EIN Guide for a New Jersey Corporation

An Employer Identification Number (EIN) is a nine-digit federal tax ID issued by the IRS. Think of it as a Social Security number for your business — it identifies the corporation to the IRS, banks, and other institutions. It's sometimes called a Federal Tax Identification Number, or FEIN.

Why a corporation always needs one

Unlike a single-member LLC, which can sometimes use the owner's Social Security number, a corporation always needs its own EIN. A corporation is a distinct taxpayer that files its own returns, so it can't operate on an individual's SSN. You'll need the EIN to:

• File the corporation's federal tax return (Form 1120 for a C corporation, Form 1120-S for an S corporation)
• Open a corporate bank account — banks require the EIN and won't open a business account without it
• Hire and pay employees, running payroll and withholding
• Complete New Jersey's NJ-REG business registration, which asks for the EIN
• Apply for business licenses and permits and establish business credit

In short, almost nothing about operating a New Jersey corporation works without the EIN, so it's one of the first things you get after the Certificate of Incorporation is filed.

The best part: an EIN is free directly from the IRS. Be wary of sites that charge for "EIN filing" — the IRS issues the number at no cost.

Apply online (the fast path)

The quickest route is the IRS EIN Assistant at IRS.gov. The online application:

• Takes about ten minutes to complete
• Issues the EIN immediately at the end, so you can use it the same day
• Is available during the IRS's posted hours
• Requires the person applying (the "responsible party") to have a valid U.S. Social Security number or ITIN

You provide the corporation's legal name as filed, its address, the responsible party's information, and basic details about the business. When you finish, you can download the EIN confirmation letter (CP 575) — keep it, because banks and the state will ask for it.

Apply by fax or mail

If you can't or prefer not to apply online, you complete Form SS-4 and submit it by fax or mail. Fax is faster than mail — expect a few business days by fax versus several weeks by mail. This route is also how applicants without an SSN or ITIN obtain an EIN.

Non-U.S. founders can absolutely own a New Jersey corporation and get an EIN — the online tool just isn't available to them, so the path is different.

The process for foreign responsible parties

If the responsible party doesn't have an SSN or ITIN, you can't use the online assistant. Instead:

• Complete Form SS-4 on paper
• Leave the SSN/ITIN field appropriately, following the form's instructions for foreign applicants
• Submit by fax (faster) or mail to the IRS, or in some cases call the IRS international line
• Expect a wait of several business days by fax, longer by mail

This is a well-worn path — plenty of international founders form U.S. corporations. It just requires the paper process and a bit of patience. The EIN you receive is identical to one obtained online; only the application route differs.

A note on the responsible party

The IRS requires a real person as the "responsible party" — someone who controls or manages the corporation — not another entity. For most corporations that's a principal officer. Provide accurate responsible-party information, because the IRS uses it to keep the corporation's records current.

The EIN is federal, but it's woven into your New Jersey obligations, so the sequence matters.

Order of operations

1. File your Certificate of Incorporation with the Division of Revenue and Enterprise Services to create the corporation.
2. Get the EIN from the IRS once the corporation legally exists.
3. Complete NJ-REG — New Jersey's business registration for tax and employer purposes, due within 60 days of formation. NJ-REG asks for your EIN, which is why you get the EIN first.

Why NJ-REG needs the EIN

New Jersey uses your federal EIN to tie your corporation to its state tax accounts — Corporation Business Tax, sales tax, employer withholding. Registering through NJ-REG with the correct EIN keeps your federal and state records aligned. Getting these numbers matched up front avoids headaches when you file taxes or run payroll later.

A few avoidable errors cause real friction, so it's worth knowing them.

What trips people up

• Paying for an EIN. It's free from the IRS. Third-party sites that charge a fee for the number itself are selling you something you can get for nothing.
• Applying before the corporation exists. Get the EIN after the Certificate of Incorporation is filed, so the corporation's legal name and existence are settled and match.
• Name mismatches. Apply using the exact legal name on your Certificate of Incorporation. A mismatch between your EIN records, your formation documents, and your bank causes verification problems.
• Losing the confirmation letter. Save the CP 575 EIN confirmation. Banks, NJ-REG, and lenders ask for it, and getting a replacement (a 147C letter) means calling the IRS.
• Wrong responsible party. List a real controlling person, and keep the information current with the IRS if it changes.

Handled correctly, the EIN is a ten-minute task that unlocks banking, payroll, and your New Jersey tax registration. If you'd rather not deal with the IRS interface, Mainstay Filing can help coordinate obtaining your corporation's EIN as part of getting you set up.