How to Get an EIN for Your Business: A Step-by-Step Guide for New U.S. Companies

If you are starting a business in the United States, one of the first administrative steps you will likely need to handle is getting an Employer Identification Number, or EIN. An EIN is the federal tax ID used by the IRS to identify a business entity for tax reporting and other official purposes.

For many founders, the EIN is more than a formality. It is often needed to open a business bank account, hire employees, file certain tax forms, and complete state or financial institution requirements. If you are forming a new LLC or corporation, getting this number early can help you move from formation paperwork to real operations without delays.

This guide explains what an EIN is, who needs one, how to apply, what information to prepare, and the mistakes to avoid.

What Is an EIN?

An EIN is a nine-digit federal tax identification number assigned by the IRS. You can think of it as the business equivalent of a Social Security number, but it is used for the business itself rather than for an individual.

The IRS uses the EIN to track business tax accounts and filing obligations. Businesses, estates, trusts, and certain other entities may need one depending on how they are organized and what activities they conduct.

Why Businesses Need an EIN

Many new business owners need an EIN sooner than they expect. Common reasons include:

• opening a business bank account
• hiring employees
• filing payroll taxes
• forming a partnership, corporation, or multi-member LLC
• applying for certain business licenses or state tax registrations
• filing excise tax or employment tax returns
• establishing credit or vendor accounts in the business name

Even when a business is not strictly required to have one, obtaining an EIN can still be practical. It helps separate business activity from personal information and gives the company a more established administrative profile.

Who Needs an EIN?

The IRS generally requires an EIN for:

• corporations
• partnerships
• LLCs with multiple members
• businesses with employees
• businesses that file excise, employment, or certain retirement plan taxes
• estates and trusts in many cases
• nonprofits and other tax-exempt organizations

A sole proprietor may not always need an EIN, but there are exceptions. For example, if a sole proprietor hires employees or files certain tax returns, an EIN may be required. Some sole proprietors also choose to get one to avoid using a Social Security number for business transactions.

If you are not sure whether your business structure requires an EIN, it is wise to review your entity type, state obligations, and federal filing requirements before proceeding.

When to Apply for an EIN

The best time to apply is after your business entity has been formed and before you begin activities that require the number.

If you are forming an LLC, corporation, or partnership, complete the legal formation process first. The IRS expects the legal entity to exist before the EIN application is filed. Applying too early can create delays if the entity details do not match the state formation records.

Many founders apply as soon as they have:

• the exact legal name of the entity
• the formation state
• the responsible party’s identification information
• a business address and mailing address
• a basic understanding of how the business will be taxed

How to Apply for an EIN

The IRS offers several application methods, but the best method depends on where your business is located and how quickly you need the number.

1. Online Application

For applicants with a legal residence, principal place of business, or principal office in the United States or U.S. territories, the IRS online application is the fastest option. It is the preferred method for many domestic applicants because the EIN can usually be issued immediately.

To use the online application, the responsible party must have a valid taxpayer identification number, such as an SSN, EIN, or ITIN.

This method is often the simplest route for founders who want to move quickly from formation to banking, payroll setup, and state registrations.

2. Fax Application

Fax filing is another option. The IRS generally processes faxed Form SS-4 applications within a few business days, although timing can vary.

Fax applications can be useful when the online option is unavailable or when a founder prefers to submit the form manually.

3. Mail Application

Mail filing is the slowest option. It is best for founders who do not need the EIN immediately and are comfortable waiting several weeks for processing.

Mail is usually a fallback method rather than the first choice for time-sensitive formations.

4. Telephone Application for International Applicants

International applicants may be able to apply by telephone. Domestic applicants in the United States generally do not receive EINs by phone.

If your business is located outside the U.S. or you are applying from abroad, confirm the current IRS procedure before filing so you use the correct method.

Information You Need Before Filing Form SS-4

The IRS uses Form SS-4 to collect the information needed for an EIN. Before you start, gather the following details:

• legal name of the entity exactly as it appears on formation documents
• any trade name or DBA, if applicable
• mailing address
• street address or principal business location
• county and state where the business is located
• name and taxpayer ID of the responsible party
• entity type, such as LLC, corporation, partnership, estate, or trust
• reason for applying
• date the business was started or acquired
• expected number of employees
• type of business activity
• information about the services, products, or goods the business will provide
• prior EIN information, if the entity ever had one before

Having this information ready makes the application much smoother and reduces the chance of rejection or follow-up questions.

