EIN Comparison
EIN vs W-9: The Number vs the Form (2026)
An EIN is a number. A W-9 is a form. You write the EIN onto the W-9 — they are not the same thing. Here is how they connect and which number to use.
Last updated: July 10, 2026
An EIN is not the same as a W-9. An EIN is your tax identification number. A W-9 is an IRS form on which you report a tax ID (either your EIN or SSN) to a business that will pay you, so they can issue a 1099. The W-9 is the paperwork; the EIN is one of the numbers you write on it. Businesses and single-member LLCs can put their EIN on a W-9 instead of an SSN.
Contractors and payers often ask whether an EIN and a W-9 are the same. They are not — one is a number, the other is a form. The EIN gets written onto the W-9, which is what causes the confusion.
This guide separates the number from the form, explains whether to use your EIN or SSN on a W-9, walks through the W-9-to-1099 flow, and covers the privacy benefit of using an EIN. For the tax ID basics, see what is an EIN.
EIN vs W-9: The Number vs the Form
An EIN is a 9-digit tax identification number. A W-9 is an IRS form that collects a tax ID from someone who will be paid. The EIN is data; the W-9 is the container.
| Attribute | EIN | W-9 |
|---|---|---|
| What it is | Tax identification number | IRS information form |
| Format | 9 digits (XX-XXXXXXX) | A one-page document |
| Issued by | IRS | Completed by you, kept by the payer |
| Purpose | Identifies your business for tax | Reports your tax ID to a payer |
| Filed with the IRS? | Assigned by the IRS | No — the payer retains it |
You do not choose between an EIN and a W-9. You put the EIN (or SSN) onto the W-9. See EIN vs SSN for which identifier to use.
Which Number
Do You Put Your EIN or SSN on a W-9?
Put your EIN if your business has one. Single-member LLCs, corporations, and partnerships use the EIN. A sole proprietor without an EIN uses their SSN. The EIN is preferred because it keeps your SSN off the form.
- Corporation or partnership — always use the EIN.
- Single-member LLC — use the EIN if you have one; you may use the SSN, but the EIN protects your privacy. See EIN for sole proprietors for the related sole-prop case.
- Sole proprietor with no EIN — use the SSN, or get an EIN to avoid sharing it.
- Freelancer — an EIN lets you accept W-9 requests without exposing your SSN. See EIN for freelancers.
Match the name on the W-9 to how the IRS has the tax ID registered. A mismatch can trigger backup withholding of 24% on your payments.
How Does the W-9 to 1099 Flow Work?
The W-9 collects your tax ID, and the payer uses it to issue a 1099. The W-9 is the intake form; the 1099 is the report sent to the IRS.
Payer requests a W-9
A business that will pay you $600 or more for services asks you to complete Form W-9 with your name, entity type, and tax ID.
You return the W-9 with your EIN
You fill in your EIN (or SSN), sign, and send it back. The payer keeps it on file — it is not sent to the IRS.
Payer issues a 1099
At year end, the payer uses the W-9 details to issue you a Form 1099 reporting the total they paid, and files that 1099 with the IRS.
IRS matches the 1099 to your return
The IRS matches the 1099 against your tax return. Using a consistent EIN and name across W-9s keeps this matching clean.
The privacy benefit is direct: every payer who holds your W-9 sees the number on it. An EIN exposes your business ID instead of your personal SSN, lowering your identity-theft risk across every client relationship.
Frequently Asked Questions
Do I put my EIN or SSN on a W-9?
Put your EIN if you have one for your business. Single-member LLCs, corporations, and partnerships use the EIN. A sole proprietor without an EIN uses their SSN. Using an EIN instead of your SSN on a W-9 protects your personal identifier, since the W-9 goes to the payer who requested it.
Can an LLC use its EIN on a W-9?
Yes. An LLC with an EIN reports that EIN on a W-9. A single-member LLC can use either its EIN or the owner's SSN, but the EIN is preferred for privacy. On the W-9, check the correct tax classification box (for example, disregarded entity or corporation) and enter the EIN in the taxpayer identification number field.
Is a W-9 a tax ID number?
No. A W-9 is an IRS form, not a number. It is the document a business asks you to complete so they can collect your tax identification number — either your EIN or SSN — and issue you a 1099. The tax ID is the number; the W-9 is the paperwork that reports it.
Why would I use an EIN instead of an SSN on a W-9?
Using an EIN on a W-9 keeps your Social Security number private. Every payer who receives a W-9 sees the number on it. An EIN identifies your business without exposing your personal SSN, reducing your identity-theft risk. This is a common reason freelancers and single-member LLC owners get an EIN.
What happens after I submit a W-9?
After you submit a W-9, the payer keeps it on file and uses the tax ID and name on it to issue you a Form 1099 at year end, reporting what they paid you. The IRS matches the 1099 against your tax return. The W-9 itself is not filed with the IRS; the payer retains it.
Does a W-9 report income to the IRS?
No. The W-9 collects your information but is not sent to the IRS. The payer uses the W-9 details to prepare a Form 1099, which is the document that reports your income to the IRS. Think of the W-9 as the intake form and the 1099 as the report generated from it.
Do I need an EIN to fill out a W-9?
No. You can complete a W-9 with your SSN if you are a sole proprietor without an EIN. However, an EIN is required if you operate as a corporation or partnership, and it is recommended for single-member LLCs and freelancers who want to keep their SSN off the form.
Which name goes on a W-9 with an EIN?
Enter the name that matches the EIN in IRS records. For a single-member LLC, the IRS often ties the EIN to the owner's name, so the W-9 line 1 uses that name with the business name on line 2. Match the W-9 exactly to how the IRS has the EIN registered to avoid backup withholding.
Get an EIN for Your W-9s
Use an EIN instead of your SSN on W-9s. ein.so files yours with the IRS. $49 Standard. $97 Express.
Get My EIN for $49