Do I need an EIN as a sole proprietor?

Most sole proprietors with no employees do not need an EIN. Here is when you must have one, why many get one anyway, and how to apply free.

An EIN is a nine-digit number that the IRS gives to a business. It looks like 12-3456789. You can think of it as a Social Security number for a business.

If you work for yourself with no employees, you usually do not need one. Your Social Security number (SSN) works for your tax return. But an EIN is free and quick to get, and many freelancers get one in their first year self-employed so that they do not have to give their SSN to every client.

The short version

A sole proprietor with no employees usually does not need an EIN.
You need one if you hire employees, have a qualified retirement plan, or must file certain tax returns such as employment or excise returns (IRS, Schedule C instructions).
On a Form W-9, a sole proprietor with an EIN may give either the SSN or the EIN (IRS, Form W-9).
An EIN from the IRS is free. You never have to pay a fee for one (IRS).
An EIN does not change how you pay tax.

Words to know

Sole proprietor: one person who owns a business that is not a company. You and the business are the same for tax.
EIN: employer identification number. The IRS uses it to identify a business.
Form W-9: a form a client asks you to fill in. It gives them your name and tax number so they can report what they paid you.
Responsible party: the person who owns or controls the business. For a sole proprietor, that is you.

When you must have one

The Schedule C instructions say you need an EIN only if you have a qualified retirement plan, or must file employment, excise, alcohol, tobacco or firearms returns, or pay gambling winnings (IRS).

For a one-person business, the common triggers are:

you hire an employee,
you set up a qualified retirement plan for the business,
you form a partnership or corporation, or
your sole proprietorship incorporates or becomes a partnership. Then it needs a new EIN (IRS, Form SS-4 instructions).

A sole proprietor usually needs only one EIN, even with more than one business or trade name (IRS).

What an EIN does not do

An EIN does not make you a company. It does not create an LLC or register a business name. You still file Form 1040 with Schedule C, and your profit is still taxed to you. You still pay self-employment tax the same way.

Why many people get one anyway

The main reason is the W-9. Clients ask for one before they pay you. The W-9 says a sole proprietor with an EIN may enter either the SSN or the EIN (IRS). So with an EIN, your SSN stays out of client files.

The IRS also says it encourages sole proprietors to use the SSN. Both are allowed. The choice is yours. On line 1 of the W-9, write your own name as it is on your tax return. A business name goes on line 2. For more, see Form W-9 explained.

Some banks also ask for an EIN to open a business account.

How to apply

Apply on IRS.gov, not on a site that charges a fee (IRS).

Do the application in one session. It stops after 15 minutes with no activity.
If it is approved, you get the EIN at once. Print the confirmation letter.
The tool is open Monday to Friday, 6 a.m. to 1 a.m. Eastern; Saturday, 6 a.m. to 9 p.m.; and Sunday, 6 p.m. to midnight.
You can get only one EIN for each responsible party each day.

An example

Sam is a freelance photographer. (He is an example, not a real person.) A new agency asks for a W-9 before it pays his first invoice. Sam does not want his SSN in the agency’s shared inbox.

He applies for an EIN on IRS.gov on a Tuesday morning. He enters his own name as the legal name. Ten minutes later he has the number and saves the PDF letter. He puts the EIN on the W-9 and sends it. Nothing about his taxes changes. He still files Schedule C in April.

A Righto tip

Sam also pays second shooters, so he needs W-9s from them too. In Righto, each second shooter is a vendor. In January the contractor payment report shows what he paid each one in the year. You can also ask your own AI agent, such as Claude Code, for that list. See how agents work with Righto.

Common questions

Is an EIN the same as a tax ID number? An EIN is one kind of tax ID number. An SSN is another.

Does an EIN change how I am taxed? No. You still report profit on Schedule C and pay self-employment tax the same way.

Do I need a new EIN if I change my business name? Usually not, for a sole proprietor. You need a new one if the business incorporates or becomes a partnership (IRS).

What to do now

Check if you hire staff, have a retirement plan, or file excise returns. If so, you need an EIN.
If not, decide if you want one to keep your SSN off W-9s.
If yes, apply free on IRS.gov during the open hours.
Save the confirmation letter with your business records.
Use the EIN on new W-9s.

Righto is free, easy to use and needs no account.

Sources

Righto gives general information, not tax or legal advice. Ask a tax professional about your business.