EIN for a Florida Corporation — How to Get Your Federal Tax ID

An Employer Identification Number (EIN) is a nine-digit federal tax identification number issued by the IRS. Think of it as a Social Security number for your business — it identifies the corporation to the federal government for tax and reporting purposes.

Why a corporation always needs an EIN

Unlike a single-member LLC, which can sometimes operate on the owner's Social Security number, a corporation always needs its own EIN. A corporation is a separate taxpaying entity — even an S-corporation, which passes income through to shareholders, files its own federal return and needs its own EIN to do so. There's no version of a corporation that operates on an individual's SSN.

You'll use the EIN to:

• File the corporation's federal tax returns (Form 1120 for a C-corporation, Form 1120-S for an S-corporation)
• Open a corporate bank account — banks require it
• Hire employees and handle payroll tax reporting
• Register for Florida taxes, like sales tax, with the Department of Revenue
• Apply for business licenses and set up merchant or vendor accounts

In short, almost nothing operational happens without the EIN. It's one of the first things to obtain after your Articles of Incorporation are filed.

Timing matters. Apply for the EIN after your corporation is officially formed, not before.

Form the corporation first

The EIN application asks for the corporation's legal name and formation details. If you apply before the Division of Corporations processes your Articles of Incorporation, you risk a mismatch between the EIN record and the state record — which can cause headaches with banks and the IRS later. Wait until your Articles are filed and your corporation appears in the Sunbiz record, then apply.

Apply before you need to transact

Once the corporation exists, get the EIN promptly. You'll need it to open the corporate bank account, and you can't really operate — accepting payments, paying vendors, running payroll — until the account is open. Applying online gets you the number immediately, so this step doesn't have to be a bottleneck if you handle it in the right order.

The IRS offers several ways to apply, and one is faster than the rest.

Online (fastest)

The online EIN Assistant at IRS.gov is the quickest method. You complete the application in a single session — it takes about ten minutes — and the EIN is issued immediately at the end. You can download and print the confirmation and start using the number the same day. The online tool is available during the IRS's posted hours and requires the application to be completed in one sitting; it doesn't save partway through.

To apply online, the "responsible party" — typically an officer of the corporation — needs a valid Social Security number or ITIN. The responsible party is the individual who ultimately controls or manages the corporation.

By fax or mail (Form SS-4)

If you can't or prefer not to apply online, complete IRS Form SS-4 and submit it by fax or mail. Fax responses typically come back within a few business days; mail takes longer, often several weeks. This is also the route for applicants without an SSN or ITIN, who cannot use the online tool.

For applicants without a US SSN or ITIN

If the responsible party doesn't have a Social Security number or ITIN — common for non-US owners of a Florida corporation — you apply using Form SS-4 by fax or mail, leaving the SSN/ITIN field appropriately completed per the IRS instructions. It takes longer than the online route, but it's a well-established path, and you can still get an EIN for a corporation you own from outside the US.

This is worth stating plainly: the IRS never charges for an EIN. Applying directly at IRS.gov costs nothing.

Watch for third-party fees

Some websites and services charge a fee to obtain an EIN "for you." That fee pays for their service of filling out the application — it is not a government cost, and the EIN itself remains free. Some of these sites are designed to look official. The genuine IRS application is at IRS.gov and carries no charge.

If a formation service includes EIN acquisition in a package, that's a convenience they're providing; you're paying for their time, not the number. There's nothing wrong with that if you value the convenience — just know that you can always obtain the EIN yourself for free if you prefer.

Once you have the EIN, a few housekeeping steps keep things clean.

Store it safely

Save the EIN confirmation (the IRS notice, sometimes called the CP 575 for mailed confirmations, or your printed online confirmation) with your corporate records. You'll be asked for the EIN repeatedly — by banks, by your accountant, on tax forms — so keep it accessible but secure.

Use it consistently

Use the EIN, not your personal SSN, on all corporate matters: the bank account, tax filings, vendor forms, and payroll. Keeping the EIN on business paperwork and your SSN off it reinforces the separation between you and the corporation, which supports your liability protection.

Update the IRS if the responsible party changes

If the responsible party for the corporation changes, the IRS asks you to update the record using Form 8822-B. This keeps the IRS's contact for the corporation accurate.

How Mainstay Filing fits in

Mainstay Filing focuses on getting your corporation formed correctly with the Division of Corporations — the step that has to come before the EIN. Because the online EIN application is free and immediate once your corporation exists, many owners simply apply themselves at IRS.gov after formation. If you'd rather not, an EIN can be part of your setup, but either way the number itself is a free federal service you're entitled to.