How to Get an EIN in Ohio

An Employer Identification Number, or EIN, is a nine-digit federal tax identification number assigned by the IRS to business entities. In Ohio, you'll need an EIN if you're hiring employees, forming certain business structures, or filing certain tax returns. This guide walks you through the process of obtaining an EIN, what to expect, and common pitfalls to avoid.

What Is an EIN and Why Do You Need One?

An EIN is your business's federal tax identification number. It works for businesses the way a Social Security number works for individuals. The IRS uses it to track your business income, taxes, and employment records. Think of it as your business's official federal ID.

An EIN is separate from Ohio's state tax ID or any local business license. You'll apply for it directly with the IRS, not with the Ohio Secretary of State or Ohio Department of Taxation. However, both the IRS and Ohio will eventually know about your EIN and tie it to your business records.

When Do You Need an EIN in Ohio?

You must obtain an EIN before you can legally operate in these situations:

• You are hiring employees (required for payroll tax purposes)
• You formed an LLC with multiple members
• You formed a corporation or partnership
• You operate as a sole proprietor but plan to hire employees
• You opened a business bank account (most banks require an EIN)
• You are filing certain tax returns such as Form 1065 (partnership), Form 1120 (corporation), or Form 1120-S (S corporation)
• Your business has a payroll
• You operate a nonprofit organization

If you are a sole proprietor with no employees and no business bank account, you may not be required to have an EIN. However, obtaining one is free and recommended because it protects your personal Social Security number from being used as your business tax ID.

What You'll Need Before Applying

Gather the following information before you start the EIN application. You do not need to have already filed paperwork with the Ohio Secretary of State, but you should know your business structure and have decided on a business name.

For All Businesses

• Your Social Security number (if you are the owner or responsible party)
• Your business name (exactly as it appears on your formation documents or as you plan to register it)
• Your business mailing address
• Your business location address (if different from mailing address)
• Your phone number
• Your business structure (sole proprietorship, LLC, S corporation, C corporation, partnership, nonprofit, etc.)
• The date you expect to start your business or the date you started it
• A description of what your business does

If You Formed an LLC or Corporation

• Your formation date (the date your Articles of Organization or Articles of Incorporation were filed with Ohio Secretary of State)
• Your Ohio Secretary of State reference number (optional, but helpful)

If You Have a Responsible Party Who Is Not You

• The responsible party's Social Security number, address, and phone number
• The responsible party's signature (if applying by mail)

Step-by-Step Instructions for Getting an EIN in Ohio

Step 1: Choose Your Application Method

The IRS offers three ways to apply for an EIN. The fastest and easiest is online. Here are your options:

Online (recommended): Apply at https://www.irs.gov/ein. This is the fastest method. You can file online during business hours (7:00 a.m. to 10:00 p.m. Eastern Time, Monday through Friday, except holidays). If you apply in the morning, you will receive your EIN immediately after you submit your application.

By phone: Call the IRS Business and Specialty Tax Line at 1-800-829-4933. Hours are 7:00 a.m. to 10:00 p.m. Eastern Time, Monday through Friday. The IRS will assign your EIN over the phone and mail you a confirmation letter within two weeks.

By mail: Complete Form SS-4 (Application for Employer Identification Number) and mail it to the IRS. Processing takes 2 to 4 weeks by mail. This method is the slowest but works if you cannot access the internet or prefer a paper trail.

Step 2: Gather Your Information and Start the Application

Whether you choose online, phone, or mail, have all your information ready before you begin. If applying online, you will fill out a form on the IRS website. The form will ask for your name, business name, business structure, address, and expected start date.

If applying by phone, a representative will ask you these questions over the phone. If applying by mail, you will fill out Form SS-4. Do not guess at any information. Your application will be rejected if the information does not match your business records later.

Step 3: Provide Your Business Structure Information

On the application, select the business structure that matches your Ohio entity. For example:

• If you filed Articles of Organization with the Ohio Secretary of State, select "Limited Liability Company" (LLC)
• If you filed Articles of Incorporation, select "Corporation"
• If you have not filed any formation documents yet, select "Sole Proprietorship" (if you are the only owner) or "Partnership" or "LLC" (if you have multiple owners)

The IRS does not need to verify your Ohio formation documents, but the business structure you report to the IRS should match the structure you will file in Ohio. If you plan to form an LLC, you should select LLC. You do not need to have already filed the Articles of Organization with the Ohio Secretary of State before applying for an EIN.

Step 4: Provide Ownership and Responsible Party Information

The IRS will ask who owns and operates the business. For a sole proprietorship, this is you. For an LLC or corporation, you will provide the names and Social Security numbers of the members or officers. If you designate someone else as the "responsible party" (the person the IRS will contact about your EIN), you will need their consent and their Social Security number.

Make sure the names match your identification documents exactly. Misspellings or variations can delay processing.

Step 5: Submit Your Application

If applying online: Review all your information for accuracy, then submit. You will receive your EIN immediately on the screen, and the IRS will email you a confirmation letter within two weeks. Write down your EIN and save the confirmation email.

If applying by phone: The IRS representative will confirm all your information and assign an EIN on the call. Write down the EIN and ask the representative to mail you a written confirmation. The confirmation letter arrives in 1 to 2 weeks.

If applying by mail: Complete Form SS-4, sign it, and mail it to the IRS address listed on the form. The IRS will process your application and mail you a confirmation letter. This typically takes 2 to 4 weeks.

