Introduction
Almost every business decision that follows incorporation — opening a bank account, hiring a first employee, filing a tax return — depends on having an EIN already in hand. Getting the application right the first time, using the correct method for your situation, avoids weeks of unnecessary delay.
Table of Contents
- The Core Definition
- Who Actually Needs One
- The Four Application Methods
- What You'll Need Before Applying
- Form SS-4, Explained
- Common Mistakes That Cause Delays
- Is It Really Free?
- FAQ
- Conclusion
The Core Definition
An EIN (Employer Identification Number) is a unique, nine-digit number the IRS assigns to identify a business entity for federal tax purposes — functionally similar to how a Social Security Number identifies an individual. It's required for a wide range of standard business activities: opening a business bank account, filing federal tax returns, hiring employees, and applying for business licenses in most jurisdictions.
Who Actually Needs One
Per IRS guidance, an EIN is generally required for:
- Any business with employees
- Businesses operating as a corporation or partnership
- Multi-member LLCs
- Entities filing employment, excise, or alcohol/tobacco/firearms tax returns
- Businesses with a Keogh plan (a specific type of tax-deferred pension plan)
- Certain trusts, estates, and non-profit organizations
A sole proprietor with no employees is a genuine exception — they can often operate using their personal SSN for business tax purposes instead of an EIN. That said, many sole proprietors get an EIN anyway, largely to avoid putting a personal SSN on business documents, invoices, or vendor forms.
The Four Application Methods
| Method | Processing Time | Availability |
|---|---|---|
| Online | Immediate | US-based entities only, 7am–10pm ET, Mon–Fri |
| Fax | ~4 business days | Anyone using Form SS-4 |
| ~4 weeks | Anyone using Form SS-4 | |
| Phone | Immediate (during call) | International applicants only, no US address |
Applying online is genuinely the fastest and most efficient method — the EIN is issued immediately upon successful completion, directly on-screen. It's only available if the business's principal office, business, or legal residence is in the US or a US territory, and the responsible party has a valid SSN, ITIN, or existing EIN.
What You'll Need Before Applying
- Legal name and address of the business, including county and state
- Trade name (DBA), if applicable, separate from the legal name
- Entity type (LLC, corporation, partnership, sole proprietorship, etc.)
- Reason for applying (starting a new business, hiring employees, banking purposes, and so on)
- Responsible party's name and valid SSN, ITIN, or existing EIN
- Date the business started or was acquired
- Principal business activity description
Form SS-4, Explained
Form SS-4, "Application for Employer Identification Number," is the official document used to apply by fax or mail — it's not needed for the online application, which collects the same information through an interactive interface instead. The form asks for the same core details listed above, plus specifics about the "responsible party" — defined by the IRS as the individual who genuinely controls, manages, or directs the entity and the disposition of its funds. This must be a real individual, not another business entity.
Common Mistakes That Cause Delays
- Special characters in the business name — IRS systems only accept alpha characters (A-Z), numbers (0-9), a hyphen (-), and an ampersand (&) in a legal business name; anything else needs adjustment
- Applying online with an ineligible responsible party — if the responsible party already obtained their own EIN via the internet previously, the IRS system may block a new online application for a different entity, requiring an alternate method
- Incomplete or inconsistent legal name — entering the name differently than it appears on formation documents can cause processing issues
- Duplicate applications — applying by more than one method simultaneously (for example, faxing and also calling) risks a duplicate EIN being issued, which creates its own cleanup problem
Is It Really Free?
Yes — applying for an EIN directly through the IRS costs nothing, regardless of which of the four methods is used. This is genuinely worth knowing, since third-party services commonly charge a fee to "help" obtain an EIN — that fee is for their filing-assistance convenience, not for the EIN itself, which the IRS never charges for directly, and which any business owner can apply for themselves at no cost.
FAQ
Businesses with employees, corporations, partnerships, multi-member LLCs, entities that file employment or excise tax returns, and organizations like non-profits or trusts generally need an EIN. A sole proprietor with no employees can often operate using their personal SSN instead, though getting an EIN anyway is common practice, partly to avoid using a personal SSN on business documents.Who actually needs an EIN?
Applying online is the fastest method — the EIN is issued immediately upon successful completion, available 7:00 a.m. to 10:00 p.m. Eastern time, Monday through Friday. Applying by fax takes about 4 business days; applying by mail takes about 4 weeks. International applicants without a US address, office, or legal residence must apply by phone instead.How long does it take to get an EIN?
No — applying for an EIN directly through the IRS is completely free, whether done online, by fax, or by mail. Any service charging a fee to "obtain" an EIN on your behalf is charging for a convenience or filing service, not for the EIN itself, which the IRS never charges for directly.Is there a fee to apply for an EIN?
Form SS-4, "Application for Employer Identification Number," is the official IRS form used to apply for an EIN by fax or mail. It's not required if applying online, since the online application collects the same information through an interactive interface instead.What is Form SS-4?
The responsible party listed on the application must have a valid SSN, Individual Taxpayer Identification Number (ITIN), or an existing EIN of their own. If the responsible party has none of these, the online application generally can't be used, and an alternative application method needs to be used instead.Can I apply for an EIN without a Social Security Number?
IRS systems only accept alpha characters (A-Z), numeric characters (0-9), a hyphen (-), and an ampersand (&) in a business name on an EIN application. Any other character in a business's legal name typically needs to be adjusted or omitted for the application to process correctly.What special characters are allowed in a business's legal name on an EIN application?
Conclusion
An EIN application is genuinely one of the simplest, fastest steps in setting up a new business — free, and instant if done online correctly — but it's also one of the more common places small, avoidable mistakes create weeks of unnecessary delay. Getting the legal name formatting right and confirming the responsible party's eligibility before applying is the difference between an EIN in minutes and one that takes a month.
Setting up a new business and want the compliance basics handled correctly from day one? Get in touch for a free consultation.