美國 EIN 每日一份與第三方設計人授權

美國 EIN 每日一份與第三方設計人授權：The Direct Answer

If you are applying for a US Employer Identification Number (EIN) online, two rules shape how you should prepare. First, the IRS online tool allows only one EIN per responsible party per day. Second, if someone other than the responsible party is completing the application — for example, a third-party designee such as an accountant, formation agent, or a designer helping a client set up a US company — that person must have signed authorization to apply. These are not administrative preferences; they are conditions built into the free IRS online application process itself.

The IRS describes its EIN tool as a way to get an EIN directly from the IRS in minutes, free of charge: you answer questions, submit the application, and if it is approved, the EIN is issued immediately online (Internal Revenue Service, Get an employer identification number). The same source warns applicants to beware of websites that charge for an EIN, noting that you never have to pay a fee for an EIN. That single sentence is worth keeping in view, because much of the confusion around “daily limits” and “authorization” comes from intermediaries rather than from the IRS process itself.

The practical scope of this article is narrow and specific. It covers what the one-EIN-per-day rule means for a responsible party, what “signed authorization” means when a third-party designee applies, and how these two constraints interact when a US company formation involves several people — a founder, an agent, and a designer or consultant who is not the responsible party. It does not cover state-level registration, registered agent requirements, or tax filing obligations, except where those topics touch on who may apply for an EIN and when.

A useful way to frame the decision: the EIN application is a single-session task with a hard daily ceiling per responsible party, and any delegation of that task requires documented consent. If your project involves more than one entity, more than one responsible party, or a third party acting on someone else’s behalf, plan the sequence before you open the tool.

Who Should Plan Around the One-EIN-Per-Day Limit and Third-Party Designee Authorization

Two groups feel these rules most. The first is the responsible party — the individual the IRS treats as accountable for the entity. The second is anyone acting on that person’s behalf, including a third-party designee such as an accountant, formation agent, or a designer helping a client stand up a US company. If you fall into either group, the planning question is not whether the rules apply, but how to sequence your work so a single session is enough.

Applicants Who Should Prepare Before Opening the Tool

According to the IRS “Apply for an Employer Identification Number (EIN) Online” page, the online tool issues an EIN directly from the IRS in minutes and free of charge, and the application must be completed in one session because it cannot be saved for later. The same source notes the session expires after 15 minutes of inactivity, at which point you must start over. For a responsible party applying for one entity, that is manageable. For a designer or agent handling several client entities, it is not: the IRS states you can request only one EIN per responsible party per day. If you are the responsible party for multiple entities, or you are applying for several clients, you cannot batch them into one sitting.

The Authorization Question for Third-Party Designees

The IRS page is explicit: “If you’re a third-party designee, you must have signed authorization to apply.” That means a designer, bookkeeper, or agent cannot simply fill in the form on a client’s behalf without documented permission. Before the session begins, confirm who the responsible party is, that the signed authorization exists, and that the business name you will enter conforms to the formatting rules the IRS applies. The IRS also warns applicants to beware of websites that charge for an EIN, noting you never have to pay a fee for one — a useful check when a client asks why a third party is involved at all.

Main Planning Decisions

Three decisions follow. First, decide who will be the responsible party for each entity, because that choice determines the daily limit. Second, decide the order of applications across days rather than hours. Third, decide how authorization will be documented and retained before any session starts. The IRS tool is free and fast, but it rewards preparation over improvisation.

Preparing to Apply: What to Gather Before You Open the IRS Tool

Preparation is where most avoidable problems are solved. The IRS online application must be completed in a single session, and it expires after 15 minutes of inactivity, after which you must start over. Because you cannot save the form for later, the practical approach is to assemble everything you need before you begin, so that the session is spent answering questions rather than searching for documents.

Information the Responsible Party Should Have Ready

At a minimum, the responsible party should have the legal name of the entity, the entity type, the reason for applying, and the identifying details the IRS asks for on the form. The business name entered must conform to certain formatting rules, so it is worth checking the exact spelling and structure of the name in advance rather than improvising during the session. If a third-party designee will complete the application, that person must have signed authorization to apply — the authorization should be obtained and kept before the session opens, not after.

Sequencing the One-EIN-Per-Day Limit Into Your Plan

The IRS allows only one EIN per responsible party per day. If the same responsible party is involved in more than one entity, or if several applications are being prepared at once, the order in which they are submitted matters. Deciding the sequence beforehand prevents a completed application from being blocked by a limit that was already used earlier the same day.