Step 6: Receive Your EIN Confirmation

If you applied online or by phone, you will receive a confirmation letter by mail. If you applied by mail, the confirmation letter is your proof that you have an EIN. Do not proceed to open a business bank account or hire employees until you have received your EIN confirmation. Keep this letter in a safe place. You will need it when you apply for licenses, open a bank account, or file taxes.

Processing Times and What to Expect

Online or phone application: You receive your EIN immediately or within one business day. The IRS will mail you a formal confirmation letter within 2 weeks.

Paper application by mail: Processing takes 2 to 4 weeks. Do not submit duplicate applications or call to check on your status before 4 weeks have passed. Duplicate applications cause delays and confusion.

After you receive your EIN, the IRS has a permanent record of your business. The IRS does not send you a physical card or certificate. Your EIN confirmation letter is your official proof. You will need this letter when you:

• Open a business bank account
• Hire your first employee
• File business tax returns with the IRS
• Apply for Ohio state tax registration
• Apply for business licenses in Ohio

Ohio State Tax Registration After Getting Your EIN

Getting a federal EIN is separate from registering for Ohio state taxes. After you receive your EIN, you should register with the Ohio Department of Taxation if your business has payroll, will have employees, or needs to collect sales tax.

To register with Ohio, you will need your EIN. Register online through the Ohio Department of Taxation website. You will need to provide your business name, EIN, address, and expected gross receipts.

Ohio does not impose a corporate income tax, but businesses do pay the Commercial Activity Tax (CAT) if their gross receipts exceed $6 million in a tax year. CAT is a gross receipts tax of 0.26% (0.0026) on Ohio taxable gross receipts. If your business is below the $6 million threshold, you do not owe CAT for that year, but you may still need to register. Always confirm current thresholds with the Ohio Department of Taxation, as they change annually.

Tips and Common Mistakes to Avoid

Do Apply Online If You Can

The online application is faster and easier than any other method. You receive your EIN immediately, and you can start your business right away. Do not delay by applying by mail unless you have a specific reason to do so.

Do Not Misspell Your Business Name

The name you provide to the IRS must match the name you register with the Ohio Secretary of State. If you apply for an EIN under "John's Landscaping" and then register with Ohio as "John's Landscape Service," you will have records under two different names, which creates confusion and delays. Decide on your business name before you apply for your EIN and stick with it.

Do Not Apply Multiple Times

If you submitted an application by mail and have not heard back after 4 weeks, call the IRS before submitting another application. Do not resubmit your Form SS-4. Duplicate applications cause delays because the IRS will not know which one is correct.

Do Not Use Your Personal Social Security Number as Your Business Tax ID

Some sole proprietors skip getting an EIN and use their personal Social Security number instead. This exposes your personal information and mixes your personal and business taxes. Get an EIN. It is free, quick, and protects your identity.

Do Gather All Information Before You Start

Have all your business information ready before you begin the application. If you apply online and stop halfway through, your application may be lost. Do not start until you can complete the entire application in one session.

Do Save Your Confirmation Letter

When the IRS sends you your EIN confirmation letter, save it in a secure location. Scan or photograph it and store a copy in the cloud. You will need this letter many times over the life of your business. If you lose it, you can request a copy from the IRS, but it is faster to have the original.

What Comes Next After Getting Your EIN

After you have your EIN, your next steps depend on your business structure and whether you have employees.

If you formed an LLC: Register the LLC with the Ohio Secretary of State by filing Articles of Organization (if you have not already done so) at https://www.ohiobusinesscentral.gov/. Filing fee is $99. You also need to appoint and maintain a statutory agent in Ohio.

If you formed a corporation: Register the corporation with the Ohio Secretary of State by filing Articles of Incorporation at https://www.ohiobusinesscentral.gov/. Filing fee is $99.

If you have employees: Register for Ohio payroll withholding and unemployment insurance with the Ohio Department of Job and Family Services. You will need your EIN to complete this registration.

Open a business bank account: Bring your EIN confirmation letter to your bank. The bank will verify your EIN and open an account in your business name. Do not mix personal and business money. Keeping separate bank accounts makes accounting, taxes, and audits much easier.

Obtain business licenses and permits: Depending on your industry and location, you may need licenses from the state or local government. Check with your city or county to see what licenses your business needs. Your EIN confirmation letter will be required for most applications.

Frequently Asked Questions

Can I get an EIN if I have not filed formation documents with Ohio yet?

Yes. You can apply for an EIN before you file your Articles of Organization or Articles of Incorporation. The IRS does not verify your Ohio filings. However, you should be prepared to file your formation documents shortly after you receive your EIN.

How long is an EIN valid?

An EIN is valid for the life of your business unless you close your business or change your business structure. You do not renew an EIN every year. Once you have it, you keep it.

Can I change my business name after I get an EIN?

Yes, but you need to notify the IRS. If you change your business name, file Form 8822-B with the IRS and include your EIN. Keep the same EIN. Do not apply for a new one.

What if the IRS rejects my application?

If your application is rejected, the IRS will explain why by mail. Common reasons include mismatched names, incorrect Social Security numbers, or conflicting business structures. Fix the issue and reapply. If the problem is unclear, call the IRS Business and Specialty Tax Line at 1-800-829-4933.

Legal Disclaimer

This article is informational only and not legal or tax advice. Obtaining an EIN involves federal tax law, which can be complex and varies by business structure. Before you start your business, consult a qualified tax professional or attorney who is licensed in Ohio. A CPA or tax attorney can ensure you choose the right business structure, obtain all required licenses, and file all required documents correctly.

The information in this article reflects the laws and procedures as of 2026. Federal tax law and IRS procedures change frequently. Always verify current requirements by visiting https://www.irs.gov/ and the Ohio Department of Taxation website before taking action.