How to Get an EIN in Ohio (2026)

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

An EIN is $0 / free from the IRS, which is the only issuer - never pay a third party. For an Ohio business, apply online through the IRS EIN Assistant (available weekdays 7 a.m. to 10 p.m. ET) and receive the number immediately, or file Form SS-4 by fax or mail. The federal EIN is separate from Ohio tax registration through the Ohio Business Gateway.

What an EIN Is and Who Needs One

An Employer Identification Number (EIN), also called a Federal Tax Identification Number, is a unique nine-digit number the IRS assigns to identify a business for federal tax purposes. It functions like a Social Security number does for an individual, but for an entity. The EIN is a federal identifier; it is not issued by the State of Ohio and is the same whether your business operates in Ohio or anywhere else in the country.

The most important fact about an EIN is that it is free and issued only by the IRS. Many commercial websites advertise paid "EIN filing" services - you never need to pay anyone, because the IRS provides the number at no cost. Under the IRS rules, you must obtain an EIN if any of the following apply:

• You hire employees and must report payroll taxes;
• You operate as a corporation or partnership;
• Your business has a multi-member LLC structure (taxed as a partnership by default);
• You file excise, employment, or certain other federal tax returns;
• You have a Keogh or certain retirement plans.

Even when it is not strictly required - for example, a solo single-member LLC with no employees - most banks require an EIN to open a business account, and it keeps your SSN off vendor and client paperwork. For the national explainer, see how to get an EIN and the glossary.

How to Apply for an EIN (Step by Step)

The EIN application is a federal process, so it is identical whether the business is in Ohio or another state. There are three main methods, with different processing times.

Method 1: Apply online (recommended, instant)

The fastest route is the IRS online EIN Assistant, available Monday through Friday, 7 a.m. to 10 p.m. Eastern Time. Go to the IRS "Apply for an EIN Online" page, answer the questions about your entity and responsible party, and submit. If the application is complete and valid, the IRS issues the EIN immediately, and you can download the confirmation letter. The session cannot be saved, so gather your information first, and remember that only one EIN is issued per responsible party per day.

Method 2: Apply by fax or mail (Form SS-4)

If you prefer not to use the online tool, complete Form SS-4, Application for Employer Identification Number, and submit it to the IRS by fax or mail. Faxed applications are generally processed in about four business days when you provide a return fax number; mailed applications can take several weeks. Check the IRS "Where to File Form SS-4" page for the correct fax number and address.

Method 3: Apply by phone (international applicants)

Applicants who have no legal residence or principal place of business in the U.S. and no SSN or ITIN can obtain an EIN by calling the IRS at 267-941-1099 (not toll-free). If your responsible party lacks a U.S. taxpayer number, see what is an ITIN.

The Responsible Party and One-Per-Day Rule

Every EIN application must name a responsible party - the individual who ultimately owns or controls the entity or exercises effective control over its funds and assets. For a sole proprietorship it is the owner; for a partnership, a general partner; for a corporation, a principal officer; and for an LLC, a member. Except for government entities, the responsible party must be an individual (a natural person), not another entity, and must have their own SSN, ITIN, or existing EIN.

The IRS enforces a strict limit of one EIN per responsible party per day, across all application methods. This prevents a single person from obtaining many numbers at once and applies whether you file online, by fax, or by mail. If you are setting up several businesses, plan to apply on separate days for each entity in which you are the responsible party. Keep the EIN confirmation letter with your permanent records; an EIN is never reused or reassigned.

Ohio Registration Is Separate From the EIN

A common mistake is assuming the federal EIN also registers you with Ohio. It does not. After you obtain the EIN, you must separately register the business with the State of Ohio for the tax accounts that apply to it. Ohio centralizes most business tax registration and filing through the Ohio Business Gateway, working with the Ohio Department of Taxation.

Which accounts you need depends on your activity. If you sell taxable goods or certain services, you register for Ohio sales tax and obtain a vendor's license. If you have employees, you register for employer withholding. Ohio also has a Commercial Activity Tax (CAT) on taxable gross receipts; recent law changes raised the exclusion so that businesses with taxable gross receipts at or below the current threshold (generally $6 million as of 2025) do not owe or register for the CAT - confirm the current threshold with the Department of Taxation. You will typically provide your federal EIN during Ohio registration, which is why the two steps are related but distinct: the EIN identifies you to the IRS, while Ohio registration identifies you to the state. Business formation with the registered agent and Articles is filed with the Ohio Secretary of State - see how to form an LLC, business licenses, business tax, and S-corp vs LLC.