A Note on Fees and Confirmation

The IRS tool is free, and the IRS warns applicants to beware of websites that charge for an EIN, because you never have to pay a fee for an EIN. After submission, if the application is approved, the EIN is issued immediately online, and the confirmation letter should be printed for your records. The tool is generally available Monday to Friday, 6:00 a.m. to 1:00 a.m. the next day, so scheduling the session inside that window is part of the preparation.

How the One-EIN-Per-Day Rule and Third-Party Designee Authorization Work in Practice

The IRS online application is designed to be completed in one sitting, and the IRS states that a third-party designee must have signed authorization to apply. Those two facts define the practical workflow: confirm who the responsible party is, confirm who is authorized to act, then complete the session without interruption.

Step 1: Identify the Responsible Party

The responsible party is the individual the IRS treats as accountable for the entity. That person’s identity determines whether the daily limit has already been used, so this step comes first. If the responsible party has already obtained an EIN that day, the next application should be scheduled for another day rather than attempted in the same session.

Step 2: Confirm Signed Authorization for Any Third-Party Designee

Where a designer, accountant, or formation agent completes the application on someone else’s behalf, the IRS requires signed authorization from the responsible party. This is a documentation step, not a formality. The authorization should exist before the tool is opened, because the session cannot be saved and restarted later.

Step 3: Complete the Application in One Session

The IRS tool must be completed in a single session. It expires after 15 minutes of inactivity, and the applicant must start over if that happens. Working through the questions in order, with the business name formatted correctly and all details at hand, keeps the session inside that window.

Step 4: Record the Outcome and Sequence the Next Filing

If the application is approved, the IRS issues the EIN immediately online. If the responsible party needs a second EIN, the one-per-day limit means the next attempt belongs on a different day. Planning the sequence in advance avoids a wasted session and keeps third-party work moving without unauthorized attempts.

For a broader checklist covering what to gather before opening the tool, see the related resource on this service page.

Document and Evidence Checklist for a Third-Party Designee Application

When a third-party designee applies for an EIN on behalf of a client, the file should be able to answer two questions at any later date: who was the responsible party, and who was authorized to act. The checklist below is organized around that idea. Each category exists because the online session is completed in one sitting and cannot be saved for later, so anything missing at the moment of application becomes a reason to start over rather than a reason to pause.

1. Entity Formation Evidence

Have the filed formation document and any state confirmation available. Delaware, for example, requires every business entity to maintain a registered agent in the state, and the Division of Corporations publishes its formation forms and filing instructions online (Delaware Division of Corporations, “LLC Registration”). This category matters because the EIN application asks for entity type, state of formation, and formation date, and the designee should be reading those details from a source document rather than from memory.

2. Responsible Party Identification

Record the full legal name and identifying details of the individual the IRS treats as accountable for the entity. This is the single most important field in the file, because the one-EIN-per-day limit is measured against that person, and because the authorization to apply runs from that person to the designee.

3. Signed Third-Party Designee Authorization

Keep a signed authorization on file. The IRS states that a third-party designee must have signed authorization to apply. This category matters because it is the evidence that separates an authorized application from an unauthorized one, and it should be retained with the entity’s records rather than discarded after submission.

4. Session Readiness Notes

Prepare the answers the online form will request before opening the tool, and note the 15-minute inactivity timeout so the session is not abandoned midway. This category matters because a restarted session may collide with the one-EIN-per-day limit if the responsible party has already been used that day.

5. A Retention Copy

Save the confirmation and the supporting documents together. If a later question arises about who applied or under what authority, the file — not recollection — should provide the answer.

Realistic Scenarios: When the One-EIN-Per-Day Rule and Third-Party Designee Authorization Shape Your Plan

The rules matter most when timing is tight or when more than one person is involved. Consider four common situations.

Scenario 1: A Designer Setting Up Several Client Entities

A designer or agency helping multiple clients form US companies may need to apply for more than one EIN. Because the IRS online tool issues one EIN per responsible party per day, applications tied to the same responsible party cannot all be completed on the same day. The practical response is to sequence the work: confirm each client’s responsible party, then spread applications across days rather than attempting them back to back. Where the designer is acting as a third-party designee, the IRS states that the designee must have signed authorization to apply, so that authorization should be collected before the session begins.

