Organizations and individuals form Series LLCs to limit liability and protect assets. Series LLCs have become increasingly popular as a way to silo different businesses or organizations while they remain under one central LLC umbrella.

The problem with this type of LLC is that they aren't recognized by every state. States that allow Series LLCs each set their tax reporting and filing requirements, meaning taxpayers need to know the specific requirements for each state. Arizona, for example, doesn't recognize Series LLCs and treats Series LLCs from other states as foreign LLCs.

At the federal level, as of 2026, the IRS doesn't have regulations on how to file taxes for Series LLCs. The agency has, however, issued guidance. While this guidance isn't binding, it highlights how, if the IRS audits an organization that uses Series LLCs, the lack of regulations can complicate the audit. It can also make it more difficult for taxpayers to know if they're in compliance.

Does the IRS Recognize Series LLCs?

At the federal level, organizations that use Series LLCs can choose to file taxes as a single entity or for each LLC. The IRS has issued non-binding guidance that recommends filing taxes for each entity.

Tax considerations for Series LLCs:

• Is the LLC a single-member series or a multi-member series?
  • In general, multi-member series are treated as a partnership.
• How independent is each entity?
  • Does each series have its own business operations? Employees? Its own tax elections?
• Does the state in which the LLC is registered recognize each series as a separate legal entity for tax purposes, or is each required to file separately?
• How does each entity manage documentation and other records and files?

When the IRS flags an organization that uses Series LLCs, the agency will be looking for any indicator that the LLCs are intended to avoid taxes. Regardless of how an organization chooses to file taxes, one of the most important considerations is to select an option that will minimize issues with the IRS.

If you have questions about LLCs and taxation, call Senior Partner, Tax Controversy Attorney, and former IRS attorney Brandon A. Keim at (602) 200-7399 or contact him online to discuss your options.