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Editorial 6 MIN READ

Series LLC, a decade in: what the form actually delivers

Twenty-plus states now recognize it, the IRS still hasn't finalized its rule, and most founders should still skip it

The Editors
Staff, Incorporator.org
6 min read Updated
Contents 6 sections
  1. Where the statute lives and who has one
  2. The federal tax rule that never finalized
  3. What happens when one series gets sued
  4. The CTA question, still open as of this writing
  5. Who should actually use this form in 2023
  6. Sources

Series LLC lets a single master LLC hold an indefinite number of internal cells, each with its own assets, members, and liability shield. Delaware invented it in 1996. Twenty-seven years later, the form still has no finalized federal tax rule, no uniform bankruptcy treatment, and a live question about how each series reports under the Corporate Transparency Act.

This is a reappraisal for someone who has heard the pitch and wants to know whether the form has actually earned the hype.

Where the statute lives and who has one

Delaware authorized the Series LLC in 1996 under 6 Del. C. § 18-215, which provides that a series may have separate rights, powers, duties, and assets, and that debts of one series are enforceable only against that series' assets so long as the operating agreement and the public record say so and the books are kept separately. The provision is three dense subsections. Every state that followed borrowed from it.

By early 2023 the count of enacting jurisdictions sits north of twenty. Delaware, Illinois, Iowa, Kansas, Missouri, Montana, Nevada, Oklahoma, Tennessee, Texas, Utah, the District of Columbia, North Dakota, Nebraska, Alabama, and Wisconsin all have some form of series statute on the books, with additional states following the Uniform Protected Series Act framework the Uniform Law Commission finalized in 2017. Florida took a different path and built a "protected series" regime inside its revised LLC chapter, Fla. Stat. ch. 605. California, New York, and Massachusetts never adopted. A California franchise-tax posture that treats each series as a separately taxable LLC owing the $800 minimum under R&TC § 17941 has done more to suppress West Coast adoption than any statute ever could.

Formation mechanics differ by state. Delaware does not require a separate filing to create a new series once the master exists; designation happens inside the operating agreement. Illinois charges a filing fee to register each series publicly and requires its own designation. Texas sits in between.

The federal tax rule that never finalized

This is the load-bearing awkwardness of the whole form. The IRS issued Prop. Reg. § 301.7701-1(a)(5) in September 2010 announcing that each domestic series would be treated as a separate entity for federal tax purposes regardless of how state law classifies it. Each series would elect its own check-the-box classification, file its own return, and carry its own EIN.

Thirteen years in, that regulation remains proposed. It has not been finalized and it has not been withdrawn. Preamble language invites taxpayers to rely on it, and practitioners generally do, but "rely on a proposed reg from 2010" is a sentence no tax lawyer enjoys saying to a client. The IRS has not issued clean guidance on EIN procedure for each cell, on how partnership audits run when one series is audited and another is not, or on how K-1 reporting aggregates when members differ across series.

State tax treatment is its own mess. Some states conform to the proposed federal rule; others tax the master entity as a single payer; California's Franchise Tax Board has consistently taken the position that each series doing business in California owes the $800 annual tax on its own under R&TC § 17941. For a ten-cell Series LLC with California real estate in each cell, that is $8,000 a year before you file your first return.

What happens when one series gets sued

The internal shield under 6 Del. C. § 18-215(b) is supposed to wall off the debts of Series A from the assets of Series B so long as the formalities are kept. In the sued state, if the sued state has also enacted a series statute and recognizes the internal shield, that theory usually holds.

What happens when the sued state has no series statute is less clean. Bankruptcy courts have been the place where the Series LLC theory has had the roughest time, because a bankruptcy judge in a non-adopting state is under no obligation to treat the series as a separate person, and several have declined to. Practitioners have spent the last decade pointing at federal bankruptcy cases where a court declined to treat a foreign series as a separate debtor, reasoning that federal bankruptcy law, not the forum state's enacted statute, controls whether a purported subdivision can file its own petition.

The conservative reading in 2023: the internal shield is robust inside adopting states and in the master's state of formation. The shield is fragile when a series owns assets in a non-adopting state, when suit is brought in a non-adopting state, or when the forum is federal bankruptcy. Ten years of case law has not moved that reading.

The CTA question, still open as of this writing

The Corporate Transparency Act, 31 U.S.C. § 5336, takes effect January 1, 2024. FinCEN issued the final beneficial-ownership reporting rule in September 2022 at 31 CFR § 1010.380, defining "reporting company" to include any entity created by the filing of a document with a secretary of state or similar office.

A Series LLC's master is obviously a reporting company. Every individual series is less obvious. FinCEN's preamble suggests that a series formed by a state filing is a separate reporting company; a series created solely by operating-agreement designation without a state filing may not be. That distinction maps onto the Delaware versus Illinois split: Delaware series that exist only in the operating agreement may not file their own BOI report, while Illinois series registered with the Secretary of State each will. Practitioners have been asking for clarification ever since the rule dropped. For a Series LLC holding a dozen cells, the compliance math matters.

Who should actually use this form in 2023

Three genuine use cases have survived the decade.

Captive insurance is the first. The Series LLC and its sibling the segregated-cell insurance company are workhorses of the captive world. Separate underwriting, separate reserves, and a clean internal shield matter for a captive in a way they rarely do elsewhere. Domicile choice (Vermont, Delaware, Utah, or an offshore jurisdiction) is the conversation that matters more than the federal tax question.

Multi-property real estate is the second. A sponsor who owns fifteen properties in three states has a choice between fifteen separate LLCs, with fifteen annual reports and fifteen registered agents, or one Series LLC with fifteen cells. In a state that has adopted, that saves a meaningful amount of friction. In a portfolio that crosses into California or New York, it can add friction rather than save it.

Fund-of-funds and master-feeder structures are the third, where the sponsor wants separate investor pools in different cells. Onshore, the Delaware Series LLC is the standard answer.

Outside those three, the Series LLC in 2023 is usually oversold. A two-member operating company does not benefit. A consultant with a side LLC does not benefit. The administrative overhead of keeping series books separate, which 6 Del. C. § 18-215(b) explicitly requires, tends to be ignored until there is a dispute, at which point the plaintiff's lawyer asks for the separate accounting and there isn't any.

The 2010 proposed regulation is the clearest evidence that the federal government has never been quite sure what to do with this form. Until the final regs arrive, a Series LLC is a calculated bet that the proposed rule will finalize roughly as drafted, that your forum state will continue to recognize the shield, and that your administrative hygiene will hold up under an adversary's scrutiny. For a captive or a multi-property sponsor, that bet is reasonable. For everyone else, two ordinary LLCs usually do the job.

Sources

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