How to Apply for an EIN Online for a Single-Member LLC in the U.S.
An Employer Identification Number (EIN) is the federal tax ID the IRS uses to identify a business. For a single-member LLC, getting an EIN is often one of the first practical steps after state formation because banks, payment processors, payroll providers, and many state agencies ask for it. The good news is that the IRS lets eligible applicants get an EIN online for free, and if the application is approved, the number is usually issued immediately.
Start with the official IRS EIN page, not a paid third-party site. The IRS says the online application must be completed in one session, cannot be saved, and times out after 15 minutes of inactivity. This guide explains how to apply online for a U.S. single-member LLC and what to prepare before you begin.
Do You Need an EIN for a Single-Member LLC?
According to the IRS guidance on single-member LLCs, a single-member LLC is usually treated as a disregarded entity for federal income tax purposes unless it elects corporate taxation. That means the owner often reports the business on the owner’s tax return. Even so, many owners still get an EIN because it helps separate personal and business records.
- You generally need an EIN if the LLC will hire employees.
- You need the LLC’s EIN for certain employment tax and excise tax filings.
- You may still want an EIN even with no employees, especially to open a business bank account, apply for licenses, or satisfy a state filing rule.
If your LLC has no employees and no excise tax obligations, the IRS says you may not need an EIN for federal income tax purposes. Still, many single-member LLC owners choose to get one early because it simplifies operations and reduces situations where they would otherwise share a personal SSN.
What to Prepare Before You Start
- Your LLC has already been formed with the state. The IRS says legal entities should be formed through the state before applying for an EIN.
- You know the LLC’s exact legal name, trade name if any, and mailing address.
- You have the responsible party’s SSN or ITIN available for the online application.
- You know when the business started or will start and why you are requesting the EIN.
- You have 15 to 20 uninterrupted minutes to finish the session and save the confirmation notice.
How to Apply for an EIN Online
Form the LLC first
Do not apply before the state accepts your LLC formation. The IRS specifically warns that applying before the legal entity exists can delay processing. Wait until you have the final LLC name and formation details you want tied to the EIN.
Confirm you qualify for the online assistant
The online EIN tool is for businesses whose principal place of business is in the U.S. or U.S. territories. You must be the responsible party in control of the entity, or an authorized representative, and you need the responsible party’s SSN or ITIN. The IRS also says the online tool cannot be used to apply with another EIN, except by government entities.
Gather the exact details the IRS will ask for
Have your LLC name, responsible party name, mailing address, street address, county and state, member count, and start date ready. For a typical single-member LLC, the member count is one. You should also know your reason for applying, such as starting a new business, opening a bank account, or hiring employees.
Start on the official IRS page during open hours
The IRS lists the online assistant hours in Eastern Time as Mon-Fri 6:00 a.m. - 1:00 a.m. the next day, Sat 6:00 a.m. - 9:00 p.m., and Sun 6:00 p.m. - 12:00 a.m. There is no government fee. The IRS also limits applications to one EIN per responsible party per day, so do not start multiple attempts unless you truly need to.
Select LLC and answer the entity questions carefully
Choose LLC as the entity type, then enter that it has one member. Follow the prompts about why you need the EIN and how the business is taxed. If your LLC is using the default single-member LLC treatment, answer based on that status. If you elected or plan to elect corporate taxation, make sure your EIN application matches that choice and any related IRS forms.
Enter responsible party and business information
The responsible party is the person who controls the entity and its funds and assets. In most cases for a single-member LLC, that is the owner. Enter the name and taxpayer ID carefully, then complete the business address and activity questions. Small name or address mismatches can cause avoidable problems later with banking, tax accounts, or notices.
Review, submit, and save the confirmation immediately
Before you submit, reread every screen. Once approved, the IRS issues the EIN online right away. Save the confirmation notice as a PDF and print it for your records because the IRS says you should keep that letter. You can use the EIN immediately for most business needs, but some IRS electronic systems can take up to two weeks to fully recognize a new EIN.
If You Cannot Apply Online
If the online assistant is not available to you, the IRS provides other application methods:
| Method | Typical IRS timing | Best use case |
|---|---|---|
| Online | Immediate if approved | Fastest option for eligible U.S.-based applicants |
| Fax Form SS-4 | About 4 business days | Useful when you cannot use the online assistant |
| Mail Form SS-4 | About 4 weeks | Slowest option, but available if fax is not practical |
| Phone | During the call | International applicants only |
Common Mistakes to Avoid
- Using a paid EIN service. The IRS issues EINs for free.
- Applying before the LLC is officially formed with the state.
- Letting the session sit idle for more than 15 minutes.
- Trying to apply online with another EIN instead of the responsible party’s SSN or ITIN.
- Submitting more than one application in a day for the same responsible party.
- Forgetting to save the confirmation notice after approval.
What to Do After You Receive the EIN
Store the confirmation notice with your formation documents, operating agreement, and banking records. Most owners use the new EIN right away to open a business bank account, onboard payroll, apply for state and local licenses, and complete vendor paperwork. If your tax classification, ownership, or business structure changes later, check the IRS rules before assuming the same EIN still applies. For unusual cases, get advice from a CPA or business attorney.
FAQ
Does a single-member LLC always need an EIN?
No. If the LLC is a disregarded entity with no employees and no excise tax liability, the IRS says it may not need an EIN for federal income tax purposes. However, many owners still obtain one for banking, privacy, licensing, or state tax reasons.
How long does the online EIN application take?
If the application is approved, the EIN is usually issued immediately online. The practical time is often 15 to 20 minutes if you already have your information ready. Just remember that the session cannot be saved and expires after 15 minutes of inactivity.
Can I apply online without an SSN?
For the IRS online assistant, the responsible party needs an SSN or ITIN. If you are not eligible to use the online tool, you may need to apply by fax or mail, or by phone if you are an international applicant.