Scenario 2: A Founder Who Is Also the Designer

When the same individual is both the responsible party and the person completing the form, the one-per-day limit still applies to that person. If the founder is forming a second entity the same day, the second application will need to wait. Planning the entity sequence in advance avoids a stalled session.

Scenario 3: An Accountant Applying on a Client’s Behalf

Here the third-party designee rule is the controlling fact. The IRS requires signed authorization before a third-party designee applies. The file should show who the responsible party is and who was authorized to act, so the arrangement can be explained later if questions arise.

Scenario 4: A Client Who Wants Everything Done in One Sitting

The IRS online application must be completed in one session and expires after 15 minutes of inactivity, after which you must start over. A client expecting a single uninterrupted sitting should understand that the one-per-day limit may make that impossible for multiple entities, and that a timeout means re-entry, not a saved draft.

Decision Points to Settle Before You Apply

Three questions resolve most of the ambiguity. Who is the responsible party? Who is authorized to act, and is that authorization documented? How many EIN applications are needed, and on which days can each be completed? Answering these before opening the IRS tool keeps the process predictable and reduces the chance of a wasted session.

Common Mistakes, Risk Controls and Practical Next Steps

Most problems with the one-EIN-per-day rule and third-party designee authorization are self-inflicted. They come from treating the online session as a form to fill in rather than a sequence to plan.

Mistake 1: Starting the session before the authorization exists

The IRS states plainly that a third-party designee must have signed authorization to apply. Signing after the fact inverts the order the rule assumes. The risk control is simple: obtain the signed authorization before opening the tool, and keep it with the entity file. If a designer or agency is helping a client, that authorization is the document that connects the client as responsible party to the person actually typing the answers.

Mistake 2: Treating the daily limit as a technicality

The IRS online tool issues one EIN per responsible party per day. Where several entities share the same responsible party, the applications cannot all be completed on the same day through that tool. The control is to map responsible parties to entities in advance, then sequence the applications across days rather than discovering the limit mid-session.

Mistake 3: Losing the session

The application cannot be saved and expires after 15 minutes of inactivity, after which you start over. Gathering names, addresses and identifiers beforehand is the only reliable control. For broader context on entity formation and the documents a registration file typically contains, the UK Companies House guidance on registering a company illustrates how formation records such as the statement of capital are prepared and submitted — a useful comparison for anyone assembling a US file.

Practical next steps

Confirm the responsible party in writing. Collect signed third-party designee authorization. Group entities by responsible party and spread applications across days. Assemble all answers before the session begins. Then retain the authorization, the application details and the issued EIN in one file, so the record answers both questions later: who was responsible, and who was authorized to act.

Closing Notes: Turning Two Rules into a Repeatable Filing Routine

The one-EIN-per-day limit and the third-party designee authorization requirement are best understood as scheduling and documentation constraints rather than obstacles. The IRS online tool issues an EIN immediately when the application is approved, and the IRS states that you never have to pay a fee for an EIN — so the real cost of poor preparation is time, not money. Because the application cannot be saved and expires after 15 minutes of inactivity, the discipline that matters is front-loading: confirm the responsible party, confirm who is authorized to act, and confirm the entity details before the session opens.

For a third-party designee — an accountant, formation agent, or designer assisting a client — the signed authorization is the anchor of the file. Keep it with the confirmation letter and the entity records so the file can answer, at any later date, who was responsible and who was authorized. Where multiple entities share the same responsible party, sequence the applications across separate days rather than attempting them in one sitting.

If you would like a structured way to organize these steps alongside your wider US company registration planning, our resource library collects the relevant checklists and reference notes in one place.

Frequently Asked Questions

Can I apply for more than one EIN in a single day?

The IRS online tool allows only one EIN per responsible party per day. If several entities share the same responsible party, plan the applications across separate days.

Does a third-party designee need written permission?

Yes. The IRS states that a third-party designee must have signed authorization to apply. Keep that authorization on file with the EIN confirmation letter.

Can I pause the online application and return later?

No. The application must be completed in one session, and it expires after 15 minutes of inactivity, after which you must start over.

Do I have to pay to obtain an EIN?

No. The IRS states that you never have to pay a fee for an EIN, and warns against websites that charge for one.

What should a designer or agency keep in the client file?

The signed authorization, the responsible party’s details, the entity information used in the application, and the EIN confirmation letter — enough to show who applied and on whose behalf.