One LLC per property, a series LLC, or one LLC for everything?

Once you own more than one rental, the same question shows up at every closing: do you put this property in its own LLC, fold it into the one you already have, or set up a series LLC and run everything under a single umbrella entity? The asset-protection attorneys who own this search result have a clear preferred answer, and it tends to be the one that bills the most formation packages. This page has no entity to sell. It lays out what each structure actually costs at 2, 5, and 10 doors, the record-keeping burden each one creates, and the honest tradeoff a small landlord is really choosing between.

The thing nobody selling LLCs leads with: the protection any of these structures promises depends almost entirely on whether you keep each entity's money and records truly separate. A perfectly drafted three-LLC structure with commingled bank accounts and one shared spreadsheet is a structure a plaintiff's lawyer can pierce. A single LLC with clean, per-property books and a real operating account holds up far better than its paperwork suggests. Entity count is the decision everyone debates; the discipline behind it is the part that decides whether the shield works.

The three structures, plainly

There are really three options, and they differ on how many filings you maintain and how isolated each property is when something goes wrong.

• One LLC for everything. Every property sits inside a single entity. Cheapest and simplest to run: one filing, one bank account, one tax treatment. The weakness is that all the equity lives in one liability pool, so a judgment at one property can reach the others.
• One LLC per property. Each property gets its own entity, so a lawsuit at one is walled off from the rest. The strongest isolation and the heaviest overhead: every property is a separate filing, a separate bank account, and a separate set of books to keep clean.
• A series LLC. A single parent entity that spins up internal series, each meant to hold one property and shield it from the others, typically under one state filing. The pitch is per-property isolation at close to single-entity cost. The catch is that availability and legal recognition vary by state.

For the basic case of whether to form an LLC at all, and how it stacks up against carrying more insurance instead, start with the LLC for a rental property guide. This page assumes you have already decided an entity makes sense and are choosing how to arrange more than one.

The cost math at 2, 5, and 10 doors

Entity cost is two numbers: a one-time formation cost and a recurring annual cost. Formation runs roughly $50 to $500 per LLC depending on your state and whether you use an attorney or a filing service. The recurring side is what compounds: many states charge an annual report fee or franchise tax, often in the $0 to $800 per entity range, and a few states sit at the high end of that. Multiply the recurring number by how many entities you run and the picture gets clear fast.

Say your state charges $150 to form an LLC and $100 a year to keep it alive. At 2 properties, one LLC per property means $300 to set up and $200 a year forever; one combined LLC is $150 and $100 a year. The gap is small, which is why doubling your filings for two low-equity doors rarely pays. At 5 properties, separate LLCs run $750 up front and $500 a year against $150 and $100 for a single entity, a $400 annual premium for isolation. At 10 properties, you are looking at $1,500 to form and $1,000 a year in recurring fees for the per-property route, plus the bookkeeping time, versus $100 a year for one entity that pools all the risk.

A series LLC aims to collapse that recurring number back toward a single filing while keeping the per-property separation, which is its whole appeal at 5 and 10 doors. Whether it delivers depends on your state and on where a future lawsuit lands, which is the next section. Run your own state's numbers before you commit, because the annual fee, not the formation cost, is what you pay every year for the life of the portfolio.

Series LLCs: cheaper on paper, uncertain in court

A series LLC is appealing because it promises one-entity cost with many-entity protection. The problem is geographic. Only some states authorize series LLCs at all, and the internal liability shields between series are newer law than the ordinary LLC shield, with far less courtroom history behind them. Legal commentators have flagged the core risk repeatedly: if a tenant or visitor sues in a state that does not recognize series LLCs, a court there may decline to respect the internal separation and treat the whole series as one pool. Your isolation can depend on where the slip-and-fall happens, not on how you filed.

The record-keeping burden is the real cost

Filing fees are the cost everyone compares. The cost that actually decides whether the structure protects you is bookkeeping. Asset protection rests on a principle the courts apply across all three structures: each entity, or each series, has to look and operate like a genuinely separate business. That means a dedicated bank account per entity, no paying personal expenses out of the entity, no shuffling rent between properties without documenting it, and a clean separate ledger for each one. Commingle the money and a plaintiff's attorney will argue the entities are a sham, and the shield you paid for evaporates.

The same logic applies to security deposits, which courts and many state statutes already expect you to keep separate and accounted for per tenant; the separate-account and commingling rules for deposits are the deposit-level version of the same separation principle that keeps an entity shield intact. Three LLCs with one comingled checking account is weaker than one LLC with disciplined per-property books, which is the uncomfortable point the formation packages skip.

This is why entity count alone is the wrong thing to obsess over. The burden scales with how many separate sets of books you have to keep honest, and most small landlords underestimate that ongoing work when they are excited about protection at the closing table. If you are weighing structures while building toward more doors, the rental property portfolio guide covers how the protective layers fit together as you scale.

Mortgages, taxes, and the practical snags

Two practical issues catch landlords mid-transfer. The first is the due-on-sale clause: moving a mortgaged property into an LLC can technically give the lender the right to call the loan, a risk worth understanding before you deed anything, and one the due-on-sale clause guide walks through in detail. The second is taxes. A single-member LLC is usually disregarded for federal tax, so the rental still flows onto your Schedule E either way, but the IRS treatment of series LLCs has been governed by proposed regulations rather than settled rules, so series tax handling is an area where you genuinely want a CPA before you file.

None of these snags is a reason to avoid an entity. They are reasons to decide deliberately rather than copy a YouTube attorney's template, and to keep the structure simple enough that you can run it for years without making a mistake that undoes the protection.

The honest recommendation for 1 to 10 doors

For a small portfolio, the sequence that protects the most for the least effort usually looks like this: carry adequate landlord insurance, add an umbrella policy to extend your liability limits cheaply, and only then layer in entities for the equity that exceeds what insurance will reasonably cover. Whether the entity layer should be one LLC, several, or a series depends on your equity, your state's annual fees, and how disciplined your books are. The umbrella insurance versus LLC comparison covers that first line of defense, and the cash-on-cash calculator tells you how much equity each property is actually carrying, which is the number that decides whether more entities are worth it.

Whatever structure you land on, the protection lives or dies on keeping each entity's records genuinely separate, and that is the cheap, unglamorous part most landlords let slide. This is where rents.ai is the low-cost version of the hygiene every attorney says the structure depends on: per-property ledgers, separate deposit tracking, and per-property document folders, so each property reads as its own business at tax time and in a deposition. It will not form your LLCs, file your annual reports, or give you legal advice, and you still need a local attorney for the entity itself; what it does is keep the books clean enough that the entity you do form actually holds. The structure is the easy part to buy. Running it like real separate businesses, year after year, is the part that actually protects you.