EIN: How to Get One and Why
The federal tax ID that opens your business bank account, keeps your Social Security number off vendor forms, and ends up on every contract, platform signup, and tax document your business touches.
A business identity can be stolen the same way a personal identity can, and the number that lets it happen is the same number a founder hands out twenty times in her first year of operating. The EIN sits on bank applications, vendor forms, W-9s, payroll setup, wholesale paperwork, and resale certificates. Most founders treat it as a piece of paperwork. The brands that get hit with fraudulent credit lines in their name learn the hard way that it is the most important nine digits in the business.
An EIN, or Employer Identification Number, is a federal tax ID the IRS assigns to a business. It functions the way a Social Security number does for a person, identifying the entity for tax reporting, payroll, and credit purposes. It is free. It takes about 15 minutes to get. And every founder, including a sole proprietor with no employees and no LLC, should have one.
Why a founder needs one even as a sole proprietor
The IRS technically lets a single-member business use the owner’s Social Security number as its tax ID. Most women do this in year one because the IRS does not require otherwise, and most regret it by year two.
Every vendor account, payment processor, wholesale supplier, dropshipper, and software subscription that pays out income asks for a tax ID. When that number is an SSN, it is copied into a database somewhere every time. Each of those databases is a leak waiting to happen. A stolen SSN compromises personal credit, retirement accounts, and tax filings. A stolen EIN compromises a business that can be reincorporated if needed.
An EIN also separates personal from business credit. Business credit bureaus like Dun & Bradstreet, Experian Business, and Equifax Business track payment history against the EIN, not the SSN. A founder building a credit file that her business can use later for inventory financing, net-30 terms with manufacturers, or a line of credit needs the EIN tied to that history from day one.
The list of things that require an EIN once a business starts taking itself seriously is long: a business bank account at almost every US bank, hiring any W-2 employee, issuing 1099-NECs to contractors, setting up payroll through Gusto or ADP, applying for state business licenses, opening wholesale accounts with most distributors, applying for SBA loans, electing S-corp tax treatment, and onboarding to most retail platforms.
How to get one
The application lives at irs.gov/ein. It is free. The online application is open Monday through Friday, 7 a.m. to 10 p.m. Eastern, and the EIN is issued on the confirmation screen within minutes of submitting.
The responsible party (the person the IRS holds accountable for the entity’s tax obligations) needs a valid Social Security number or ITIN to use the online form. For a single-member LLC, that is the owner. For a multi-member LLC, it is one named managing member.
Before opening the application, have these in front of you:
- The legal business name, exactly as filed with the state if there is an LLC or corporation
- The formation date and state
- The responsible party’s legal name and SSN or ITIN
- The mailing address for the business
The online flow takes about 15 minutes. The EIN appears on the confirmation page at the end. Save the page as a PDF immediately, because the IRS does not email the number, and retrieving a lost EIN means a phone call to the IRS Business and Specialty Tax Line. The same page offers a CP 575 confirmation letter download, which is what most banks ask to see at account opening.
If the responsible party does not have an SSN or ITIN, the online application is unavailable, and the application has to be filed on paper:
- Fax: Complete Form SS-4 and fax it to the IRS. Turnaround is roughly 4 business days.
- Mail: Same form, mailed to the IRS. Turnaround is roughly 4 weeks.
- Phone (international applicants only): Call +1 267-941-1099, Monday through Friday, 6 a.m. to 11 p.m. Eastern, with a completed SS-4 in hand. The agent issues the EIN over the phone.
What an EIN does not do
An EIN is a tax ID. That is the entire scope of it. It does not form an LLC. It does not register a business with the state. It does not give the owner legal liability protection. It does not open a business bank account on its own. A founder with an EIN and no LLC is still a sole proprietor, with personal assets fully exposed to business liability.
Getting an EIN before forming an LLC is fine for a sole proprietorship. Getting an EIN and assuming it replaces an LLC is the kind of mistake that ends with a personal home being part of a business lawsuit settlement.
