Series LLC vs Multiple LLCs: The Real Cost Comparison

Is a series LLC cheaper than multiple LLCs?

At the state level, yes, and the gap widens with each additional asset. At the federal level there is no saving at all, because both structures need the same number of EINs and file the same returns.

State formation is where the saving is real. A series LLC is 1 registration regardless of how many series it holds. 5 separate LLCs means 5 registrations, 5 registered agent relationships, and 5 annual reports. In a state charging $300 to form, that is $300 against $1,500 on day 1.

The federal side is flat between the 2 structures. An EIN costs $0 whether it belongs to a standalone LLC or a series, and the number of EINs required is decided by the 4 filing triggers, which do not care about the wrapper. A structure with 5 genuinely separate businesses needs 5 numbers either way.

The filing load is likewise identical where activity is identical. 5 businesses each running payroll file 20 Forms 941 a year in either structure. The series wrapper reduces state registrations, not federal returns.

Where the series structure adds cost is in bookkeeping discipline and in legal uncertainty. Separate records per series are what the liability wall depends on, and that is an ongoing operational cost that 5 separate LLCs get for free by existing separately.

What does each structure cost to form?

1 state filing against several. A 5-asset owner pays 1 formation fee with a series LLC and 5 with separate LLCs, plus 1 registered agent relationship against 5. In Texas that is $300 against $1,500.

Formation fees vary widely by state, and the multiplier does not. Texas charges $300 to form an LLC, Delaware $90, Wyoming $100, California $70. Whatever the number, the separate-LLC route pays it once per asset and the series route pays it once in total.

Registered agent cost multiplies the same way. A commercial registered agent runs roughly $99 to $200 a year per entity. 5 separate LLCs carry 5 of those relationships; a series LLC carries 1 for the master, because the series are not separately registered entities in most states.

Delaware and Illinois are the partial exceptions, and they narrow the gap. A Delaware registered series carries its own annual state amount, and an Illinois certificate of designation carries a per-series fee. In those 2 states the series route still wins on formation, by less.

Nothing in the formation comparison touches the EIN. Both structures pay the IRS $0, in year 1 and every year after, on however many numbers they end up holding.

What does each structure cost every year?

Separate LLCs pay per-entity annual fees, annual reports and registered agent renewals. A series LLC pays 1 set for the master, plus a per-series amount in Delaware and Illinois only.

Annual state fees are the recurring half of the saving, and they compound. Wyoming charges an annual report fee of $60 per LLC. Delaware charges an annual LLC franchise tax of $300. California charges a minimum franchise tax of $800. Multiply any of those by 5 and the series route looks strong.

The recurring federal cost is $0 in both structures. An EIN never renews, and no service that charges an annual amount to maintain a taxpayer identification number is charging for anything the IRS does.

Bookkeeping is where the series structure claws cost back. Each series needs its own books, its own asset records, and ideally its own bank account, because commingling is what a creditor attacks when testing the liability wall. Separate LLCs enforce that discipline structurally; a series LLC depends on the owner to enforce it.

Professional fees track complexity rather than entity count. An accountant preparing 1 return covering 5 series inside a master charges less than 5 returns. An accountant untangling 5 series that shared 1 bank account charges considerably more than either.

Source: state fee schedules for Texas, Delaware, Wyoming and California, and the IRS Instructions for Form SS-4, verified August 2026. State fees change; confirm current amounts with the Secretary of State before relying on them.

Does either structure need fewer EINs?

No. The count is identical, because the IRS applies the same 4 triggers to both. A series that pays wages needs its own number for the same reason a standalone LLC that pays wages does.

This is the point most comparisons get wrong. A series LLC is sold as 1 entity, and owners infer 1 EIN. What actually decides the number is whether a given business unit files an employment tax return, an excise tax return, its own income tax return, or opens a bank account in its own name.

Run it against a worked case. 5 rental properties, each with its own lease, its own bank account and its own bookkeeping, need 5 EINs plus the master's in a series LLC, and 5 EINs as 5 separate LLCs. The series route holds 6 numbers to the separate route's 5, because the master itself is an entity that also needs one.

