A parent-subsidiary LLC structure gives you real liability separation, and that separation is conditional. Courts respect it only while you run each entity as its own business. Every subsidiary you add also brings its own filing deadlines, its own registered agent, and its own state tax bill wherever it's registered.
One LLC can own another. Most state statutes let a single holding company own every subsidiary beneath it, so the structure itself is unremarkable. What decides whether it holds up is how you document it and what you do every year afterward.
Can one LLC own another LLC?
Yes, and in most states nothing special is required to do it. IRS guidance on LLCs states that "Most states do not restrict ownership, so members may include individuals, corporations, other LLCs and foreign entities." An LLC can therefore be the sole owner, or member, of another LLC. The one at the top is usually called a holding company.
Each entity in the chain keeps its own liability shield. Under 6 Del. C. § 18-303(a), an LLC's debts belong to the LLC alone, and no member or manager owes them personally. Most state LLC acts say something close to this, though the wording varies.
Should you build a parent-subsidiary structure?
Only if you have two things worth keeping apart. The structure earns its cost when a business that could be sued sits next to an asset you'd rather it couldn't reach.
What a two-subsidiary structure looks like
The shape is simple. One holding company sits at the top, and each business or asset goes into its own subsidiary underneath.
Say you run Ridgeline Holdings LLC in Delaware. It owns Ridgeline Fabrication LLC, which operates a shop in Ohio, and Ridgeline Property LLC, which holds the building the shop sits in. A products claim against Fabrication reaches Fabrication's assets. It doesn't reach the building, and it doesn't reach Holdings, as long as all three are run as separate businesses.
When it isn't worth building
Two entities cost roughly twice what one costs, every year, indefinitely. Each needs a registered agent and a filing in its formation state. Each needs another set of both wherever it operates, which is why managing annual report filings across entities becomes its own job.
If you run one line of business in one state, a single LLC with adequate insurance usually does more for you than a holding company would.
Series LLC or separate subsidiaries?
For most operations that cross state lines, separate subsidiaries. A series LLC does a similar job differently. Instead of separate entities, one LLC creates internal units called protected series, and each holds its own assets and liabilities behind its own shield. That means fewer filings and one parent.
The catch is geography. Only a minority of states authorize a series LLC, and states differ on how they treat a series formed somewhere else. A structure that works cleanly at home can become an open question where you expand.
Florida is the most recent addition. Its Uniform Protected Series Provisions, Fla. Stat. §§ 605.2101 to 605.2802, took effect July 1, 2026. They follow the Uniform Protected Series Act that the Uniform Law Commission published in 2017.
Separate subsidiaries cost more in filings. In exchange, you get a structure that doesn't raise the recognition question anywhere.
Form the holding company and each subsidiary
File a separate formation document for the holding company and for every subsidiary. What that document is called depends on the state.
Many states call it Articles of Organization. Delaware and Texas call it a certificate of formation, and Delaware's LLC Act requires one before the company legally exists.
Employer identification numbers work differently. A holding company with more than one member generally needs its own, applied for on Form SS-4. A subsidiary with a single member often needs none at all. Under the single-member LLC rules, it can use its owner's name and taxpayer identification number instead. That holds as long as it has no employees and owes no excise taxes. It needs its own employer identification number (EIN) once it pays wages, and a bank or a state tax office may ask for one sooner.
Document the ownership and fund each subsidiary
Name the holding company as the sole member in each subsidiary's operating agreement. That agreement is the only place the ownership is written down, and in California and most other states it never gets filed with anyone. If nobody can produce it, there's no record of who owns what.
Bringing an existing LLC into the structure works a little differently. Its members assign their ownership stakes up to the holding company, and that changes how the subsidiary is taxed. Acquiring 100% of a multi-member LLC's interests terminates its partnership status, and the IRS then treats it as part of its owner. Adding a second member to a single-member subsidiary does the reverse and makes it a partnership.
Then fund each subsidiary against the liabilities it can foreseeably run into. Underfunding one is a fact courts weigh when someone asks them to disregard the structure.
Register each subsidiary where it operates
Each subsidiary counts as a local company only in the state that formed it. Operating anywhere else usually means registering in that state too, a step some states call qualification and others call getting a certificate of authority.
