Series LLC

A Series LLC is a parent LLC organized into multiple sub-LLCs (called "series" or "cells"), each maintaining separate assets, members, and liability protection. A judgment against one series does not affect other series of the same parent LLC, providing internal asset separation without requiring multiple complete LLCs.

A Series LLC is a parent LLC organized into multiple sub-LLCs (called "series" or "cells"), each maintaining separate assets, members, and liability protection. A judgment against one series does not affect other series of the same parent LLC, providing internal asset separation without requiring multiple complete LLCs. The concept is foundational to US business law and tax practice. Most founders encounter series llc either at formation, during major business changes, or in connection with compliance filings.

Series LLCs originated in Delaware's 1996 LLC Act. The structure was initially developed for mutual fund and investment fund use, where each series represented a separate fund. The structure has since expanded to real estate investment, intellectual property holding, and other multi-asset business models. Sixteen states currently recognize Series LLCs.

Series LLC typically applies in these situations:

• At formation. Many of these concepts are decided when the entity is first created.
• During growth stages. As businesses scale, the concept may become more relevant or change in application.
• Tax planning. Most concepts in this area have direct tax implications.
• Liability and asset protection. Many of these structures exist primarily to manage legal and financial risk.
• Investor and M&A activity. Funded startups and acquisition targets need precise compliance with these concepts.

1. Research applicable rules. Series LLC is governed by a combination of federal (IRS, FinCEN) and state law. Verify current rules.
2. Gather required information. Most filings require entity details, identifying information, and supporting documentation.
3. Complete the form or filing. Federal filings typically go to IRS, FinCEN, or USPTO. State filings go to the Secretary of State or applicable state agency.
4. Pay any applicable fees. Federal fees vary; state fees range from free to several hundred dollars depending on filing type.
5. Maintain documentation. Keep filed copies and supporting records for at least 7 years for tax purposes.
6. Track ongoing compliance. Many concepts in this area trigger ongoing filing or reporting requirements.

• Missing deadlines. Federal and state deadlines for filings related to series llc are strict. Missing them often results in penalties.
• Incorrect classification. Many concepts have multiple sub-types that affect treatment. Get the classification right at the start.
• Inadequate documentation. When something goes wrong, documentation determines outcomes. Maintain clear records.
• Ignoring state variations. US business law varies significantly state-to-state. What's true in Delaware may differ in California.
• DIY without verification. Series LLC can be DIYed, but mistakes are expensive. Verify with a professional when uncertain.

Costs associated with series llc vary by type, state, and complexity. File.Business handles most series llc services as part of our compliance plans (starting at $99/yr); we pass through state and federal filing fees at cost. Compare specific cost breakdowns across all 51 jurisdictions using our cost-by-state calculators.