What an EIN is, who needs one, how to get one free from the IRS, what information to prepare, and the mistakes and scams to avoid.
Quick answer: An Employer Identification Number (EIN) is a federal tax ID for a U.S. business. Corporations, partnerships, most LLCs and businesses with employees generally need one. You can apply free through the IRS, and U.S.-based applicants usually receive it right away online. You should not have to pay anyone for the number itself.
An EIN is one of the first things many new business owners need, as banks and tax forms may ask for it. The process is simple if you prepare in advance, but paid websites can look official and charge for something that is free. This guide covers who needs one and how to apply. It is general information, so check the IRS website or a tax professional for your situation.
In this article
- What Is an EIN?
- Who Needs an EIN?
- Why Might a Sole Proprietor Want One?
- What Do You Need Before Applying?
- How Do You Apply?
- What Happens After You Get It?
- When Do You Need a New EIN?
- Common Mistakes and Scams
- Frequently Asked Questions
- Final Thoughts
What Is an EIN?
An EIN is a nine-digit number issued by the IRS to identify a business for federal tax purposes. It is sometimes called a federal tax ID number. In many business settings, it works in a similar way to a Social Security number for a person.
An EIN does not create your business. You still have to form your LLC or corporation with your state, and you may need separate state tax accounts and licenses as well.
Who Needs an EIN?
| Business type | EIN needed? | Notes |
|---|---|---|
| Corporation | Yes | Required for tax filing |
| Partnership | Yes | Required for tax filing |
| Multi-member LLC | Yes | Generally treated as a partnership or corporation |
| Single-member LLC | Depends | Required with employees or certain taxes; optional in some other cases |
| Sole proprietor with no employees | Often optional | Can usually use a Social Security number if no other requirement applies |
| Business with employees | Yes | Needed for employment taxes |
Trusts, estates, nonprofit organizations and certain other entities can also need EINs, along with businesses that file excise taxes or keep certain retirement plans.
Why Might a Sole Proprietor Want One?
- Privacy: you can give clients an EIN instead of your Social Security number.
- Identity theft protection: fewer people have your personal number.
- Bank accounts: some banks want an EIN for a business account.
- Professional image: it can help you look like an independent business.
- Future growth: you may need one anyway if you hire staff.
Amira is a freelance designer working alone. She does not strictly need an EIN, but three new clients want tax details before paying her. She gets one for free, then uses it on her W-9 forms. Her clients have what they need, and her Social Security number is no longer sitting in their files.
What Do You Need Before Applying?
- Legal business name: exactly as registered, and any trade name.
- Business address: where you receive mail.
- Entity type: such as a sole proprietor, LLC or corporation.
- Responsible party: the individual who controls or manages the business and its funds, with their SSN or ITIN.
- Start date and reason for applying: such as starting a new business.
- Expected employees: if you plan to hire soon.
Download IRS Form SS-4 and complete it as a worksheet first. The online session cannot be saved, and it times out after 15 minutes of inactivity, so preparation really helps.
How Do You Apply?
| Method | Who can use it | Typical timing |
|---|---|---|
| Online | U.S.-based applicants with a valid SSN or ITIN | Immediately |
| Fax | Most applicants, using Form SS-4 | About 4 business days |
| Most applicants, using Form SS-4 | About 4 weeks | |
| Phone | Applicants outside the U.S. | During the call, if complete |
Online steps
- Go directly to the official IRS.gov EIN page.
- Start the online application during its service hours.
- Select your entity type and reason for applying.
- Enter the responsible party and business details.
- Review your answers carefully.
- Download and save your confirmation notice at once.
Save your EIN confirmation notice as a PDF in a secure folder, and keep a printed copy with your business records. Banks and accountants may ask for it years later, and it saves you a call to the IRS.
What Happens After You Get It?
- Open a business bank account, if needed.
- Register for state and local taxes where required.
- Set up payroll, if you have employees.
- Wait up to two weeks before using a new online EIN for e-filing, electronic deposits or TIN matching. You can often use it for bank accounts and paper filing sooner.
- Report changes of responsible party or address on Form 8822-B within 60 days.
When Do You Need a New EIN?
The rules depend on your structure and what has changed. A new EIN is generally needed if a sole proprietor incorporates or a partnership ends and a new one begins. A simple change of name or address usually does not call for one. Check the IRS guidance before you apply, as duplicate numbers can create confusion.
Dan runs a sole proprietorship with its own EIN, then forms a corporation as he grows. The corporation is a new legal entity, so it generally needs its own EIN. If he had only moved to a new office, he would keep his number and report the address change instead.
Common Mistakes and Scams
- Paying for a free service: paid sites may look official. Check for the IRS.gov address.
- Applying too early: form your LLC or corporation first, as the IRS advises.
- Wrong entity type: this can cause tax filing issues later.
- Multiple applications: you might get duplicate numbers.
- Using a nominee: the responsible party must be the appropriate real person, not simply a helper.
- Losing the letter: save your confirmation at the moment you receive it.
If you are about to apply, fill out Form SS-4 as a draft and find your legal entity name and formation date. You will then be able to finish the online application in one sitting.
Frequently Asked Questions
Is an EIN free?
Yes. Applying directly with the IRS is free.
How long does it take to get an EIN?
The online route is usually immediate, fax takes about four business days, and mail takes roughly four weeks.
Can a foreign owner get an EIN?
Yes, although applicants outside the U.S. typically use phone, fax or mail rather than the online service.
Does an LLC need an EIN?
Multi-member LLCs generally do. Single-member LLCs need one in some situations, particularly if they have employees.
What if I lose my EIN?
Check your confirmation letter, past tax returns or bank records. You can also contact the IRS Business and Specialty Tax Line.
Final Thoughts
- An EIN is a free federal tax ID for your business.
- Many sole proprietors do not need one but may still benefit from it.
- Use only IRS.gov, and prepare your details in advance.
- Save the confirmation, and report any changes on time.
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Sources: Wolters Kluwer: How to get an EIN · Nolo: When a sole proprietor needs an EIN