Direct answer: Your LLC needs an EIN if it has multiple owners, employees, relevant excise-tax duties, or a corporate election. A sole-owner LLC without those triggers may not need a separate EIN for federal tax purposes, though banking or state rules may.
Official sourceInternal Revenue Service: LLC EIN question and answer — This IRS LLC-specific question and answer controls the single-owner exception described below.

Start with the IRS LLC test

Federal resultTypical LLC fact patternWhat to do
Must have an EINThe LLC has more than one owner.Apply for a separate federal tax ID through the IRS.
Must have an EINThe LLC has employees or must file relevant employment- or excise-tax returns.Use the free IRS route before the tax or employment filing is due.
Must have an EINA one-owner LLC elects to be taxed as a corporation or S corporation.Confirm the election and EIN sequence with the IRS or a qualified tax professional.
May be optional federallyOne owner, no employees, no relevant excise-tax obligation, and no corporate election.The owner may use the owner’s tax ID for federal income-tax reporting, but can still request an EIN.
May still be requestedA bank, state tax agency, licensing process, or business counterparty asks for an EIN.That request can matter even when the federal income-tax rule does not independently require one.

This table is an educational reading of IRS guidance, not tax advice for a particular return or election.

Single-member LLC: when an EIN may not be required

For federal income-tax purposes, the IRS generally treats a one-owner LLC as disregarded unless it elects another classification. The IRS says a disregarded one-owner LLC with no employees and no relevant excise-tax liability generally does not need a separate EIN; it uses the owner’s name and tax ID for federal income-tax reporting.

That does not mean an EIN is unavailable or that no other institution can ask for one. The IRS says the LLC may apply for an EIN for banking or state-tax purposes. If the business later hires, has a relevant excise-tax obligation, or makes a corporate tax election, revisit the federal rule before filing.

Official sourceInternal Revenue Service: Single-member limited liability companies — See the IRS section on disregarded single-member LLCs, employees, excise-tax obligations, banking, and state-tax purposes.

Do I need an EIN to open a business bank account?

The federal tax rule and a bank's account-opening policy are different questions. The IRS says a disregarded single-member LLC without employees or relevant excise-tax liability may not need a separate EIN for federal income-tax reporting, while also noting that the LLC may request an EIN for banking or state-tax purposes.

That means this guide cannot promise that every bank will accept an owner's SSN, and it should not claim federal law always requires an EIN just because a bank asks for one. Check the bank's current account-opening requirements separately, then use the free IRS route if you decide to obtain an EIN.

Official sourceInternal Revenue Service: Single-member limited liability companies — The IRS distinguishes the federal income-tax rule from optional EIN use for banking or state-tax purposes.

Multi-member LLC: a separate federal tax ID is required

The IRS’s LLC FAQ states that an LLC that is not a sole-owner LLC must have a separate federal tax identification number. Do not use this page’s single-owner exception for a multi-member business, even if the company is newly formed or has not hired anyone yet.

Official sourceInternal Revenue Service: LLC EIN question and answer

Employees and excise taxes change the federal answer

The IRS lists hiring employees and certain employment- or excise-tax responsibilities as EIN triggers. A disregarded one-owner LLC must use its own EIN for employment taxes and certain excise taxes rather than the owner’s SSN or EIN. The exact return and filing date depend on the facts, so verify the relevant IRS instruction before treating the company as ready to hire.

Official sourceInternal Revenue Service: Get an employer identification number — The IRS EIN hub lists employees and certain tax obligations among common EIN triggers.

See the California first-hire path after the federal EIN step →

Continue from the EIN into the first-payroll readiness checklist →

A tax election is a boundary for professional advice

This guide does not recommend an LLC tax classification or tell you whether to elect corporate or S-corporation treatment. The IRS says a new one-owner LLC that elects to be taxed as a corporation or S corporation needs a new federal tax ID. Before making or changing an election, use the IRS materials and seek qualified tax advice for facts specific to your owners, compensation, returns, and timing.

Official sourceInternal Revenue Service: LLC EIN question and answer

Form the legal entity first, then apply

  1. Decide whether an LLC is the appropriate entity and form it with the relevant state filing office.
  2. Use the accepted legal name and entity details when you apply for the EIN.
  3. Keep the IRS confirmation with the entity’s formation records.
  4. Complete state, licensing, banking, and first-hire requirements separately; an EIN alone does not form an LLC, create limited liability, or select a tax treatment.
Official sourceInternal Revenue Service: Get an employer identification number — The IRS directs people forming a legal entity to form it through the state first, then apply for the EIN.

Four-question EIN self-check

This educational tool runs only in your browser. It creates no account, uses no storage, sends no form, and makes no network request. It does not prepare a tax filing or determine an election.

No answer leaves this page. This is not tax advice.

Likely federal route

May be optional for federal tax purposes

A one-owner LLC with no employees, relevant excise-tax obligation, or corporate election may not need a separate EIN for federal income-tax reporting.

A bank, state agency, or licensing process may still ask for an EIN. Confirm its own requirement separately.

Open the free official IRS EIN page

Need a new EIN? Ownership and structure matter more than a name change

A new EIN is a separate question from whether an LLC needs one now. The IRS says a business generally needs a new EIN when ownership or structure changes in certain ways, while a business-name or address change alone generally does not create that result. The answer varies by entity type, so use the IRS entity-specific examples rather than assuming an old number always carries forward.

  • Name or address change: generally not enough by itself to require a new EIN.
  • Ownership or entity-structure change: can trigger a new EIN depending on the entity and transaction.
  • Unclear reorganization or tax-classification facts: verify the IRS rule and get qualified tax advice before reusing an EIN.
Official sourceInternal Revenue Service: When to get a new EIN — Use the IRS entity-specific examples, not a generic assumption, before changing or reusing an EIN.

The official IRS route is free

The IRS does not charge for an EIN. A paid website may offer preparation or submission assistance, but that is not an IRS fee and does not create a federal requirement. Before entering identifying information, confirm that you are on irs.gov and understand what any paid intermediary is offering.

Open the free IRS EIN application route

The online route has eligibility rules. The IRS EIN page lists alternatives for applicants who cannot use it.

Continue the launch path

Interactive pathFind the next formation-to-payroll checkpointDecision guideCompare direct filing with optional formation helpState decisionCheck whether you can be your own registered agentCalifornia pathPrepare to hire your first California employeePayroll readinessCheck what must be ready before employee #1 is paid

Evidence last reviewed August 31, 2026. View the official source ledger or see how we research and correct guides.