An office, employees, or income-producing property in a state means registering there and appointing a registered agent. California asks a subsidiary registering there for a certificate of good standing from its formation state. New York wants the same document under a different name, a Certificate of Existence, and charges $250 for the application for authority.
The holding company usually doesn't have to register just because it owns a subsidiary in that state. Here is how the duties divide.
Obligation | Holding company | Each subsidiary |
|---|---|---|
Formation filing and registered agent in its home state | Yes | Yes |
Annual or biennial state filing | Yes | Yes |
Registration where it has an office, staff, or property | Yes | Yes |
Registration triggered only by owning a subsidiary | Usually no | Not applicable |
The exemptions behind that fourth row are narrower than they look. Florida Statutes § 605.0905(1)(k) excludes owning and controlling a subsidiary corporation or limited liability company. New Mexico's LLC Act excludes only a controlling interest in a corporation (NMSA § 53-19-54(B)(1)), which is not the arrangement described here. If you're working out which states apply, Discern's multi-state foreign registration guide goes further into the analysis.
How each subsidiary is taxed federally
If a subsidiary has one member, the IRS ignores it for income tax and treats its activity as the owner's. The term for that is disregarded status, and it's the default.
By default, a single-member subsidiary files no return
A subsidiary in this position files no income tax return of its own. Its income, deductions, gains, losses and credits go on the owner's return instead, per IRS Publication 3402.
Payroll is the exception. The same publication treats a single-member LLC "as a separate entity for purposes of employment tax and certain excise taxes." A subsidiary with employees therefore files those returns under its own name and EIN.
Changing how a subsidiary is taxed
You can elect a different treatment on Form 8832, but the timing rules are strict and close to irreversible. Under Treasury classification regulations, the date you choose can't be more than 75 days before you file or more than 12 months after. The same regulation then blocks another election for 60 months, unless the first one took effect on a brand-new LLC's formation date.
Get tax advice before you file this one. It's the step you can't quietly undo.
Do you owe a beneficial ownership report?
If your entity was formed in the United States, currently no. Per the FinCEN BOI page, an interim final rule dated March 26, 2025 exempts entities created in the United States and their beneficial owners. FinCEN is also not enforcing beneficial ownership information (BOI) penalties against domestic companies.
Entities formed outside the United States are treated differently. Those that became reporting companies on or after that date generally file within 30 calendar days. The clock starts when they're notified their registration is effective. They don't report their U.S.-person owners. A final rule is expected, so watch for changes if any of your entities were formed abroad.
Ongoing state filings multiply with each subsidiary
Every subsidiary owes the same set of state filings the holding company owes, in every state where it's registered. The due dates don't line up.
Delaware raised its annual LLC tax from $300 to $400 this year, retroactive to January 1, 2026, under House Bill 400. Fifty Delaware entities now cost $20,000 a year on that line alone. Amounts and dates change, so confirm each against current state instructions before you file.
Penalties attach automatically and differ by state. Delaware charges $200 plus 1.5% monthly interest from the day after the June 1 deadline, and under 6 Del. C. § 18-1108(a) it cancels the certificate of formation once the tax goes three years unpaid. Florida charges a $400 late fee after May 1. A Florida subsidiary that misses the third Friday of September is then shut down by the state, at the close of business on the fourth Friday.
Missing a registration carries a sharper consequence. If a subsidiary isn't registered where it does business, you can lose the right to bring a lawsuit in that state. In Drake Manufacturing Company, Inc. v. Polyflow, Inc., 109 A.3d 250 (Pa. Super. 2015), the plaintiff lost a judgment it had already won at trial because it had never registered in Pennsylvania.
None of this scales gently. Ten subsidiaries registered in three states each leaves you with 30 registered agent appointments and 30 filings on dates that don't align. You usually find out one slipped when a bank asks for a certificate of good standing mid-financing and the state lists that subsidiary as delinquent. That is how missed annual reports across multiple states tend to surface.
How to keep the liability shield intact
Run each entity as a real business with its own money and its own paperwork. Most people assume the shield is automatic, and it isn't. Courts pierce the veil when an LLC operates as an extension of its owner instead of a separate business with its own finances and records.
