How to Get an EIN for an LLC or Corporation

An Employer Identification Number, or EIN, is one of the most important identifiers a business can obtain after formation. If you are starting an LLC or corporation, an EIN is often needed to open a bank account, hire employees, file federal taxes, and complete many state and business registrations.

For many founders, the EIN is one of the first post-formation steps after filing the company’s formation documents. While the process is straightforward in concept, the details can be confusing if you are opening a new LLC, forming a corporation, or launching a business from outside the United States.

This guide explains what an EIN is, why it matters, who needs one, and how to apply the right way.

What Is an EIN?

An EIN is a nine-digit number assigned by the Internal Revenue Service to identify a business entity for tax purposes. It works as a federal tax ID for a company in much the same way that a Social Security Number identifies an individual.

An EIN is tied to the business, not to the owner personally. That distinction matters because it helps separate your personal finances from your company’s records and supports proper tax reporting.

Why Businesses Need an EIN

Most new business owners need an EIN for several practical reasons:

• Federal tax filing: The IRS uses the EIN to track business tax obligations.
• Payroll and hiring: If you hire employees, you need an EIN to withhold and report payroll taxes.
• Business banking: Many banks require an EIN before opening a business checking account.
• Licenses and permits: State and local applications often ask for a federal tax ID.
• Vendor and payment setup: Some vendors, processors, and platforms request an EIN during onboarding.

Even if your company is not hiring employees right away, an EIN can still be essential for day-to-day business operations.

Do LLCs Need an EIN?

Many LLCs do need an EIN, but the exact requirement depends on the structure and tax treatment of the business.

A single-member LLC may not always need one immediately if it has no employees and no separate federal tax filing requirement beyond the owner’s return. However, many single-member LLC owners still obtain an EIN to simplify banking, tax reporting, and business administration.

An LLC should generally have an EIN if it:

• Hires employees
• Files excise taxes
• Opens a business bank account
• Elects corporate taxation
• Needs a federal tax ID for business operations

If your LLC is being used actively, getting an EIN early is usually the practical choice.

Do Corporations Need an EIN?

Yes. A corporation needs its own EIN.

Unlike some single-member LLCs, a corporation is a separate legal entity that must use its own federal tax ID. The EIN is used for:

• Filing corporate tax returns
• Paying federal taxes
• Setting up payroll
• Opening bank accounts
• Applying for business licenses and permits

If you are forming a C corporation or S corporation, obtaining an EIN is a standard post-formation step.

When You Should Apply

The best time to apply for an EIN is usually after your business entity has been formed and approved by the state.

Applying too early can create avoidable issues if the business name, entity type, or responsible party details are not finalized. In general, you want the formation record in place first so the EIN application matches the official company information.

That said, there are situations where timing matters more than convenience. If you need a bank account, payroll setup, or a licensing application completed quickly, plan the EIN step as part of your initial launch checklist.

Information You Need Before Applying

Before submitting an EIN application, gather the key business details first:

• Legal name of the business
• Entity type, such as LLC or corporation
• State of formation
• Mailing address
• Responsible party information
• Date the business was formed or acquired
• Reason for applying
• Number of employees expected, if applicable

Having this information ready reduces errors and avoids delays.

How to Get an EIN

There are several ways to apply for an EIN, depending on your situation and where the responsible party is located.

1. Apply Online Through the IRS

For eligible applicants, the IRS online application is the fastest route. This option is generally available only when the responsible party has a U.S. Social Security Number or Individual Taxpayer Identification Number and meets the IRS eligibility rules.

If you qualify, the EIN may be issued quickly after the online application is completed.

2. Apply by Fax

If online filing is not available, faxing Form SS-4 to the IRS may be an option. This is often used by international founders or businesses whose responsible party cannot use the online IRS tool.

Fax processing typically takes longer than online filing, so it is best used when you do not qualify for immediate online submission.

3. Apply by Mail

Mail filing is the slowest method and is generally used only when other options are not practical. Because processing times can be lengthy, mail should usually be treated as a backup method rather than the preferred path.

4. Use a Business Formation Service

Many founders prefer to have a formation service handle the application as part of the business setup process. This can reduce mistakes, save time, and keep the EIN request aligned with the company formation documents.

Zenind supports entrepreneurs who want a streamlined formation experience, especially when the EIN is part of a broader launch plan.

Common Mistakes to Avoid

A simple EIN filing can still run into problems if the application is rushed or incomplete. Watch out for these common mistakes:

• Using the wrong legal business name
• Entering an entity type that does not match the formation records
• Submitting the application before the state filing is finalized
• Listing the wrong responsible party
• Choosing the wrong reason for applying
• Confusing an EIN with an ITIN or other tax identification number

Accuracy matters. If the information does not match your formation documents, the IRS may reject or delay the application.

EIN vs. Tax ID vs. ITIN

Business owners sometimes use the terms EIN and tax ID interchangeably, but they are not always the same thing.

• EIN: Federal tax ID for a business
• ITIN: Tax number for certain individuals who are not eligible for a Social Security Number
• Tax ID: A broader term that can refer to different tax numbers depending on the context

For an LLC or corporation, the number you usually need is an EIN.

Can You Change or Replace an EIN?

In some cases, a business may need a new EIN after a major structural change. Simple updates such as a name change or address change do not always require a new number, but major events like a merger, conversion, or change in tax classification may.

Because the rules vary by situation, it is important to review the IRS requirements before assuming your existing EIN can stay in place.

Why Getting the EIN Right Matters

An EIN is more than a formality. It affects how your business interacts with the IRS, your bank, vendors, payroll providers, and state agencies. Getting it right early helps you avoid delays in launching operations and reduces administrative cleanup later.

That is especially important if you are setting up an LLC or corporation for the first time. The EIN is one of the key details that connects your formation paperwork, tax records, and banking setup.

How Zenind Helps

Zenind helps founders simplify the early stages of business formation by supporting the administrative steps that follow state filing. If you are forming an LLC or corporation and want help organizing the EIN process alongside other setup tasks, Zenind can help you move from filing to launch with fewer headaches.

For new business owners, that means less time sorting through IRS instructions and more time focusing on operations, banking, and getting customers.

Final Thoughts

If you are forming an LLC or corporation, an EIN is often one of the first essentials you should secure. It supports tax compliance, banking, hiring, and everyday business operations.

The main goal is simple: make sure your EIN application matches your formation records, use the correct filing method for your situation, and apply at the right time. With a clear process and the right support, getting an EIN is a manageable step in building a compliant business.