When to share it
The EIN is a legitimate request on:
- W-9 forms from clients who will pay the business more than $600 in a tax year
- Business bank account applications
- Resale certificates and sales tax registrations
- Wholesale account applications and credit applications with manufacturers
- Payroll providers and benefits administrators
- Loan and credit applications
- Net-terms applications with suppliers
These are the contexts where sharing it is the point of the transaction.
When not to share it
Treat the EIN the way a personal SSN gets treated. Do not post it publicly on a website, in a social media bio, or on a press kit. Do not include it in cold inbound emails from companies that cannot explain why they need it. Do not give it to anyone whose business reason for asking is unclear.
A leaked EIN is the gateway to business identity theft, which means fraudulent credit accounts opened in the company’s name, fake tax returns filed for refund fraud, and synthetic vendor accounts that take inventory on net-30 terms and disappear. Cleaning it up costs months of disputes with bureaus, lenders, and the IRS.
The strongest defensive move a founder can make after receiving an EIN is to freeze her business credit at the three major bureaus immediately: Dun & Bradstreet, Experian Business, and Equifax Business. The freeze is free, takes about an hour total across the three sites, and stops fraudulent applications from being approved against the EIN. A founder who never plans to apply for business credit still benefits, because the freeze closes the most common attack vector before any history accumulates.
Common mistakes
Treating the EIN as proof of an LLC. A registered business entity is a separate filing with the state. The EIN is a tax ID for the entity that already exists, or for a sole proprietorship that has no entity at all. The two are unrelated paperwork, and the EIN does nothing for liability.
Sharing the number publicly. Some founders list their EIN on their website footer or press materials, which is functionally identical to publishing a Social Security number. Once it is indexed by Google, it is in the wild for good.
Skipping the EIN as a sole proprietor. Operating under an SSN means handing it out at every vendor relationship and never building a separate business credit file. The cost of an EIN is zero. The cost of not having one accumulates until it becomes a real problem.
Paying a third party for it. LegalZoom, ZenBusiness, Incfile, and dozens of smaller services charge between $75 and $300 for what the IRS does for free in 15 minutes. None of them have access the founder does not. The fee is for filling out the form, nothing else.
Frequently asked questions
Does an EIN expire?
No. Once the IRS issues an EIN, it is permanent. The number stays attached to the business entity for the life of the business, and it is never reassigned to another business after the entity dissolves.
Do I need a new EIN if my business changes?
Sometimes. A change in entity type (sole proprietorship to LLC, LLC to corporation, partnership to single-member LLC) usually requires a new EIN. A change in business name or address does not. The IRS publishes a full chart of triggering events on its website.
Can I get an EIN before forming an LLC?
Yes. A sole proprietor can get an EIN at any time and should. When the business later forms an LLC, the LLC will need its own EIN, because the LLC is a different legal entity than the sole proprietorship.
What is the difference between an EIN and a state tax ID?
The EIN is federal and used for IRS reporting. A state tax ID is separate, issued by the state’s department of revenue, and is what a business uses to collect sales tax or register as an employer at the state level. Most states require both.
Can someone steal my EIN?
Yes. Business identity theft using a leaked EIN is a real and growing category of fraud. Freezing business credit at Dun & Bradstreet, Experian Business, and Equifax Business immediately after issuance is the strongest preventive step a founder can take.
Sources
- IRS, “Apply for an Employer Identification Number (EIN) Online,” irs.gov. Primary source for the online application process and eligibility.
- IRS, “Do You Need an EIN?” irs.gov. Official guidance on who is required to obtain an EIN.
- IRS, “Form SS-4, Application for Employer Identification Number,” irs.gov. Paper and fax application form for non-US applicants and those without an SSN or ITIN.
- IRS, “Responsible Parties and Nominees,” irs.gov. Definition of the responsible party and requirements for the application.
- IRS, “Identity Theft Information for Businesses,” irs.gov. Overview of business identity theft and recovery procedures.
- Dun & Bradstreet, “Business Credit Freeze,” dnb.com. Official guidance on freezing a business credit file with D&B.