This is the half of the structure no filing platform can do for you.
How courts decide whether to disregard the structure
They ask whether you actually ran the entities as separate businesses. The test has a name, the alter ego doctrine, and it now applies to LLCs as it long has to corporations. Its details vary a great deal from state to state.
The common version asks two questions. Were the entity and its owner so intertwined that they stopped being separate? And was the entity used to commit a fraud or produce an unfair result? Courts weigh several factors, and no single one decides it.
Texas sets a higher bar. Its statutory veil-piercing standard requires actual fraud for the member's direct personal benefit, under Tex. Bus. Orgs. Code § 21.223(b) applied to LLCs through § 101.002.
Underfunding alone is enough in a minority of states. Under California law, inadequate capitalization of a subsidiary can by itself support holding the parent liable (Slottow v. American Casualty Co., 10 F.3d 1355 (9th Cir. 1993)).
Practices that keep the entities separate
The practices that matter are ordinary record-keeping done consistently. This is the paper trail you'd want if someone asked a court to disregard the structure.
Keep a separate bank account and a separate set of books for each entity, and pay each entity's bills from its own funds.
Put intercompany services and loans in writing, at market rates. Transfers with no promissory note, maturity date, interest rate or security get re-tested as debt versus equity, whatever the tax returns called them. See Estate of Fry, T.C. Memo. 2024-8, a memorandum opinion.
Sign contracts in the entity's full legal name, including the LLC designation, with the signer's title in the signature block.
Fund each subsidiary against foreseeable liabilities, and keep its state filings, taxes, and registered agent current everywhere it's registered.
One more thing about geography. Your separateness has to hold up wherever a subsidiary might face a claim, not just where it was formed. State courts often apply their own law no matter where the entities were organized.
Automate your parent-subsidiary compliance with Discern
You now have two jobs running in parallel. The separateness discipline stays with you and your counsel, because no platform decides how you run your entities. The filing layer underneath it is different work, repetitive and dated and identical at every entity. Discern manages that Secretary of State layer from a single platform. It covers registered agent service in all 51 jurisdictions, automatic annual report filings, and one-click foreign registrations with Discern. Delaware franchise tax is filed for you, and franchise taxes everywhere else are tracked with notifications.
That matters more the longer the chart gets. Every entity, deadline, and jurisdiction sits in one place, with due dates tracked automatically and autofilings running in perpetuity without manual input. Customers with 200+ registrations spend 5 to 10 minutes annually on compliance. The next subsidiary you add lands on the same calendar as the ones you already hold.
Book a demo with Discern to see how the platform handles your entire entity structure.
This article provides general compliance information and does not constitute legal advice. Consult qualified legal counsel for guidance specific to your situation.
Frequently asked questions about parent-subsidiary LLC structures
Most of these turn on one thing, which is whether each entity is genuinely operated on its own.
Can an LLC own another LLC?
Yes. Most state LLC acts place no restriction on who can be a member, so an LLC can be the sole member of another LLC. Your holding company owns the stakes, and each subsidiary keeps its own formation filing, registered agent, and state obligations.
Does every subsidiary LLC need its own EIN?
Not necessarily. A single-member subsidiary with no employees and no excise taxes to pay can use its owner's name and taxpayer identification number for federal tax purposes. It needs its own employer identification number once it pays wages, and your bank or a state tax office may ask for one sooner.
How is a single-member subsidiary taxed?
The IRS ignores it for income tax purposes by default, so its activity appears on the owner's return. It stays a separate entity for employment tax and certain excise taxes, which is why a subsidiary with employees files those returns under its own name.
When does a subsidiary need foreign registration?
When it operates outside its formation state. An office, employees, or income-producing property in another state generally triggers registration there and a registered agent appointment. Standards differ by state, so rely on qualified counsel and current state guidance before you treat a subsidiary as exempt.
Does the holding company have to register in every state where its subsidiaries operate?
Usually not. Owning and controlling a subsidiary is excluded from the "transacting business" definition in a number of states, including Florida. Those exclusions are narrow and worded differently in each state, and New Mexico's reaches only a controlling interest in a corporation. If the holding company itself holds property, signs leases, or employs people in a state, that's a separate question.
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