Multi-Entity Structures: HoldCo, OpCo, and Series LLC

Run two businesses out of one entity and a slip-and-fall in the second one reaches the first one’s bank account. That is the whole argument for what follows. An owner with multiple business lines, significant real estate, or substantial passive investments separates operations from assets and stacks ownership through a holding entity — not for sophistication, but because a single entity puts everything you own behind one liability wall and dares a plaintiff to breach it.

HoldCo / OpCo. A holding company (typically an LLC taxed as a partnership, or an S-corporation for one or two owners) owns the equity of one or more operating subsidiaries. Each operating subsidiary is its own entity — typically an LLC, possibly with its own S-corporation election — and bears the operational liability for that business line. The HoldCo collects distributions from each OpCo, retains working capital, and acts as the family-level investment vehicle. You buy three things with the extra filings. A lawsuit against one OpCo does not reach the others or the cash sitting at the HoldCo. The K-1s consolidate upward, so you get one owner-facing return instead of five. And the estate plan has something clean to attach to: what gets gifted to a trust is the HoldCo interest, not multiple operating entity stakes requiring separate valuations. If you have more than one real business, build it this way from the start — retrofitting a holding structure onto entities that already hold appreciated assets is where the tax bill lives.

PropCo and the real-estate separation. Do not hold real estate in the entity that operates the business. The conventional structure is a separate LLC — the PropCo — owning each property and leasing it to the OpCo at arm’s-length rent, which the OpCo deducts as an operating expense while the PropCo collects the rent, depreciates the building, and pays tax on what is left. Two payoffs. The building is out of reach of anything the operating business does to attract a lawsuit. And when you sell, you sell the business without selling the real estate — which, for most small businesses that own their premises, is the more valuable asset and the one you want to keep collecting rent on after the buyer takes over. With multiple properties, one LLC per property represents standard best practice, not an exotic exception, even inside a single state. One tax rule governs the rent whether or not you planned for it: under the self-rental recharacterization rule of Treas. Reg. §1.469-2(f)(6), net rental income from a property leased to a business you materially participate in is non-passive — it cannot absorb passive losses — while a net rental loss on the same property stays passive. The asymmetry, and the grouping election that partially defuses it, are covered in section “Self-Rental Structuring”.

The QBI seam between OpCo and PropCo. Two IRC §199A regulations decide whether the rent the PropCo collects gets the 20% deduction, and the answer turns on what the OpCo does. If the operating business is a specified service trade — a medical, legal, accounting, or consulting practice — Treas. Reg. §1.199A-5(c)(2) treats the portion of any commonly controlled business that provides property or services to it as an SSTB itself, common control meaning 50% or more overlapping ownership. The physician’s building earns SSTB rent, and above the income ceiling (section “The Qualified Business Income Deduction”) it gets the same zero the practice gets. Nothing in the leasing structure changes that; only selling the building to an unrelated landlord does. If the operating business is not an SSTB, the seam runs the other way and helps you: Treas. Reg. §1.199A-1(b)(14) treats a rental to a commonly controlled business as a trade or business for §199A without any hours test, and the Treas. Reg. §1.199A-4 aggregation election lets you combine the OpCo and the PropCo (or several OpCos) into one computation — the same owners holding 50% or more of each, the same tax year, none of them an SSTB, and two of three connective facts: the same products or services, shared facilities or back office, or operation in coordination. The payoff is that the OpCo’s W-2 wages support the deduction on the PropCo’s rent, which otherwise has no wages and, on a fully depreciated building, little UBIA. Make the election on the first return that needs it; once made, it binds every later year unless the facts change.

Series LLC. About fifteen states (Delaware, Texas, Illinois, Nevada, and others) permit the Series LLC: a single LLC at the state level that internally creates separate “series” or “cells”, each with its own assets, members, and operational scope, and each shielded from the liabilities of the other series. For an owner with many small entities — a landlord with twenty rental properties, an investor in multiple syndications — the Series LLC reduces filing fees and administrative overhead compared with twenty separate LLCs. Federal tax treatment of series remains unresolved in key areas, and states that do not authorize Series LLCs often refuse to respect inter-series liability partitions when a defendant is sued in that jurisdiction. For a portfolio held entirely within series-friendly states, the structure is sound; for a portfolio that crosses state lines, separate LLCs per property are the safer architecture.

A note on entities for investments. A common but usually wrong instinct is to form an LLC to hold a passive securities portfolio. For ordinary stock and bond holdings, the LLC adds an annual filing and, in some states, a franchise tax, while delivering no liability or creditor-protection benefit beyond what state homestead and exempt-asset statutes already provide. Form an LLC for an investment vehicle only if it serves a specific purpose: pooling capital across multiple owners, restricting transferability of interests for estate-planning discounts (the family limited partnership discussed in section “Estate planning”), or holding investments that carry their own liability (working-interest oil and gas, real-estate syndications). For a single-owner securities portfolio, the LLC is tax-inefficient with no offsetting benefit.