EIN Third-Party Designee: SS-4 Authorization and Expiration

On an EIN application, a third-party designee is anyone the responsible party names in the designee section of Form SS-4 to help see the application through. That can be an accountant, an attorney, a paid preparer, or a trusted colleague. Their authority is deliberately narrow: they can answer IRS questions about how the form was filled out, work through technical issues during processing, and receive the EIN once it is assigned.1Internal Revenue Service. Instructions for Form SS-4

Who You Can Name

The IRS does not restrict the designee to a licensed professional. There is no credentialing requirement in the Form SS-4 instructions, and no separate enrollment step. What matters is that the responsible party — the individual who controls or manages the entity — makes the designation on the form itself.

In practice, the designee is usually the person actually preparing the application: a CPA handling formation paperwork for a new business, an attorney forming an entity for a client, or a firm colleague who is filing on behalf of the person in charge. The IRS also allows a third-party designee to use the online EIN application, provided the designee has signed authorization from the responsible party on file.2Internal Revenue Service. Get an Employer Identification Number

What the Designee Can Do

The designee’s role covers three things:

  • Answering IRS questions about how Form SS-4 was completed.
  • Resolving technical issues that come up while the application is being processed.
  • Receiving the assigned EIN once it is approved and released.1Internal Revenue Service. Instructions for Form SS-4

That is the whole scope. A designee cannot represent the entity in later tax matters, cannot inspect confidential tax records outside the SS-4 process, and cannot sign agreements on the entity’s behalf. Ongoing representation before the IRS requires a separate authorization — Form 2848 for power of attorney, or Form 8821 for tax information authorization. A Form 2848 representative can inspect confidential records, sign agreements, and generally act for the taxpayer on the covered matters. An SS-4 designee has none of that reach.3Internal Revenue Service. Form 2848 – Power of Attorney and Declaration of Representative4Internal Revenue Service. Know the Different Types of Authorizations for Third-Party Representatives

How to Authorize the Designee on Form SS-4

The authorization sits in a dedicated section near the bottom of Form SS-4. To complete it, the responsible party enters:

  • The designee’s full legal name.
  • The name of any professional firm the designee works for.
  • A direct telephone number where the IRS can reach the designee during processing.
  • A fax number, if you have one — helpful when filing by fax, since IRS service centers often reply that way.1Internal Revenue Service. Instructions for Form SS-4

Leaving any required field blank in that section, or omitting the signature discussed below, causes the IRS to disregard the designee authorization.

Who Has to Sign

The authorization is only valid if the correct person signs Form SS-4. The IRS specifies who that is based on entity type:

  • For a corporation, the president, vice president, or another principal officer.
  • For a partnership or unincorporated organization, a responsible and authorized member or officer.
  • For a trust or estate, the fiduciary.1Internal Revenue Service. Instructions for Form SS-4

A missing or improper signature invalidates the designee authorization along with the rest of the application.

When the Authorization Ends

The designee’s authority is short-lived by design. It expires automatically when the EIN is assigned and released. Because the authority ends on its own, the IRS does not require any special revocation procedure for an SS-4 designee. Taxpayers can revoke any IRS authorization at any time, but with the designee slot there is nothing left to revoke once the EIN comes through.4Internal Revenue Service. Know the Different Types of Authorizations for Third-Party Representatives

If you want that person to keep helping with tax matters after the EIN issues — responding to notices, representing the entity in an examination, or accessing account transcripts — you need to file Form 2848 or Form 8821 separately. The SS-4 authorization does not roll over.

Cost of Filing

Applying for an EIN through the IRS is free, whether the responsible party files it or a designee does it on their behalf. The IRS explicitly warns against third-party websites that charge a fee to obtain an EIN.2Internal Revenue Service. Get an Employer Identification Number A designee may of course charge for their own professional time, but the government charges nothing for issuing the number.

International Applicants

Applicants outside the United States can still name a designee on Form SS-4 the same way, but the filing channels differ. International applicants can apply by telephone at 267-941-1099 (not toll-free), Monday through Friday from 6:00 a.m. to 11:00 p.m. Eastern time. The fax numbers are 855-215-1627 from inside the United States and 304-707-9471 from outside. Mailed applications go to IRS, Attn: EIN International Operation, Cincinnati, OH 45999. When the responsible party has no SSN or ITIN and is not eligible for one, enter “foreign” or “N/A” on line 7b; the line cannot be left blank.1Internal Revenue Service. Instructions for Form SS-4

A Common Point of Confusion

Naming a designee is not the same as naming the responsible party. The responsible party is the actual person who controls, manages, or directs the entity and its funds, and that person must be a real individual with an SSN or ITIN on the application — not a nominee, and not another entity.5Internal Revenue Service. Responsible Parties and Nominees The designee sits in a separate slot and helps that person get the EIN. Confusing the two, or trying to route control of the entity through the designee line, is not what the form is for.