How to Apply for an EIN for a Single-Member LLC

A single-member LLC isn't always required to have an Employer Identification Number (EIN), but most owners get one anyway. An EIN protects your Social Security number, makes it easier to open a business bank account, and is required the moment you hire your first employee. Here's how to get one and when you need it.

It depends. A single-member LLC without employees is treated as a disregarded entity by the IRS, which means you can use your Social Security number for federal tax filing instead of an EIN. But if your LLC has employees, files excise tax returns, or handles alcohol, tobacco, or firearms taxes, an EIN is required.

The disregarded entity status is what creates the confusion. Because the IRS treats a single-member LLC like a sole proprietorship for tax purposes, your personal tax return captures the business income — and your Social Security number is technically enough to file. That's different from a multi-member LLC, which always needs an EIN.

Even so, most single-member LLC owners get an EIN right away. The reasons have less to do with tax requirements and more to do with how banks, lenders, and vendors treat your business.

Getting an EIN when you don't technically need one is one of the smarter early moves for a single-member LLC. It keeps your Social Security number off business documents, which reduces your exposure to identity theft. And it signals to banks, vendors, and lenders that your business is a real, separate entity.

Most banks require an EIN to open a business checking account. Without a dedicated business account, you're mixing personal and business finances — and that makes it harder to prove your LLC is independent if you're ever challenged in court. Your personal finances become fair game if a court decides the separation wasn't real.

• Keeps your Social Security number off business tax forms and vendor paperwork
• Required by most banks to open a business checking account
• Needed before you can hire employees or run payroll
• Helps build business credit history separate from your personal credit
• Required if you file excise tax returns or certain other federal returns

The IRS offers 3 ways to apply for an EIN: online, by fax, or by mail. Online is the fastest — you get your EIN immediately after completing the application. The online tool is available Monday through Friday, 7 AM – 10 PM ET, and the application takes about 15 minutes.

Apply online (fastest)

Go to irs.gov/ein and use the IRS online EIN application. You'll need to be a U.S. citizen or resident alien with a valid Taxpayer Identification Number — your Social Security number works. Complete the Form SS-4 questions on screen, confirm your answers, and the IRS issues your EIN immediately. Save or print the confirmation page — the IRS won't send a follow-up email.

Apply by fax

Complete Form SS-4 and fax it to the IRS. Processing takes about 4 business days, and the IRS faxes your EIN back to the number you provide. This option works if you can't use the online tool, but there's no reason to choose it over the online application unless you have a specific need.

Apply by mail

Mail a completed Form SS-4 to the IRS. Processing takes 4 weeks. This is the slowest option and rarely the right choice for a new business that needs to open a bank account or hire employees. Use it only if fax and online aren't available to you.

Before you start the EIN application, your LLC needs to be formed with the state. The IRS won't issue an EIN for a business that doesn't exist yet as a legal entity. Once your Articles of Organization are filed and approved, you're ready to apply.

The IRS application asks for a few specific details. Have these ready before you start — the online session times out, and you'll have to begin again if you don't finish in one sitting.

• Legal name of your LLC as it appears on your Articles of Organization
• Principal business address
• Your name and Social Security number as the responsible party
• Description of your primary business activity
• Reason for applying (new business, hired employees, banking purposes, etc.)