Now change the facts. 5 rental properties banking into 1 account and reporting on 1 return need 1 EIN in a series LLC and 5 as separate LLCs, because 5 separate LLCs are 5 separate entities whether or not they trade. That is the case where the series structure genuinely reduces the federal count.

So the honest rule is that a series LLC reduces the EIN count only when it also reduces the number of separately-operating businesses. Wrapping 5 genuinely separate operations in 1 registration changes the state paperwork and leaves the federal paperwork where it was.

Which structure protects assets more reliably?

Separate LLCs, on current case law. Each is a distinct legal person with decades of precedent. A series wall rests on newer statutes with thin litigation history, and on the owner maintaining separate records.

The separate-LLC shield is the one courts have tested most. Piercing analysis for a standalone LLC is well developed, and an owner who keeps separate books and does not commingle funds knows roughly where they stand.

The series shield is younger. Most series statutes date from the 2000s and 2010s, and reported decisions testing whether one series' creditor can reach another series' assets are few, especially across state lines. A court in a state with no series statute has no obvious framework for respecting one created elsewhere.

Bankruptcy adds a further open question. Whether an individual series can file as a debtor separately from the master, and whether a master's filing sweeps in its series, has no settled answer. That uncertainty is priced into the structure whether or not the owner notices it.

None of this makes the series structure wrong. It makes it a trade of certainty for cost, and the trade is more attractive as the number of low-risk assets rises and less attractive as the value at risk in any 1 series rises.

At what point does a series LLC pay for itself?

When the recurring state cost of the entities it replaces exceeds the cost of the extra bookkeeping discipline it demands. In a high-fee state that is 2 or 3 assets; in a low-fee state it can be 6 or more.

Run the arithmetic in the formation state rather than in the abstract. In California, where the minimum franchise tax is $800 per LLC per year, replacing 3 LLCs with 3 series saves $1,600 a year before any formation saving, and the crossover arrives almost immediately.

In Wyoming, where the annual report fee is $60, replacing 3 LLCs with 3 series saves $120 a year. That saving is smaller than the cost of an accountant untangling 1 commingled series, so the crossover sits much further out.

Delaware sits in between, and its registered series fee narrows the gap deliberately. The state built a per-series charge into the structure, which is a reasonable proxy for how much of the saving the state considers real.

Whatever the state, the federal column of the comparison stays $0 in both structures. Anyone selling a series LLC on federal tax savings is selling something the Internal Revenue Code does not contain.

Can you convert between the 2 structures later?

Yes, and both directions have tax consequences. Moving assets out of a series into a new standalone LLC is a transfer, and Rev. Rul. 99-5 and 99-6 govern what happens when member counts change in the process.

Splitting a series out into its own LLC is an asset transfer, not a re-labelling. Basis, holding period and any debt attached to the asset all follow the transaction, and a transfer into an entity with different ownership can be a taxable event.

Consolidating separate LLCs into one series LLC raises the same issues in reverse, and adds a practical one: each dissolving LLC has an EIN with a filing history behind it, and final returns are due for each. The EINs are not reused by the surviving structure.

Rev. Rul. 99-5 and Rev. Rul. 99-6 are the load-bearing authorities whenever member count changes during a restructure. A 1-member entity that admits a member becomes a partnership and takes a new EIN; a partnership that consolidates to 1 owner becomes disregarded.

Because both directions cost money and neither changes the federal EIN logic, the structure decision is worth getting right at formation. The detail on when a restructure forces a new number sits on the new EIN for an LLC page.

Who should pay anyone to file this?

An applicant holding an SSN or ITIN pays nobody. The IRS online assistant issues each EIN in about 15 minutes for $0. An applicant without either uses the fax route, also $0, or hands it to someone.

Price context, so the $97 is legible. The IRS charges $0 for the EIN itself and it never renews, so year 2 and every year after costs $0. Formation companies price it as an add-on: Northwest at $200 without an SSN, ZenBusiness at $99, Rocket Lawyer at $59.99, all verified July 2026. None of the 3 publishes a written filing deadline, and none reviews the SS-4 classification lines before filing. Full breakdown on LLC EIN cost.

What else do owners ask when choosing between the 2?

8 questions come up most: which is cheaper, whether the EIN count differs, where the saving comes from, which protects assets better, and whether a structure can be converted later.