Imagine you run two separate rental properties, and each one gets sued by a tenant. In a regular LLC, both lawsuits hit the same pool of company assets. Creditors from one property can chase the money from the other.
A series LLC changes that. It lets you hold both properties inside one company, but keep their money and debts separate. The lawsuit against property A does not reach the cash from property B.
It looks like a small structural choice. It is actually a technique that only some states allow, and it requires very specific paperwork to work. Get it wrong, and it gives you none of the protection you thought you bought.
What a series LLC actually is
A series LLC is a single limited liability company that is divided into separate internal divisions. Delaware calls each division a "protected series." Wyoming calls it a "series." Each series holds its own assets and liabilities.
Think of it as a master LLC with internal compartments. The master company files one certificate of formation with the state. Inside, you set up multiple series, each with its own members, its own capital, and its own operations.
This is different from forming multiple separate LLCs. That would require a separate state filing and separate paperwork for each one. A series LLC avoids some of that while trying to keep the liability separation. It does not avoid all of it, as the California section below shows.
How it protects assets
The protection works only if three conditions are met. All three have to be true, or the entire separation disappears:
-
Your operating agreement must describe the series. You cannot just announce that you have a series. The LLC's written agreement has to spell out what each series is, how it operates, and who manages it.
-
Each series has to keep its own records. Both statutes require records that account for the assets of a series separately from the assets of the LLC and of every other series. Separate books are not just good practice here. They are a condition of the liability shield, and a creditor will ask to see them.
-
Your certificate of formation (or articles of organization, depending on the state) has to include notice. Delaware requires notice of the limitation on liabilities of a protected series in the certificate of formation (6 Del. C. § 18-215(b)). Wyoming requires the same notice in the articles of organization (W.S. § 17-29-211(c)). In both states the notice does not have to name any specific series. A general statement is enough, and it works even if you have not established any series yet.
If all three are in place, then creditors can only reach the assets of the series that owes the debt. The assets of other series stay protected.
If any one of the three is missing, many courts and creditors will treat the whole thing as failed, and you lose the separation entirely.
Where they are allowed
Not all states recognize series LLCs. Delaware and Wyoming both do, and several other states have series statutes of their own. Many states have none.
Delaware recognizes protected series under 6 Del. C. § 18-215 and is a common place to form one. Delaware also has a second, newer form called a "registered series" (6 Del. C. § 18-218), which is filed with the state and gets its own certificate. The two are not the same thing, so be clear about which one your paperwork actually creates.
Wyoming recognizes series under W.S. § 17-29-211. The three conditions are the same in substance as Delaware's: an operating agreement that provides for the limitation on liabilities, separately maintained records of each series' assets, and notice in the articles of organization.
California does not let you form a series LLC as a California company. But if you form one in Delaware or Wyoming and then do business in California, California will deal with it, and the bill is worse than founders expect:
- The LLC has to register with the California Secretary of State before it starts doing business in the state.
- For California annual tax and fee purposes, the Franchise Tax Board treats each series as a separate LLC. Every series that is registered or doing business in California files its own Form 568 and pays its own annual tax, plus the separate LLC fee if that series' California income is high enough to trigger it.
- Only the first series uses the Secretary of State file number as its identification number. The FTB assigns identification numbers to the rest.
Fee and tax amounts change, so check the current figures with the state rather than trusting a number in an article: FTB Series LLC guidance and the FTB LLC annual tax and fee page.
The practical point is that a series LLC does not buy you a discount in California. If several of your series do business there, you file several returns and pay several times, which is exactly what you were trying to avoid.
🇺🇸 If the IRS counts you as a U.S. person
You can form a series LLC and use it to separate assets and liabilities. The same rules apply to you as to anyone else forming a series LLC in your state.
What matters is the structure of the LLC itself, not who owns it. A U.S. person and a non-resident can set up identical series LLCs and get the same liability separation.
Federal tax treatment of the series is unsettled, and you should not let anyone tell you otherwise. In 2010 the IRS proposed a rule (REG-119921-09) that would treat each domestic series as an entity formed under local law for federal tax purposes, meaning each series would be classified on its own. That rule was never finalized. The current regulation, 26 CFR § 301.7701-1, still contains no series provision.
So there is no final IRS answer on whether one return covers the whole LLC or each series files separately. If the proposed rule is ever finalized as written, series that had been reported as one entity would have to change. Take this to a tax preparer before you assume a single return covers everything, and note that California already treats each series as a separate LLC for its own annual tax and fee.
