What Is a Series LLC?

A series LLC is one company with separate series that isolate assets and liabilities. How it works, where it's allowed, and if it's right for you.

A series LLC is a single limited liability company that contains separate series, each with its own assets, liabilities, members, and management. The design lets you isolate risk across different ventures under one umbrella company.

The short answer: a series LLC divides one LLC into several compartmentalized series, so a lawsuit against one series does not reach the assets of another. It is powerful, but it is only available in certain states and carries ongoing complexity.

How a series LLC works

You form one LLC and then create series within it, often by filing a series designation and keeping separate records for each. Each series acts like its own company: separate bank accounts, separate books, and separate assets and liabilities.

The key feature is liability isolation: if one series is sued or loses money, creditors generally cannot reach the assets of other series. That makes series LLCs popular for real estate investors who own multiple properties.

Naming and registering series

Each series must have a name that is distinguishable from the others, and most series states require you to file a notice of series designation or list the series in your formation documents. The series name typically includes the LLC's name plus a distinguishing element, such as "Series A" or a property-specific label.

Some states require a separate filing and fee for each series, while others let you create series simply by amending your operating agreement. Confirm the registration rules in your formation state, because a series that is not properly established may not get the liability protection you expect.

Where series LLCs are allowed

The series LLC is recognized in roughly a dozen states plus Puerto Rico, including Delaware, Nevada, Texas, Illinois, and Oklahoma, among others. Rules vary by state, and some states cap liability protection, so confirm how your formation state treats series.

If you operate in a state that does not recognize the series concept, the protection may not hold up there. Forming in a series-friendly state and registering in others is a common but complex strategy.

Pros of a series LLC

The main benefit is cost and efficiency: instead of forming several separate LLCs and paying multiple filing fees and annual reports, you file one LLC and create series under it. You also centralize management and registered agent duties.

Each series keeps its own finances and legal exposure, giving you the asset-isolation benefit of separate companies with fewer filings.

Cons and risks

The drawbacks are meaningful. Courts in states that do not recognize series LLCs may not respect the liability isolation. Within a series LLC, you must keep each series's records scrupulously separate or the protection evaporates.

Banks and lenders can be reluctant to work with series LLCs because the structure is unfamiliar and statutes are evolving. Compare the structure against forming separate LLCs with your advisor.

How a series LLC is taxed

By default, a series LLC is taxed as a single entity, with all series reported together on one return. If the series have separate members, the tax treatment can get complicated, and some states tax each series separately.

Because tax rules for series LLCs are unsettled in several jurisdictions, it is important to work with a tax professional. Your operating agreement should also specify how series share the overall structure.

Is a series LLC right for you?

A series LLC makes sense if you own multiple, asset-heavy ventures — like several rental properties — and want isolation without the cost of separate LLCs. It is less useful for a simple one-owner business.

Forming any LLC starts the same way, so how to start an LLC applies. As of 2026, series LLCs remain a specialty structure: valuable in the right circumstances, but not a default choice.

Frequently Asked Questions

Which states allow series LLCs?

Roughly a dozen states recognize series LLCs, including Delaware, Nevada, Texas, Illinois, and Oklahoma, plus Puerto Rico. Rules vary, and some states limit the liability protection. Confirm how your formation state handles series before forming one.

How is a series LLC taxed?

By default, a series LLC is taxed as a single entity, with all series combined on one return. Some states tax series separately, and multi-member series can complicate the picture. Consult a tax professional for your specific situation.

Is a series LLC a separate legal entity?

It is one LLC that contains separate series. Each series can hold its own assets and liabilities, and in most series states, liabilities are isolated between series. The LLC itself is one filing entity.

Can I use a series LLC for real estate?

Yes, real estate investors commonly use series LLCs to hold different properties in separate series, isolating the risk of each property. Because rules vary by state, work with a local attorney before structuring a portfolio this way.