EIN Guide for an Iowa Corporation — What It Is and How to Get One

An Employer Identification Number (EIN) is a nine-digit number the IRS assigns to identify a business for federal tax purposes. Think of it as a Social Security number for your corporation — the identifier you use on tax returns, bank paperwork, and payroll filings.

Why a corporation always needs one

Unlike a single-member LLC, which can sometimes get by on the owner's Social Security number, a corporation always needs its own EIN. That is because a corporation is a separate taxpayer: it files its own federal return regardless of how it is taxed. A C corporation files its own income tax return; an S corporation files an informational return and issues shareholder statements. Either way, the corporation needs a federal tax ID of its own, and that ID is the EIN.

What you use it for

• Filing the corporation's federal and Iowa tax returns
• Opening a corporate bank account — banks require the EIN for a corporation
• Hiring employees and running payroll, including federal and Iowa withholding
• Making the S corporation election on IRS Form 2553
• Registering for Iowa tax accounts, like a sales tax permit, with the Iowa Department of Revenue

The right time to get your EIN is after your Articles of Incorporation are filed and the corporation legally exists, but before you open a bank account or start operating. The order matters.

Why after formation

When you apply, the IRS asks for the corporation's legal name and formation details. Applying before the corporation exists means you would be requesting an EIN for an entity that is not yet on record — which can create a mismatch between the IRS's records and the state's. File the Articles first, let the Secretary of State record the corporation, then apply for the EIN using the exact legal name as it appears on your filing.

Do it before the bank

You will need the EIN to open the corporate bank account, and you want the account open before money starts moving through the business. So the practical sequence is: form the corporation, get the EIN, open the bank account, then begin operations. Slotting the EIN in right after formation keeps everything moving without a bottleneck.

The IRS offers several ways to apply, and one of them is dramatically faster than the rest. For most Iowa corporations, the online application is the way to go.

Online — the fast path

Apply through the IRS EIN Assistant at IRS.gov. The online application is free, takes roughly ten minutes, and issues the EIN immediately at the end. You can download and print the confirmation letter and start using the number the same day. The online tool is available during posted hours and must be completed in one session — it does not save partway through.

Requirements to apply online

• The application is completed by a responsible party — typically an officer or principal of the corporation — who has a valid US Social Security number or ITIN.
• You provide the corporation's exact legal name, its Iowa address, and the type of entity.

If you cannot apply online

Applicants whose responsible party lacks an SSN or ITIN cannot use the online tool. Instead, file Form SS-4 by fax or mail. Fax turnaround is typically a few business days; mail takes several weeks. International applicants can also apply by phone in some cases. These routes work fine — they are just slower than the instant online path.

Getting an EIN is simple, but a handful of avoidable errors cause headaches later. A little care up front prevents them.

Watch out for these

• Paying for an EIN. The IRS issues EINs for free. Any site that charges a fee specifically to "get your EIN" is charging you for a form you can complete yourself in minutes. Filing services may include EIN retrieval as a convenience within a larger package, but the number itself never costs money.
• Applying before the corporation exists. Wait until the Articles of Incorporation are filed and recorded, then apply using the exact legal name. Applying too early risks a name mismatch with the IRS.
• Using a slightly wrong name. Enter the corporation's legal name exactly as it appears on your filing — same words, same designator. A mismatch between the EIN record and your bank or tax filings creates friction.
• Losing the confirmation. Save and back up the EIN confirmation letter (the CP 575). Banks and lenders ask for it, and getting a replacement from the IRS is slower than just keeping the original.
• Confusing the EIN with a state tax number. The EIN is federal. Iowa tax accounts — sales tax, withholding — are separate registrations with the Iowa Department of Revenue, and you use the EIN when you set them up.

The EIN is one piece of getting your corporation operational, and it connects to the steps around it. Understanding where it fits keeps your setup orderly.

What comes before and after

Before the EIN: file the Articles of Incorporation and hold your organizational meeting to adopt bylaws, appoint directors, and elect officers. The responsible party who applies for the EIN is usually one of those officers. After the EIN: open the corporate bank account, register for any Iowa tax accounts you need, and — if it fits your situation — file the S corporation election on Form 2553, which requires the EIN.

Where we fit

When we form your Iowa corporation, we can help make sure the sequence runs smoothly — Articles filed, corporation on record, EIN obtained with the correct legal name, ready for the bank. We do not charge you for the EIN itself, because the IRS does not. What we provide is correct, timely state filings and a clean handoff so your corporation is genuinely ready to operate, not just registered on paper.