Do you need an EIN as a sole proprietor?

The legal answer and the sensible answer are different here, which is why this question keeps getting confusing answers.

Legally: as a sole proprietor with no employees, you almost certainly do not need one. Practically: get one anyway. It is free, it takes about ten minutes, and it solves a real problem.

What an EIN actually is

An Employer Identification Number is a nine-digit federal tax ID for a business — the business equivalent of a Social Security number. It is issued by the IRS, it costs nothing, and despite the name you do not need employees to have one.

You may also see it called a Federal Tax Identification Number or FEIN. Same thing.

When you genuinely must have one

You are required to get an EIN if any of these apply:

• You have employees
• Your business is a partnership or a corporation (including an LLC that has elected S-corp treatment)
• You have a multi-member LLC
• You file excise tax returns, or pay certain kinds of withholding
• You have a solo 401(k) — the plan needs its own identifier

Note that a plain single-member LLC with no employees is not on that list. It is a disregarded entity, and it can use your SSN. Adding an S-corp election changes that immediately.

Why to get one regardless

You stop handing out your Social Security number. Every client who has to report a payment to you needs a W-9 from you — that is $2,000 or more from 2026, and it was $600 in 2025 — and that form asks for a taxpayer ID. In practice most clients ask every contractor for a W-9 up front regardless of the amount, so the higher threshold does not reduce how often you hand the number over. Without an EIN, that is your SSN — going to every client, sitting in their accounts payable system, passing through whichever contractor manages their bookkeeping.

Ten clients means ten copies of your SSN in systems you have no control over. An EIN lets you give them a number that is useless for opening credit in your name.

Banks usually want one. Many business accounts require an EIN, and having a separate business account is the single most useful thing you can do for your bookkeeping — and, if you have an LLC, for keeping the liability protection intact.

It looks like a business. Marginal, but real. Some larger clients’ onboarding systems simply expect one.

It costs nothing and closes off future friction. If you later hire someone, form a partnership or elect S-corp status, you will need one anyway.

How to get one

Directly from the IRS website, using the online EIN Assistant. It is free, it takes about ten minutes, and you get the number immediately at the end of the session.

Two things to know:

• The online application is available during US business hours only, and the session times out after about 15 minutes of inactivity — have your details ready before starting.
• Do not pay anyone for this. There is an entire industry of sites charging $50–$300 to fill in a free government form on your behalf. Some are structured to look official. The IRS charges nothing, and the form is genuinely simple.

You will need your legal name, SSN, business address, and a brief description of what the business does.

Using it once you have it

Put the EIN — not your SSN — on every W-9 you give a client. That is the whole point.

Keep using your SSN on your personal Form 1040 and Schedule C. As a sole proprietor, your business income still flows onto your personal return; the EIN does not change how you file or what you owe.

If you already gave clients your SSN before getting an EIN, send them an updated W-9. Most will process it without comment.

One EIN per business, not per client

You need one. Not one per client, not a new one each year.

You would only need an additional EIN if you form a genuinely separate legal entity — incorporating, or forming a partnership. Simply changing what your business does, or renaming it, does not require a new one.

If you have an EIN as a sole proprietor and later form a single-member LLC, the IRS generally wants a new EIN for the LLC, because the entity is legally different even though the tax treatment is the same.

It does not change your tax

Worth being explicit, because this trips people up: an EIN is an identifier, not a tax status. It does not reduce what you owe, does not make you a company, and does not change how self-employment tax is calculated.

You will pay exactly the same as you did before — the calculator below shows what that looks like on your profit.

The short version

If you are freelancing and have clients issuing 1099s, get an EIN. It takes ten minutes, costs nothing, and the reason is simple: your Social Security number should not be circulating through a dozen companies’ accounting systems when a free alternative exists.