EIN applications are only an identifier, and the entity comes first

An Employer Identification Number is an identifier. That is the whole of it. It is the federal tax system's way of telling one taxpayer from another, in the same way a Social Security number does for an individual.

It confers no status, grants no permission, and protects nothing. People routinely treat getting one as a milestone, the moment the business became real, and then discover it did none of the things they assumed. This page is mostly about that gap, and about why so many EIN applications end up filed in the wrong order.

Nothing here is tax advice. Which number your situation needs, and when, is a question for whoever prepares your returns.

What to take away

What the number does

That last point is the practical reason most people get one, and it is a good reason.

What the number does not do

This list is longer, and it is the useful half.

The order matters

Where the identifier fits in the wider sequence is set out in forming an LLC.

The application ties the identifier to a specific taxpayer, named and structured in a particular way. Apply before the entity exists and you may get a number attached to you personally, or to an entity name the state later refuses because it is unavailable. Untangling that afterward is more work than waiting a few days.

The same logic applies to the name: settle what the entity is actually called (confirmed with the state's registry, not just decided in a meeting), before you attach a federal identifier to it. Copy that name from the state's record character for character, including punctuation.

In most states the document that creates the LLC is the articles of organization, filed with the business filing office — usually the secretary of state, or whichever office keeps the corporate registry. That filing, not the federal application, is what brings the entity into existence, and the name that appears on the state's record is the name the identifier has to match, character for character.

The responsible party

The application asks who controls the entity. This is not a formality and it is not the accountant, the filing service, or the lawyer. It is meant to be a real person with genuine authority over the business and its funds.

That person must be a real individual, holding a valid SSN or ITIN of their own. The entity cannot be its own responsible party, and a nominee does not satisfy the requirement. Form SS-4 and its instructions say who may be named as responsible party and which identification number belongs on the form, including what to do when the person has no Social Security number or ITIN of their own.

Two things follow:

Who actually needs one

The clear cases are structural. Entities with more than one owner, as described in partnership formation, and entities taxed as corporations, as described in corporation formation, need their own federal identifier. Anyone with employees generally does too.

Sole proprietors with no employees, described in operating without an entity, often do not strictly need one. Many get one anyway to avoid handing out a Social Security number, which is a perfectly good reason.

The boundary cases depend on facts: certain trusts, certain retirement arrangements, certain excise obligations, and businesses that withhold in particular circumstances. The IRS answers the structural ones directly on its "Do You Need an EIN?" page at irs.gov, which lists who must have one and includes a section on when a change in the business requires a new number. A single-member LLC with no employees and no excise tax liability is not required to have its own federal identifier at all and may use the owner's Social Security number, though many owners get one anyway. Rather than reason from a general description, check the IRS's own criteria, which is where the current answer lives.

Apply directly

Apply through the IRS itself. Its online application, the EIN Assistant, is the fastest route, and its application page lists current channels and any conditions. The channels are the online application, fax, and mail, and the fax and mail routes both use Form SS-4. Whichever channel you use, the IRS charges nothing for the number.

Typical timing: the online route usually issues the number at the end of the session. A faxed Form SS-4 typically takes about four business days, and a mailed one typically takes four to six weeks. Times vary, so check the IRS page for the current figures.

Have the entity's address of record and the responsible party's identifying details to hand before you start. The application is not a form to fill in creatively, and any question you have not already settled is a reason to stop and settle it.

Intermediaries offer to get the number for you. They sell the act of submitting an application you can submit yourself, and some bundle it into formation packages with charges not itemized. Since the IRS charges nothing, whatever you pay is for the submission and any hand-holding, not for the identifier. Ask for that fee as its own line before you agree to anything.

If you use a service, at least know what you are paying for. Check the IRS site for the current application channels and any conditions attached to them before you decide.

When a change means a new number

Some changes to a business let it keep its existing identifier. Others require a new one. Which is which depends on the nature of the change: a change of name, a change of address, a change of ownership, and a change of entity type are not treated alike.

Both errors are costly. Applying for a new number while the old one was valid splits your history across two identifiers. Using an old number after a change that required a new one attaches your filings to the wrong taxpayer.

Do not reason from first principles. The IRS publishes the situations that call for a new number, and the "Do You Need an EIN?" page lists them alongside the changes that leave the existing number in place. Look yours up before acting.

Keep the record where you can find it

Once issued, the number ends up on returns, bank records, payroll systems, information returns, insurance certificates, credit applications, and vendor onboarding forms. Store the confirmation somewhere durable and somewhere your accountant and bookkeeper can reach, not only in your email. A single list of every identifier is the habit that post-formation changes depends on when details go stale.

Check the name and address on the confirmation against the formation documents the state accepted. Check that the person named as responsible party is the person you actually named.

Store the CP 575 notice if the IRS mails one, and keep the confirmation letter issued at the end of an online application. If the notice is lost, request a 147C letter from the IRS, which restates the same details. If the responsible party changes later, update the IRS record.

The related habit worth building: keep a single list of every identifier the business has. Federal identifier, state registration number, state tax accounts, local license numbers, and the registry file number for the entity itself. They come from different authorities on different schedules, and the moment you need one is never the moment you have time to find it.

Common questions

Can I get an EIN before I have any customers?

Yes, and it is normal to. The constraint is the entity, not the trading: the number should attach to a taxpayer that already exists in the form you intend to keep.

Do I need a separate EIN for a DBA?

A trade name is not a separate taxpayer. It is a name under which an existing person or entity operates, so it generally does not get its own federal identifier. DBA registration explains what a name filing does and does not create.

What if I have several businesses?

Separate identifiers depend on whether they are separate taxpayers, separate entities, or several activity lines inside one. That is a legal-form question before a numbers question.

The trade-offs are in entity type selection. This distinction matters because it also decides whether a problem in one can reach the others.

I got an EIN years ago and never used it. Is it still mine?

Federal identifiers are not reissued to someone else, but a long-dormant one attached to an entity that no longer exists in the form you described is not necessarily the number you should be filing under now. Ask your accountant before reusing it.

Is the EIN what makes me look legitimate to a bank?

Banks generally want the identifier, the formation document from the state, and evidence of who is authorized to act for the entity. The number alone is one piece of a set.