The short answer
Yes. The IRS's proposed regulations on series LLCs, published in September 2010 and still not finalized, would treat each series as an entity formed under local law and classify it on its own, so a series owned by one person is disregarded into that person and a series with two or more owners is a partnership. The taxpayer for the exchange is whoever the owning series is for tax purposes, and the replacement must go into that same series or to its owner. Moving the deal into a different series or into the parent LLC can break the same-taxpayer requirement if the ownership differs.
At a glance
| Federal guidance | Proposed regulations from September 14, 2010, never finalized |
|---|---|
| Proposed treatment | Each series is an entity formed under local law |
| One owner series | Disregarded, so its owner is the taxpayer |
| Multi-owner series | Partnership by default, so the series is the taxpayer |
| Replacement buyer | The same series that sold, or its sole owner |
| State law | Recognition and the power to hold title differ by state |
| Effective date if finalized | Taxable years after final regulations are published |
Proposed regulations treat each series as its own entity
A series LLC is one company whose agreement creates separate series with their own assets, members and liability shields. Under the Delaware statute, debts of a properly established series 'shall be enforceable against the assets of such series only', and a protected or registered series has the power to 'hold title to assets (including real, personal and intangible property)' in its own name.
The federal question is whether each series is a separate taxpayer. The IRS and Treasury answered it in proposed regulations published on September 14, 2010 (REG-119921-09): a domestic series 'is treated as an entity formed under local law', and its classification is then decided under the ordinary entity rules.
Those regulations are still proposed. By their terms they would apply to taxable years beginning after final regulations are published, so they describe the IRS's stated position rather than binding law. Most practitioners follow them because no other federal guidance exists.
Whoever owns the selling series is the exchanger
Once a series is an entity, the default rules in Reg. Section 301.7701-3(b)(1) apply to it: a partnership if it has two or more members, disregarded if it has a single owner. A series owned only by you is invisible for income tax purposes, and you are the taxpayer.
A series owned by you and a business partner is a partnership, and the series itself is the taxpayer that sells, exchanges and files a return. A series that elected corporate status is a corporation. The parent LLC is not the taxpayer for a series' property under this approach.
That means the exchange agreement, the assignment of the sale contract and the identification notice should name the series that owns the property, and the replacement should be acquired by that series or, if it is disregarded, by the same owner.
Replacing into a different series works only when the owner is the same
Investors often want the replacement in a new series for liability reasons. If both the old and the new series are disregarded into you, both are you for tax purposes and the move is generally treated like any disregarded LLC to disregarded LLC exchange.
If the selling series is a partnership and the new series is owned differently, the buyer is a different taxpayer and the exchange can fail. The same problem arises if the replacement is titled in the parent LLC, which may be classified differently from the series.
State law can add a second problem. Not every state recognizes series formed elsewhere, and in some the series cannot hold title in its own name, so the deed may have to go to the parent LLC 'for the benefit of' the series. Your title insurer and lender will decide what they will accept.
Worked example: one series sells, another buys
Hypothetical, round numbers; run your own numbers with your CPA. A Delaware series LLC has Series A, owned 100% by you, holding a fourplex worth $1,000,000, and Series B, owned 50/50 by you and your brother, holding a warehouse.
Series A sells the fourplex. If you form Series C, also owned 100% by you, and it buys a $1,100,000 replacement, both A and C are disregarded into you and the same taxpayer sold and bought. If Series B buys the replacement instead, the buyer is a partnership with your brother in it, and the exchange fails.
If Series A is moved into the 50/50 ownership the week before closing, it becomes a partnership and the exchanger changes. Keep the ownership of the selling series unchanged until the replacement closes.
- Series A sells, Series C buys, both 100% yours: same taxpayer.
- Series A sells, Series B buys: different taxpayer, exchange fails.
- Series A sells, parent LLC buys: depends on how the parent is classified.
Paper the series before you sell, and consider a simpler replacement
Ask your attorney for the series' formation documents and confirm the series is properly established under the state statute, with separate records. Give the intermediary the series' exact name and the tax ID that goes with its classification; which tax ID goes on the exchange documents explains that choice for disregarded entities.
Some owners use the sale to leave the series structure. A Delaware Statutory Trust interest can be bought by the same taxpayer that sold, and the trust carries its own liability separation at the property level. Whether a DST offering accepts a series as a subscriber is an offering-by-offering question.
For more on entity changes around an exchange, see moving from your personal name into an LLC and two LLCs selling and buying one replacement.
Related questions
Is a series LLC a single taxpayer for federal purposes?
Under the 2010 proposed regulations, no. Each series is treated as its own entity and classified separately. The regulations are not final, so confirm the approach with your CPA.
Does each series need its own EIN?
A series disregarded into an individual generally uses the owner's number for income tax. A series classified as a partnership or corporation needs its own EIN for its return.
Can the parent LLC hold title for a series?
Some state statutes and title insurers expect the parent to hold title for the benefit of a series. If you do that, make sure the exchange documents and the deed describe the same owner for tax purposes.
What if my state does not recognize series LLCs?
A series formed elsewhere may not be respected in a state that lacks a series statute, which affects title and liability more than federal tax. Ask your attorney before using a series for out-of-state property.
Can I combine two series' properties into one replacement?
If both series are disregarded into you, the sales are yours and can fund one replacement. If either series is a partnership, that series is a separate taxpayer and needs its own exchange.
Sources
Checked against these publications on September 30, 2026. Rules and figures change; confirm the current version with your CPA or attorney before you act. This page is general information, not tax or legal advice.
- Series LLCs and Cell Companies, proposed rule, 75 Fed. Reg. 55699 (Sept. 14, 2010), REG-119921-09
- 6 Del. C. 18-215 and 18-218, series of a limited liability company
- 26 CFR 301.7701-3, classification of eligible entities (Cornell LII)
- 26 CFR 301.6109-1, identifying numbers (Cornell LII)
- 26 U.S.C. 1031 (Cornell LII)