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Editorial 7 MIN READ

One EIN or many: the holding-company question founders ask too late

How the IRS treats a parent, its subsidiaries, and the disregarded SMLLC that sits between them

The Editors
Staff, Incorporator.org
7 min read Updated
Contents 7 sections
  1. Each entity gets its own EIN, as a default
  2. The disregarded-SMLLC exception, read carefully
  3. Employment tax is the trap, and it was closed in 2009
  4. What changes when the parent is a C-corp with subsidiaries
  5. State accounts are not federal EINs
  6. Rule of thumb
  7. Sources

very legally distinct entity in a holding-company structure gets its own EIN, with one narrow federal-income-tax exception for a disregarded single-member LLC. That is the whole rule, and the rest of this piece is the texture around it.

The question usually arrives after the legal work is done. A founder has a parent LLC, two operating subs, and a real-estate SMLLC, and the bank wants a W-9 for each of them. The right EIN strategy for a holding company depends on how each entity files, whether it has employees, and whether the lender, the state, or a counterparty needs to see a separate taxpayer identifier.

Each entity gets its own EIN, as a default

The starting rule is simple. Every separately organized business entity is a separate taxpayer for most purposes, and the IRS issues each one its own Employer Identification Number on Form SS-4. A parent LLC and each of its subsidiaries are separate filers on the state rolls, hold separate bank accounts, sign separate contracts, and carry separate liability. They get separate EINs.

The administrative friction of this is small if you do it in the right order. When the responsible party signing Form SS-4 has a U.S. Social Security Number or ITIN, the online EIN application at irs.gov issues a number at the end of the session and mails the CP 575 confirmation letter in roughly four to five business days. When the responsible party is foreign and has no SSN or ITIN, the online tool is closed to them and the applicant files Form SS-4 by fax or mail; the IRS currently quotes four to six weeks for those responses, and in busy periods it runs longer. For a holding-company build with a non-U.S. founder, the EIN queue is often the slowest gating item, and starting the SS-4 stack before the bank conversation saves a month.

The responsible party on each SS-4 is a natural person with actual control of the entity. For a parent-over-subs structure, it is fine (and common) to list the same human as responsible party on each subsidiary's SS-4, because that person does in fact control each one through the parent. The IRS is not asking who owns the entity on paper; it is asking who can direct its assets.

The disregarded-SMLLC exception, read carefully

The one place a founder has a real choice is the disregarded single-member LLC. Under Treas. Reg. §301.7701-3, an SMLLC defaults to disregarded-entity status for federal income tax, meaning its income, deductions, and credits are reported on the owner's return rather than on a separate 1065 or 1120. And under Treas. Reg. §301.6109-1(a)(2), a disregarded SMLLC is not required to obtain its own EIN for that federal-income-tax reporting; the owner's EIN (or SSN, for an individual owner) suffices.

That regulation is the source of a genuine menu item. A disregarded SMLLC can either obtain its own EIN or use the parent's EIN on federal income-tax documents tied to disregarded status.

In practice almost every SMLLC obtains its own EIN anyway, for reasons that sit outside the federal-income-tax question:

Banks and brokerages will not open an account for a legally distinct LLC without a distinct EIN on the account-opening file. A W-9 for "Parent LLC" does not match the account titled "Subsidiary LLC," and the compliance desk rejects it. The bank is not reading the Treasury regulation; it is reading its own KYC form.

States issue their own employer, sales-tax, and withholding accounts by entity, and they expect a federal EIN on the registration. A state sales-tax registration for the SMLLC will typically require a federal EIN in the SMLLC's name.

Counterparties (landlords, vendors, large customers) send 1099s and W-9 requests to the entity that signed the contract. If the SMLLC signed, the counterparty wants an EIN for the SMLLC.

So the honest framing is this. The disregarded SMLLC has an option under §301.6109-1(a)(2) to use the parent's EIN for federal income tax, and no option at all to share an EIN with the parent for banking, state tax accounts, or counterparty reporting. Most holding-company builds simply get the SMLLC its own EIN on day one, because the operational need arrives within weeks.

