What Is a Series LLC?
A Series LLC is a unique type of LLC structure that allows a single parent LLC to create separate "series" — essentially sub-LLCs — each with its own members, managers, assets, and liabilities. The critical feature is liability isolation: debts and obligations of one series generally cannot be enforced against the assets of another series or the parent LLC.
Think of it like an apartment building where the LLC is the building and each series is a separate unit with its own locks. What happens inside one unit doesn't affect the others.
Which States Allow Series LLCs?
Series LLCs are available in a growing number of states, including:
- Delaware (the pioneer — authorized Series LLCs in 1996)
- Illinois
- Iowa
- Nevada
- Oklahoma
- Tennessee
- Texas
- Utah
- Wyoming
- Several others with varying levels of statutory support
However, not all states recognize the liability isolation of a Series LLC formed in another state. If your Series LLC does business in a state that doesn't recognize series structures, the liability barriers between series may not hold up.
Before forming a Series LLC, verify that the states where you'll do business recognize series structures. If you operate in states that don't, you may need to form separate traditional LLCs instead to ensure liability isolation.
How Series LLC Operating Agreements Work
A Series LLC typically has two levels of governing documents:
The Master Operating Agreement
This governs the parent LLC and establishes the framework for creating and managing individual series. It covers:
- Formation and purpose of the parent LLC
- General provisions that apply to all series
- Procedures for creating new series
- Procedures for dissolving individual series
- Shared services and overhead allocation
- Overall management structure
- Amendment procedures
Individual Series Agreements
Each series can have its own operating agreement (sometimes called a "series supplement" or "series designation") that addresses:
- Members of that specific series (they can differ from series to series)
- Capital contributions specific to that series
- Profit and loss allocation for that series
- Management of that series
- Assets assigned to that series
- Liabilities specific to that series
- Dissolution procedures for that series
Key Provisions for Series LLC Operating Agreements
Asset Segregation
The most important aspect of a Series LLC operating agreement is maintaining clear separation between series assets. Each series should:
- Have its own bank account
- Maintain separate books and records
- Own its assets in its own name (or clearly designated as series assets)
- Not commingle funds with other series or the parent LLC
- Maintain separate financial statements
Why this matters: If assets aren't properly segregated, courts may disregard the liability barriers between series. Treat each series as if it were a completely separate entity for asset management purposes.
Separate Capital Accounts
Each series needs its own set of capital accounts tracking:
- Contributions made to that specific series
- Profits and losses allocated to that series' members
- Distributions made from that series
- Each member's economic interest in that series
Cross-Series Protections
Your master operating agreement should include provisions that:
- Prohibit one series from guaranteeing another series' debts
- Prevent commingling of series assets
- Require separate record-keeping for each series
- Establish procedures for inter-series transactions (which should be at arm's length)
- Clarify that creditors of one series have no claim against other series
The liability isolation in a Series LLC depends on strict compliance with separation requirements. If you commingle assets, fail to maintain separate records, or don't clearly designate which assets belong to which series, courts may collapse the liability barriers. Treat each series as a distinct entity.
Management of Individual Series
Each series can have a different management structure:
- Series A might be member-managed with two active members
- Series B might be manager-managed by the parent LLC
- Series C might be managed by a non-member professional manager
Your master operating agreement should establish the default management structure and allow individual series agreements to override it.
Shared Expenses and Overhead
Address how expenses that benefit multiple series are allocated:
- Accounting and tax preparation
- Legal fees for entity maintenance
- Registered agent fees
- Insurance premiums
- Office space and administrative costs
Common allocation methods include equal division among active series, proportional to each series' revenue or assets, or based on actual usage.
Common Uses for Series LLCs
Real Estate Investment
The most popular use. Each property (or group of properties) is held in a separate series. If a tenant sues over a slip-and-fall at Property A, only the assets of Series A are at risk — not Properties B through Z.
Multiple Business Lines
An entrepreneur running several distinct businesses can house each one in a separate series, isolating the liabilities of each business from the others.
Investment Funds
Series structures can separate different investment strategies or investor groups within a single fund, each with its own risk profile and member composition.
Intellectual Property Holdings
Different IP assets (patents, trademarks, copyrights) can be held in separate series, isolating the risks associated with each asset.
Tax Considerations
The IRS has not issued definitive guidance on how Series LLCs are taxed. The current approach depends on whether each series is treated as a separate entity for tax purposes:
- If each series is treated as a separate entity, each files its own tax return (or is treated as a disregarded entity if it has a single member)
- If the entire Series LLC is treated as a single entity, one return covers all series
Most tax professionals treat each series as a separate entity for federal tax purposes, which means each series needs its own EIN and files its own return. Your master operating agreement should address the tax treatment and require each series to maintain the records necessary for compliance.
Potential Drawbacks
Uncertain Legal Recognition
Not all states recognize Series LLCs, and there's limited case law testing liability isolation between series. This creates uncertainty about whether the barriers will hold up in every situation.
Administrative Complexity
Each series requires its own record-keeping, bank accounts, and financial statements. For LLCs with many series, the administrative burden can be significant.
Banking Challenges
Some banks are unfamiliar with Series LLCs and may have difficulty opening accounts for individual series. You may need to work with banks experienced in this structure.
Insurance Complications
Insuring a Series LLC can be complex. Insurers may require separate policies for each series, or they may not understand how to properly underwrite the structure.
Making the Decision
A Series LLC operating agreement is more complex than a standard operating agreement, but for the right situation — particularly real estate investors with multiple properties — the benefits of liability isolation without the cost of forming multiple separate LLCs can be significant.
If you're considering a Series LLC, make sure you understand your state's specific requirements, commit to maintaining strict separation between series, and create comprehensive operating agreements at both the master and individual series levels.