An Employer Identification Number (EIN) is a nine-digit tax identification number the Internal Revenue Service (IRS) assigns to a business so it can be recognized as a separate entity for federal tax purposes. It is formatted as two digits, a hyphen, and seven more digits — for example, 12-3456789.
Think of an EIN as a Social Security number for your company. Where your SSN identifies you as an individual, your EIN identifies your business on tax filings, bank account applications, payroll reports, and financing paperwork. Sole proprietors with no employees can often use their SSN instead, but most businesses that hire staff, form an LLC or corporation, or open a business bank account will need one. Applying is free and can be done directly through the IRS.
Key takeaways
- An EIN is a nine-digit federal tax ID (formatted like 12-3456789) the IRS assigns to identify a business.
- It functions like a Social Security number for your company, separating business identity from personal identity.
- Applying through the IRS is free and can be completed online, by mail, or by fax.
- Most businesses need one to hire employees, form an LLC or corporation, open a business bank account, or apply for financing.
- The number is generally permanent and stays with the business for its lifetime.
How it works
You obtain an EIN by applying with the IRS — online, by mail, or by fax. There is no charge, and the online application typically issues the number immediately. During the application you identify a responsible party (usually an owner or principal officer with control over the business) and provide the entity type, such as sole proprietorship, LLC, partnership, or corporation.
Once assigned, the EIN is permanent and stays with the business. You use it to:
- File federal and state business tax returns
- Open a business bank account
- Run payroll and report employment taxes
- Apply for business licenses and permits
- Complete financing and credit applications
A business generally keeps the same EIN for its lifetime. You would usually only need a new one if the ownership structure changes materially — for instance, converting a sole proprietorship into a corporation.
A quick example with round numbers
Suppose a landscaping company, Sample Yard Co., is set up as an LLC. The owner applies for an EIN and receives 12-3456789 at no cost. Over the year, the numbers look like this:
| Item | Amount |
|---|---|
| Annual revenue reported under the EIN | $500,000 |
| Employees paid through payroll (tied to the EIN) | 4 |
| Business bank account opened using the EIN | 1 |
When Sample Yard Co. later applies for financing, the lender asks for the EIN to pull business records and verify the entity — separate from the owner's personal identity. The single nine-digit number ties the tax return, the payroll, and the bank account together into one recognizable business profile.
Apply with Merchant Fund Express in 60 seconds. Decisions in 2–4 hours.
Why it matters to a business owner
An EIN does more than satisfy the IRS. It helps separate your business and personal finances, which supports cleaner bookkeeping and can protect your personal information — you can often provide an EIN instead of your SSN on vendor and client forms.
For financing, an EIN is usually a baseline requirement. Lenders and funding providers use it to confirm the business exists, review its history, and process applications. If you are pursuing working capital or a merchant cash advance, expect to supply your EIN alongside items like bank statements. Common program parameters in this market include a minimum funding amount around $10,000 and a personal credit score (FICO) of roughly 500 or higher, though specific terms vary by provider and are never guaranteed. Building a business credit profile under your EIN over time can also strengthen future applications.
Related terms
A few terms that often come up alongside EIN:
- SSN (Social Security Number): The individual tax ID for a person; some sole proprietors use it in place of an EIN.
- TIN (Taxpayer Identification Number): The umbrella category for tax IDs; an EIN is one type of TIN.
- Responsible party: The person the IRS lists as controlling the entity on the EIN application.
- Business bank account: An account in the company's name, usually opened with the EIN.
- Business credit profile: The credit history a business builds under its EIN, separate from the owner's personal credit.
Frequently asked questions
Is an EIN the same as a tax ID number?
An EIN is one kind of Taxpayer Identification Number (TIN). "Tax ID" is a broader term that can refer to an EIN, a Social Security number, or other IRS-issued identifiers. When people say a business needs a tax ID, they usually mean an EIN.
Does it cost anything to get an EIN?
No. Applying directly through the IRS is free, and the online application typically issues the number right away. Third-party services may charge a fee to file on your behalf, but the IRS itself does not charge for an EIN.
Do I need an EIN if I'm a sole proprietor?
Not always. A sole proprietor with no employees can often use their Social Security number instead. However, you will generally need an EIN if you hire employees, form an LLC or corporation, open a business bank account, or a lender or client requires one.
Will a lender ask for my EIN when I apply for financing?
Usually, yes. Most lenders and funding providers request the EIN to verify the business and process the application, often alongside items like recent bank statements. Requirements vary by provider, and approval and terms are never guaranteed.
Can my EIN change or does it stay the same?
An EIN is generally permanent and stays with the business for its lifetime. You would typically only need a new one if the business structure changes significantly, such as converting a sole proprietorship into a corporation or changing ownership in certain ways.
