Most rental investors use LLCs for one or both of two reasons: liability separation and tax flexibility.

Liability separation: if a tenant sues over an injury at the property, the lawsuit targets the LLC that owns the property, not you personally. Your personal home, personal bank accounts, and other properties owned by other LLCs are insulated. The LLC has to be properly maintained (separate bank accounts, no commingling, real operating agreement) for this protection to hold up in court.

Tax flexibility: a single-member LLC is a "disregarded entity" for federal tax purposes, meaning all income flows to your personal return on Schedule E. A multi-member LLC defaults to partnership taxation (Form 1065 + K-1s). LLCs can elect S-corp or C-corp treatment if it fits the situation. Single-member LLCs are the simplest and almost always the right starting point for rental investors.

There are reasons not to use an LLC: most state DSCR programs accept either, but personal vesting can sometimes get marginally better rates. Single-family rentals held casually for a few years may not justify the LLC overhead.

The single-member LLC ("SMLLC") is the default structure for solo rental investors. It is a disregarded entity for federal taxes (you report rental income on your personal Schedule E), a separate legal entity for liability, and accepts DSCR financing without issue.

Setup is straightforward in most states: file articles of organization with the Secretary of State ($50-$300 depending on state), create an operating agreement, get an EIN from the IRS (free, takes 10 minutes online), and open a dedicated bank account for the LLC.

For DSCR financing, an SMLLC borrows in its own name with the member as personal guarantor. The personal guarantee is non-negotiable on virtually all DSCR programs — without it the rate would be far higher (commercial pricing) or unavailable. The personal guarantee does not erase the liability separation; it simply means the lender can pursue you personally if the loan defaults.

Once you own multiple properties, the question is: one LLC holding all of them, or one LLC per property?

One LLC per property: maximum liability separation. A lawsuit on Property A cannot reach Property B if they are in separate LLCs. Cost: more entities to maintain, more bank accounts, more filings, more accountant fees at year-end.

One LLC holding many properties: simpler administration, single set of books, one bank account. Downside: if Property A gets sued, all the properties in the LLC are at risk.

Common compromise: group properties by risk profile or geography. Two or three LLCs, each holding 3-5 properties. Big enough portfolios sometimes justify a single LLC per property but that is rare below 10 properties.

A series LLC (available in TX, DE, IL, NV, OK, TN, AL, IN, VA, others) lets you create separate "cells" inside a single master LLC, each with its own asset isolation, while still filing one master tax return. It is the structural compromise specifically designed for landlords who want one-per-property liability separation without one-per-property tax filings. Series LLCs are more administratively complex though, and not every state recognizes another state's series LLC, so the protection can be uncertain when a tenant sues in a non-recognizing state.

At 10+ properties, many investors evolve toward a two-tier structure: a holding LLC that owns membership interests in multiple operating LLCs, each of which owns properties.

The benefits: the holding LLC simplifies estate planning (one entity to transfer at death rather than 10+), centralizes ownership of the membership interests, and lets you create different tax classifications for the operating LLCs without rebuilding everything. The operating LLCs each provide liability separation at the property level.

For DSCR financing, the operating LLC is the borrower. The holding LLC is mentioned in the underwriting but is not typically a guarantor — the individual ultimate owner is. Some lenders want the operating agreement of the operating LLC to name the borrower-individual as a member directly (not just through the holding LLC) for the guarantee to be cleanly enforceable.

When you bring in a partner or co-investor, you have a multi-member LLC ("MMLLC"). MMLLCs default to partnership taxation: the LLC files Form 1065, each member gets a K-1, members report their share on Schedule E.

DSCR financing on an MMLLC is fine but requires personal guarantees from any member with 20%+ ownership (some programs go higher to 25%). All guarantors must qualify on their own credit. If one partner has a 580 FICO they will drag down the rate; some programs disqualify the loan entirely below their threshold.

Practical note: many partnerships find single-member LLCs (held individually by each partner, with a separate tenancy-in-common agreement on the property) cleaner than a single MMLLC, especially if partners want different tax outcomes (one wants to depreciate, the other wants cash distributions). Talk to your CPA — there are real trade-offs.

Some states are LLC-friendly (low fees, strong charging-order protection, no state income tax): Wyoming, Delaware, Nevada, Texas.

Other states are punitive: California charges an $800/year minimum franchise tax PER LLC, regardless of activity. If you own four properties in CA and use four LLCs, that's $3,200/year in franchise tax alone — many CA investors pick a different structure or absorb the cost.

The rule of thumb: form your LLC in the state where the property is located (foreign-LLC registration in that state is also fine but adds administrative overhead). The "form in Wyoming for asset protection" advice is overrated for working-class portfolios — your tenant suing in Florida is litigating in Florida court regardless of where your LLC was formed.