Series LLC vs Multiple LLCs: Which Structure Fits?

By {AUTHOR_COMPLIANCE_NAME}, Tax & Regulatory Compliance Lead

Published June 1, 2025 · Updated May 15, 2026

When you need liability isolation across multiple assets or business lines, two structures compete: Wyoming's Series LLC under SS 17-29-1101 and multiple individual LLCs. Each provides asset compartmentalization but with different cost profiles, administrative requirements, and legal certainty. This guide compares both structures head to head.

Multiple Individual LLCs Overview

The traditional approach to asset isolation is forming a separate LLC for each asset or business line. Each LLC is an independent legal entity with its own Articles of Organization filed with the Wyoming Secretary of State, its own EIN obtained from the IRS, its own bank account, its own operating agreement, and its own annual report filing. Liability isolation is straightforward: because each LLC is a distinct legal person recognized in every US jurisdiction, the debts and liabilities of one entity cannot reach assets held by another entity. There is no question of state recognition because LLCs are universally acknowledged across all fifty states. Each LLC receives its own charging order protection under SS 17-29-503(a). The disadvantage is cost and administrative overhead. Each entity requires its own formation filing ($497 at CSF), its own annual report ($60), its own registered agent ($100/year), its own tax returns (if multi-member), and its own compliance tracking. For portfolios with many assets, the costs multiply quickly.

Liability Isolation: Legal Certainty

Both structures provide liability isolation, but the legal certainty differs. Individual LLCs have decades of case law supporting their separate legal existence. Courts universally recognize that the liabilities of one LLC do not attach to another independently formed LLC, absent veil piercing. This recognition is not dependent on any particular state's Series LLC statute. Series LLCs have less case law precedent. While the statutory framework is clear in Wyoming and the approximately 20 other states with Series LLC statutes, courts in states without Series legislation have not been extensively tested on whether they will honor the inter-series liability shields. A lawsuit filed in a non-Series state against a series asset raises the question of whether that state's courts will recognize the internal liability barriers. The Uniform Protected Series Act (adopted in a few states) provides a framework for interstate recognition, but adoption is not yet widespread. For assets located in states without Series LLC statutes, individual LLCs provide stronger legal certainty.

Wyoming Statute SS 17-29-1101; Uniform Protected Series Act (2017)

State Recognition Challenges

Approximately 20 states currently have Series LLC statutes, including Wyoming, Delaware, Illinois, Texas, Nevada, and Iowa. In these states, the internal liability shields between series are recognized by statute and courts. However, many states do not have Series LLC legislation, including major business states like California, New York, Florida, and Massachusetts. When a Series LLC holds assets or conducts business in a non-Series state, several issues arise. First, the series may need to register as a foreign LLC in that state, and the state may not have a mechanism for registering individual series as opposed to the master entity. Second, if a lawsuit arises in a non-Series state, the court may not recognize the liability shields between series. Third, title insurance companies in some states will not insure real property titled to a series within a Series LLC. These recognition issues are the primary reason asset protection attorneys recommend individual LLCs for multi-state real estate portfolios.

Decision Framework: Series vs Multiple

Choose a Series LLC when your assets are concentrated in states that recognize Series LLCs, you are cost-sensitive and managing five or more assets, you do not require institutional financing that mandates separate entities, and you are comfortable working with banks that accommodate Series LLC accounts. Choose multiple individual LLCs when your assets span multiple states including non-Series states, you use institutional lenders who require separate entity ownership, you prioritize maximum legal certainty and case law support, and administrative simplicity per entity outweighs the cost savings. In either case, maintain a formal operating agreement, separate accounting for each asset or series, adequate insurance per property or business, and annual compliance filings. Both structures provide charging order protection under Wyoming law. Both require disciplined entity maintenance to prevent veil-piercing arguments. The choice is primarily about cost optimization versus legal certainty in multi-state scenarios.