When an Ohio Sole Proprietor Needs an EIN

Sole proprietors are the group most often unsure whether they need an EIN. A sole proprietor with no employees can generally use their own Social Security number for federal tax purposes and is not required to obtain an EIN. However, a sole proprietor must get one if they hire employees, or if they file excise tax returns or have certain retirement (Keogh) plans.

Even when it is optional, getting an EIN is usually the better choice. Banks typically require an EIN to open a business checking account, clients issuing Form 1099 can use the EIN instead of your SSN, and it creates a cleaner separation between you and the business. If you later form an LLC or corporation, that new entity will need its own EIN - you cannot carry over a sole-proprietor EIN. When you are ready to close a business, review how to dissolve an LLC, and note that an EIN itself is never canceled, though the IRS can close the associated business account.

Common Issues and Tips for Ohio Applicants

A few practical points prevent most EIN delays and mistakes for Ohio businesses:

• Apply only through the IRS. The online EIN Assistant and Form SS-4 are free. Websites that charge a fee are third-party middlemen, not the IRS, and offer nothing you cannot do yourself at no cost.
• Match the legal name exactly. Use the exact legal name of the entity as it appears on your Ohio Secretary of State filing. A mismatch between the EIN record and your state filing can cause problems opening bank accounts and filing returns.
• Foreign responsible party. If the responsible party has no SSN or ITIN, you cannot use the online tool; apply by fax or mail with "Foreign" in the SSN/ITIN field, or by phone as an international applicant.
• Third-party designee. If an accountant or attorney applies for you, they must be named as a third-party designee on Form SS-4, which authorizes them only to receive the EIN.
• Lost EIN. If you misplace the number, find it on a prior tax return or IRS notice, or call the IRS Business & Specialty Tax Line. The IRS does not reissue a new EIN for a lost one.
• Sequence with the state. Get the federal EIN first, then set up your Ohio Business Gateway accounts so you can enter the EIN on the state registration.

Following this order - confirm you need an EIN, gather your details, apply free with the IRS, then register with Ohio - keeps federal and state obligations aligned from day one.

Frequently Asked Questions

How much does an EIN cost in Ohio?

Nothing. An EIN is free and is issued only by the IRS. Never pay a third-party website to get one for you. The fastest way is the IRS online EIN Assistant, which issues the number immediately at no charge.

Is an EIN the same as an Ohio tax account?

No. The EIN is a federal number from the IRS. Ohio tax registration is separate: you register for the state tax accounts your business needs, such as sales tax or employer withholding, through the Ohio Business Gateway with the Ohio Department of Taxation.

How do I apply for an EIN in Ohio?

Apply directly with the IRS. The fastest method is the online EIN Assistant, available weekdays 7 a.m. to 10 p.m. ET, which issues the EIN immediately. You can also file Form SS-4 by fax or mail, or apply by phone if you are an international applicant.

Does a sole proprietor in Ohio need an EIN?

A sole proprietor needs an EIN if they have employees or file certain excise or pension returns. Otherwise they may use their SSN federally, but most banks require an EIN to open a business account, and it keeps your SSN off vendor paperwork.

How many EINs can I get in one day?

The IRS limits issuance to one EIN per responsible party per day, whether you apply online, by fax, or by mail. If you are forming several entities, plan to apply on separate days for each one where you are the responsible party.

Related

• How to get an EIN (cluster hub)
• How to form an LLC
• What is an ITIN?
• Business tax overview
• What is a DBA?
• How to get an EIN in New Jersey (sibling)
• How to get an EIN in California (sibling)
• Glossary of business terms

Sources

1. IRS - Employer ID Numbers (EINs) (overview; free from the IRS).
2. IRS - How to Apply for an EIN (methods and processing times).
3. IRS - Apply for an EIN Online (EIN Assistant hours; immediate issuance).
4. IRS - Form SS-4, Application for Employer Identification Number (PDF).
5. IRS - Where to File Form SS-4 (fax numbers and mailing addresses).
6. IRS - Do You Need an EIN? (who must obtain one).
7. IRS - Responsible Parties and Nominees (one EIN per responsible party per day).
8. IRS - Lost or Misplaced Your EIN? (how to recover an existing EIN).
9. IRS - Taxpayer Identification Numbers (TIN) (SSN, ITIN, EIN).
10. Ohio Department of Taxation - Commercial Activity Tax (CAT) Registration (state gross-receipts tax).
11. Ohio Department of Taxation - Business Taxes (sales tax, withholding, registration).
12. Ohio.gov - Start a Business in Ohio (Ohio Business Gateway and licensing).
13. Ohio Secretary of State - Businesses (entity formation and filings).
14. Cornell Law School LII - 26 U.S. Code § 6109 (Identifying numbers).

LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. Laws, fees, and procedures change; verify current requirements with the IRS and the Ohio Department of Taxation before acting.