🌏 If it does not
The same answer applies. Your ability to form and use a series LLC depends on the state where you register the LLC, not on whether you are a U.S. person.
A non-resident can register a series LLC in Delaware or Wyoming just as a U.S. person can. The paperwork is the same, and the liability separation works the same way.
However, if your series do business in California or another state that taxes each series separately, you face the same multi-series tax burden that anyone faces. The unsettled federal treatment described above applies to you too.
What stays the same between the two groups
| Aspect | Both groups |
|---|---|
| Where it works | Delaware, Wyoming, and some other states. Not everywhere. |
| Required paperwork | Operating agreement providing for the series, separate records of each series' assets, and notice in the certificate of formation or articles of organization. |
| Liability separation | If all three conditions are met, each series is liable for its own debts and its assets are shielded from creditors of another series. |
| Federal taxation | Unsettled. The IRS proposed a separate-entity rule in 2010 and never finalized it. |
| California | Each series registered or doing business there is a separate LLC for the annual tax and fee. It files its own Form 568 and pays its own tax. Check the FTB for current amounts. |
| Key risk | If you fail to keep separate records or to include the notice in your state filing, the statutory shield does not apply and all assets can be treated as one pool. |
The series LLC is a structural choice, not an ownership or citizenship choice. It works the same way regardless of who is involved.
Common mistakes
Both groups
- Assuming the series is separate for all purposes. It is not. The master LLC still exists as one legal entity. Liability separation only goes as far as the state allows, and not all states recognize it. Some creditors will challenge it, and courts sometimes deny the separation if the paperwork is incomplete.
- Forgetting to keep separate records. Separate records of each series' assets are a condition of the shield in both the Delaware and Wyoming statutes. If your bookkeeping mixed everything together, the condition is not met.
- Putting the notice in the wrong place. The notice has to go in the certificate of formation or articles of organization filed with the state. Putting it only in your operating agreement does not satisfy the statute.
- Assuming California will be cheaper. Founders set up a Wyoming series LLC expecting to pay less than they would for several LLCs. Then they find that California treats every series doing business there as its own LLC for the annual tax and fee, so the cost repeats per series and the advantage disappears.
- Confusing series with a parent-subsidiary structure. A series LLC is not the same as owning multiple subsidiary companies under one parent. The series are not separate legal entities. They are divisions of one entity, and their separation comes from a state statute that only works if you meet its conditions.
FAQ
What is the difference between a series LLC and multiple separate LLCs?
Multiple separate LLCs are each their own legal entity, with separate state filings and separate tax returns. A series LLC is one LLC divided into internal series, so you make one formation filing with the state. The savings are smaller than they look: federal tax treatment of the series is unsettled, and California charges per series. Series LLCs are also more complex and not recognized everywhere.
Do I have to use all three pieces of the series structure?
Yes. The operating agreement has to provide for the series, the records of each series' assets have to be kept separately, and the notice has to be in your certificate of formation or articles of organization. Both the Delaware and Wyoming statutes make all three conditions of the liability shield. Skip one and the shield does not apply.
If I form a series LLC in Delaware but operate in California, do I pay twice?
Yes, and possibly more than twice. The LLC registers with the California Secretary of State. Then, for the California annual tax and fee, the Franchise Tax Board treats each series that is registered or doing business in the state as a separate LLC. Each one files its own Form 568 and pays its own tax, plus the LLC fee if its California income is high enough. Check the FTB for current amounts.
Can a non-resident own a series LLC?
Yes. A series LLC is formed the same way and works the same way whether the owner is a U.S. person or a non-resident. The state does not care who owns it, only that the paperwork is in place.
Is a series LLC taxed as one entity or multiple entities?
For federal income tax there is no final answer. The IRS proposed a rule in 2010 (REG-119921-09) that would treat each series as its own entity, but it was never finalized and 26 CFR § 301.7701-1 still has no series provision. States set their own rules regardless: California treats each series doing business there as a separate LLC for the annual tax and fee. Get a tax preparer involved before you file.
What happens if a series fails in court?
If a creditor sues and the conditions in the statute were not met (no operating agreement provision, records that were never kept separately, or missing notice in the state filing), the statutory shield does not apply to that series. The LLC's assets can then be reached as one pool rather than only the assets of the series that was sued.
Does every state recognize series LLCs?
No. Delaware and Wyoming do. Several other states have series statutes with their own variations, and many states have none. Before forming a series LLC, verify that the states where you actually operate will respect it, not just the state where you file.