 every year, even with no income; missing it can cost $25,000.
What Is a Single-Member LLC?
A single-member LLC (SMLLC) is a limited liability company owned by one person or one company, also called a sole-owner LLC. The owner can live anywhere in the world. Legally, the LLC is separate from you: it holds its own bank account, signs its own contracts and carries its own debts.
Single-Member LLC vs Multi-Member LLC
| Point | Single-member LLC | Multi-member LLC |
|---|---|---|
| Owners | One | Two or more |
| Default federal tax | Disregarded entity | Partnership |
| Yearly IRS filing (owners abroad) | Form 5472 + pro forma Form 1120 | Form 1065 partnership return, with partner forms |
| Decision-making | You decide alone | Set by the operating agreement |
| Setup | Simplest | Needs clear ownership split |
| Best for | Solo founders, freelancers, online sellers | Partners and co-founders |
Starting with partners? A multi-member LLC lets each partner hold a share. Write the split, voting and exit rules into an operating agreement from the start.
How a Single-Member LLC Is Taxed
By default, the IRS ignores a one-owner LLC as a separate taxpayer. For a US owner, the profit goes on the owner’s personal return, much like a sole proprietorship. The LLC can also elect to be taxed as a C corporation if that suits the business better.
Single-Member LLC Taxes for Owners Outside the US
A foreign-owned one-owner LLC has a special filing rule. It must file Form 5472 attached to a pro forma Form 1120 every year to report transactions between the LLC and its owner. This applies even if the LLC had no income.
- Form 5472: reports money moving between you and the LLC
- Pro forma Form 1120: a cover return the 5472 is attached to
- Penalty: $25,000 for each form that is missing or late
- US income tax: depends on whether the income is connected with a US trade or business; many service and online businesses run from abroad owe none, but our tax team checks your case
LLCPronto files Form 5472 and Form 1120 together for up to $60.
Benefits of Owning Your LLC Alone
- Personal asset protection with one owner in full control
- Simple tax treatment by default
- A US EIN, bank account and payment platforms in the LLC’s name
- Easy to add a partner later and become a multi-member LLC
- Low running costs in states such as New Mexico and Wyoming
What You Must Do Each Year
- Keep the registered agent active in the LLC’s state
- File the state annual report or pay the state fee, if your state has one; see LLC annual report by state
- File Form 5472 and Form 1120 (owners abroad)
- Keep business and personal money separate
- Keep records of money you put into or take out of the LLC
Which Tax Form to Give Platforms
Because a one-owner LLC is disregarded for US tax, platforms such as Amazon, Stripe and Upwork usually ask for a form in the owner’s name. For an owner outside the US, that is commonly Form W-8BEN. Answer the same way on every platform so your records match.
How to Form a Single-Member LLC
- Pick your state; see the best state for an LLC
- Choose a name; see our LLC name search guide
- Order your LLC: we file the Articles of Organization and act as registered agent
- Get your EIN within 24 hours, without an SSN
- Open a business bank account and connect your payment platforms
Single-Member LLC: FAQs
What is a single-member LLC?
An LLC with one owner. It has full liability protection and is taxed as a disregarded entity by default.
Can a foreigner own a single-member LLC?
Yes. There is no citizenship or residency requirement. You need a passport, and LLCPronto provides the registered agent, US address and EIN.
Does a single-member LLC pay taxes?
The LLC itself does not pay federal income tax by default; the owner reports the profit. Owners abroad must still file Form 5472 with a pro forma Form 1120 every year.
What is the difference between a single-member and multi-member LLC?
The number of owners and the default tax treatment: a single-member LLC is disregarded, while a multi-member LLC is taxed as a partnership.
Can I add a partner to my single-member LLC later?
Yes. Adding a member turns it into a multi-member LLC, which changes how it is taxed, so plan the tax filings before you do it.
Does a single-member LLC need an EIN?
Yes, in practice. Banks, Stripe, Amazon and the IRS filings all need it. We get it within 24 hours.
Does a single-member LLC need an operating agreement?
It is not always required, but it is strongly recommended to prove ownership to banks and platforms.
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