Understanding the Responsible Party

The responsible party is the individual who ultimately controls, manages, or directs the business or entity. In most new businesses, this is the owner, member, or principal officer.

The IRS uses the responsible party to identify the person connected to the EIN application. This information matters because it ties the business tax account to a real person and helps the IRS verify the filing.

It is important that the responsible party information is accurate and consistent with the entity’s formation documents and tax records.

How to Classify Your Entity Correctly

A common source of delays is choosing the wrong tax classification on the EIN application.

Here is the general framework:

• single-member LLCs are often treated as disregarded entities for federal tax purposes unless they elect a different tax status
• multi-member LLCs are generally treated as partnerships unless they elect corporate taxation
• corporations are treated as corporations for EIN purposes, including S corporations and C corporations
• nonprofits and tax-exempt organizations should follow the applicable entity and tax rules for their structure

The EIN application asks for entity type and tax classification details, so you should understand how your business is organized before submitting the form.

Common Mistakes to Avoid

Even though the EIN application is straightforward, small mistakes can slow it down. Watch out for the following issues:

• using the wrong legal name instead of the name on state formation records
• applying before the entity is legally formed
• entering the wrong responsible party information
• confusing the business address with a mailing address
• selecting the wrong entity classification
• reapplying multiple times for the same entity
• forgetting to sign where required on a paper submission
• using a method that does not match your location or filing needs

One of the most important rules is to use only one application method for each entity. Submitting multiple applications can create duplicate EIN issues and extra cleanup work.

How Long Does It Take to Get an EIN?

Processing time depends on how you apply:

• online applications can be issued immediately for eligible U.S. applicants
• fax applications are often processed in a few business days
• mailed applications can take several weeks
• international telephone applications may be available depending on IRS procedures

If you need the EIN for a bank account, payroll setup, or a time-sensitive filing, the online method is usually the best choice.

Is the EIN Free?

Yes. The IRS does not charge a filing fee for an EIN.

That said, while the EIN itself is free, business owners may still pay for related services such as entity formation, registered agent support, compliance assistance, or help preparing the application.

What You Can Do After Receiving the EIN

Once your EIN is issued, you can begin using it for several business tasks, including:

• opening a business bank account
• applying for business licenses and permits
• setting up payroll and contractor reporting systems
• registering for state tax accounts where required
• filing business tax returns
• establishing vendor and credit relationships in the business name

In many cases, the EIN is the missing piece that allows a new company to move from formation into operations.

How Zenind Can Help New Business Owners

For founders building a U.S. company, the EIN step is just one part of the startup process. Zenind helps business owners stay organized through the formation journey and beyond, so they can focus on launching instead of juggling paperwork.

If you are forming an LLC or corporation, Zenind can help you keep your formation workflow structured and ready for the next steps, including EIN preparation and related compliance tasks.

That matters because the EIN should fit into a broader launch plan that includes state formation, banking, operating agreements, and ongoing business maintenance.

EIN Application Checklist

Use this quick checklist before you apply:

• confirm the entity is already formed
• verify the exact legal business name
• identify the responsible party
• confirm the business address and mailing address
• determine the correct entity classification
• gather the date the business started
• estimate employees if applicable
• prepare a short description of the business activity
• choose the application method that fits your timeline

Frequently Asked Questions

Do I need an EIN to form an LLC?

Not always. But many LLCs need one for banking, tax, or payroll reasons, and multi-member LLCs generally need one.

Can I get an EIN the same day?

Yes, if you are eligible to apply online and your application is accepted.

Can I use my EIN immediately?

In many cases, yes. Businesses often use the EIN right away for banking and registration purposes once it is issued.

Do sole proprietors need an EIN?

Some do, but not all. The need depends on employees, tax filings, and how the business operates.

Can I change my EIN later?

An EIN generally stays with the entity once assigned. If your business changes in certain major ways, you may need to update IRS records rather than request a new number.

Final Thoughts

Getting an EIN is one of the most important early steps in launching a U.S. business. It helps you establish the company for federal tax purposes, open financial accounts, and complete key administrative tasks after formation.

The process is straightforward when you prepare the right information in advance and choose the filing method that fits your timeline. For many new founders, getting the entity formed first and then applying for the EIN right after is the cleanest path.

If you are starting a new company and want a more organized formation workflow, Zenind can help you stay on track from entity setup through the next steps of business launch.