How to Obtain an EIN for Your Business: A Step-by-Step Guide

An Employer Identification Number, or EIN, is one of the first tax identifiers many new business owners need after forming a company. It is issued by the IRS and used to identify a business for federal tax purposes, banking, hiring, and other routine business activities.

If you are starting an LLC, corporation, partnership, or certain other entity, understanding how to obtain an EIN early can save time and prevent avoidable delays. In many cases, the process is straightforward. In others, especially when ownership, location, or entity structure creates extra requirements, it helps to approach the application carefully.

This guide explains what an EIN is, who needs one, how to apply, what information you need, and how to avoid common mistakes.

What Is an EIN?

An EIN is a nine-digit federal tax identification number assigned by the IRS. It functions much like a Social Security number, but for a business or other entity rather than an individual.

The IRS uses EINs to track tax accounts, employment records, and certain reporting obligations. Banks, lenders, payment processors, and state agencies also often ask for an EIN when you open accounts or complete registration steps.

Why Your Business May Need an EIN

Many new owners assume an EIN is only required once employees are hired. In reality, the number is useful well before payroll begins.

You may need an EIN if your business:

• Has employees now or plans to hire them
• Operates as a partnership, corporation, or many LLCs
• Needs to open a business bank account
• Applies for business licenses or permits
• Files federal tax returns or employment tax returns
• Withholds taxes for certain workers or payments
• Needs a federal tax ID for banking or state-level reasons even when one is not strictly required for federal taxes

If you are forming a new legal entity, you generally should register the entity with your state first and then apply for the EIN.

When You Should Apply for an EIN

The best time to apply is after your entity is formed but before you need to start banking, hiring, or filing returns.

That timing matters because some business activities can begin immediately after you receive the number. For example, you may need it to open a business account, apply for licenses, or start onboarding employees.

If you wait too long, you can run into delays with payroll setup, tax filings, and payment processing.

How to Obtain an EIN

The IRS offers several ways to apply for an EIN. The best method depends on where your business is located, how quickly you need the number, and whether you are eligible to apply online.

1. Apply Online

For many U.S.-based businesses, the online IRS application is the fastest option. It is typically available only to applicants with a legal residence, principal place of business, or principal office in the United States or U.S. territories.

The online application is usually the most efficient path because you can often receive the EIN immediately after completing the session. The responsible party for the business must have a valid taxpayer identification number, such as an SSN, ITIN, or existing EIN, to use the online process.

A few practical tips:

• Complete the application in one sitting
• Gather all entity and ownership details before starting
• Double-check the responsible party information
• Save or print the confirmation notice at the end of the session

2. Apply by Fax

Fax filing can be useful if you are not eligible for the online process or prefer a paper-based application. You complete Form SS-4 and send it to the IRS by fax.

This method is slower than online filing, but it can still be a practical option when you want a written record and do not need the number instantly.

3. Apply by Mail

Mail filing is the slowest route, but it remains available for applicants who cannot use the other methods. It is generally best when timing is not urgent and you want to submit a physical form.

Because mail processing can take longer, this is usually the least convenient choice for new businesses that need to launch quickly.

4. Apply by Phone, If You Are Outside the U.S. or U.S. Territories

Applicants whose principal business location is outside the United States or U.S. territories may need to apply by phone or use another IRS-approved method.

Foreign owners and international businesses should pay close attention to the IRS instructions before submitting anything. Extra care at this stage helps avoid rejected applications, duplicate EINs, or unnecessary back-and-forth with the IRS.

Information You Need Before You Apply

Whether you apply online or by Form SS-4, the IRS will ask for specific details about your business.

Be ready with:

• The legal name of the entity
• The business trade name, if different
• The entity type, such as LLC, corporation, partnership, estate, trust, or sole proprietorship in certain cases
• The reason you are applying
• The business address and mailing address
• The name and taxpayer identification number of the responsible party
• The number of members, owners, or partners, if applicable
• The date the business started or acquired assets
• The expected highest number of employees in the next 12 months
• The principal business activity
• Whether you expect to file employment, excise, or other federal tax returns

A complete application is less likely to be delayed. Missing or inconsistent details are one of the most common reasons for processing problems.

Common Mistakes That Slow Down EIN Applications

A straightforward EIN application can still be delayed by small errors. The most common issues include:

• Applying before the entity is legally formed
• Using the wrong entity classification
• Entering the responsible party information incorrectly
• Submitting duplicate applications for the same entity
• Choosing an application method that does not match the business location
• Forgetting to save the confirmation notice
• Failing to review the form before submission

If your business has multiple owners or a more complex structure, take extra time to confirm that every field matches the legal formation documents.

How Long Does It Take to Get an EIN?

Timing depends on the filing method.

• Online applications can often be completed immediately
• Fax applications usually take longer, but can still be processed relatively quickly
• Mail applications take the longest

If you are planning a bank account opening, payroll setup, or license application, factor EIN timing into your launch schedule early.

What You Can Do After You Receive the EIN

Once the EIN is issued, you can begin using it for many common business tasks.

You may need it to:

• Open a business bank account
• Set up payroll
• Apply for local, state, or federal licenses
• File business tax returns
• Work with vendors, lenders, and financial platforms
• Register for state tax accounts, if required

In most cases, a business can start using the EIN right away for key administrative steps.

Do You Always Need a New EIN?

Not every business change requires a new number. Some updates, such as changing a business name, address, or responsible party, do not necessarily require a new EIN.

A new EIN is generally needed when the entity ownership or structure changes in a way that the IRS treats as a new business for tax purposes.

If you are unsure whether your situation requires a new number, review the IRS rules before making the change.

Special Considerations for Foreign Owners

Foreign owners often face additional steps when applying for an EIN. The process may not be as simple as completing the online application, especially when the principal place of business is outside the United States.

This is one area where preparation matters. International applicants should confirm which filing method is available, whether a third-party designee is authorized, and whether their business structure creates any additional IRS requirements.

For founders working across borders, a careful application process is essential because delays can affect banking, contracting, and tax setup.

How Zenind Supports New Business Owners

For founders focused on launching an LLC or corporation, the EIN is one piece of a larger formation workflow. Zenind helps business owners stay organized through the formation process so they can handle critical steps like registration, tax identification, and compliance more efficiently.

If you are setting up a new company, the best approach is to treat the EIN as part of the broader launch checklist, not as an isolated task. That mindset reduces missed steps and helps your business move from formation to operation more smoothly.

Final Thoughts

Knowing how to obtain an EIN is essential for launching and operating a business with confidence. For many U.S.-based entities, the process is simple and can be completed online. For foreign owners, more complex structures, or businesses with timing constraints, the application requires a more careful approach.

Start by forming your entity, gathering the correct information, and choosing the right application method. With a clean application and a clear filing plan, you can usually secure the EIN you need without unnecessary delays.