Employment tax is the trap, and it was closed in 2009

The one hard line in the SMLLC story is employment tax. Before 2007, some advisers put payroll for a disregarded SMLLC onto the owner's EIN; the IRS and Treasury closed that route in a rulemaking finalized as TD 9356, codified at Treas. Reg. §301.7701-2(c)(2)(iv)(B). The regulation treats a disregarded entity as a separate entity for federal employment-tax purposes, effective for wages paid on or after January 1, 2009.

What that means operationally: if a disregarded SMLLC has employees, the SMLLC (not its owner) is the employer of record for Form 941, Form 940, W-2s, and the federal deposit schedule, and it must have its own EIN to run payroll under. There is no "we'll use the parent's EIN" shortcut for employment tax. Any holding-company structure with payroll at the sub level needs an EIN at the sub level.

The same regulation, at §301.7701-2(c)(2)(v), treats the disregarded entity as separate for certain federal excise taxes as well, on a similar theory: the IRS wants one identifier per employer and one per excise-tax filer, regardless of the income-tax disregard.

What changes when the parent is a C-corp with subsidiaries

Consolidated-group mechanics work on a different axis. Under IRC §§ 1501 through 1504, an affiliated group of corporations meeting the 80% vote-and-value test can elect to file a consolidated federal income-tax return. In a consolidated return the common parent files one Form 1120 that aggregates the group's income, and it files under the parent's EIN.

That sounds like the sort of setup where subsidiaries might not need EINs. They do. Each subsidiary in a consolidated group keeps its own EIN, for the same reasons the SMLLC does: state income-tax and franchise-tax filings are per entity, employment-tax filings are per entity, information returns run per entity. The consolidated election is about where the taxable income lands for federal 1120 purposes, not about collapsing the group into a single taxpayer for every other purpose. Each sub still signs Form 1122 (consent to be included), and each sub still has its own EIN on file.

For a private-equity-style holding-company build where the parent is a C-corp and the subs are operating C-corps, the practical workflow is: form each entity, obtain an EIN for each, have the parent file Form 1122 with each sub's consent, and file one consolidated 1120 under the parent's EIN once the affiliation test is met.

For a holding-company LLC owning operating subsidiaries that are separately taxed (partnership LLCs or C-corp subs electing their own treatment), there is no consolidated-return option at the federal level because the parent is not a corporation. Each entity files its own return under its own EIN, and the parent's K-1s or dividends move the economics up the chain.

State accounts are not federal EINs

Founders sometimes assume the federal EIN "is" the state tax account, and it is not. Every state with income-tax withholding and every state with unemployment insurance issues its own account numbers on its own schedules, and registration is per entity per state. A Delaware parent with operating subs in California and Texas will end up with:

A federal EIN for the parent and one for each sub (four EINs for a parent and three subs). California Employment Development Department accounts for any sub with California payroll (one EDD employer account for state payroll withholding, same form, and a separate UI account issued at the same time). Texas Workforce Commission UI accounts for any sub with Texas payroll. Franchise-tax or corporation-tax accounts in each state where the sub files. Sales-tax permits in each state where the sub has nexus.

None of those state accounts can share across siblings, and none can use the parent's federal EIN as a substitute for a state account number. The state registrations are downstream of having the right federal EINs in place, not a replacement for them.

There is one small planning point inside this. A state's unemployment account and its withholding account are issued by different agencies in many states (labor department for UI, revenue department for withholding), and the two systems do not cross-walk. A founder who receives the state UI number and assumes payroll is ready will discover mid-quarter that the withholding account is still pending and the first paycheck landed without a state deposit. Register both at the same time.

Rule of thumb

Give every legally distinct entity its own EIN on day one, and treat the SMLLC's federal-income-tax exception as a technicality, not a strategy.

Sources

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