Getting an EIN for Your Maine LLC

An Employer Identification Number is a nine-digit number the IRS assigns to identify a business for federal tax purposes. It's often called a Federal Tax ID or FEIN. Think of it as a Social Security number for your company — the identifier that ties your Maine LLC to its federal tax record.

The EIN is a federal matter. Maine doesn't issue it, and it has nothing to do with the Certificate of Formation you file with the Secretary of State. Once your LLC exists at the state level, the EIN is the next building block that lets the company function financially.

Why it matters in practice

• Banking: Almost every bank requires an EIN to open a business account for an LLC. Since keeping business and personal finances separate is essential to protecting your liability shield, the EIN is effectively a prerequisite for operating properly.
• Taxes: Multi-member LLCs file partnership returns under the EIN. LLCs that elect corporate taxation use it too.
• Hiring: If you'll have employees, you need an EIN for payroll, withholding, and employment tax filings.
• Vendors and clients: Some will ask for your EIN on a W-9 rather than your Social Security number, which keeps your SSN out of circulation.

Not every LLC is legally required to have an EIN, but most end up needing one for practical reasons. Here's how to tell where you stand.

You definitely need an EIN if

• Your LLC has more than one member — multi-member LLCs are taxed as partnerships by default and must have an EIN to file
• You hire employees
• You've elected S-corp or C-corp taxation for the LLC
• You're required to file certain federal excise or employment tax returns

You technically may not need one, but should get one anyway, if

You're a single-member LLC with no employees. In that case, the IRS lets you use your own Social Security number for federal income tax, since the LLC is a disregarded entity. But most single-member owners get an EIN regardless, because:

• Banks generally require it to open a business account
• It keeps your SSN off W-9s, invoices, and vendor paperwork
• It's ready if you later add members or hire

Given that it's free and takes minutes, there's little reason for even a solo Maine LLC to skip it.

The IRS offers several ways to apply, and for most people the online route is fastest and simplest. Whatever you do, don't pay a third party a fee just to obtain the number — the IRS issues it for free.

Online (the usual route)

Apply through the IRS EIN Assistant at IRS.gov. The online application:

• Takes about ten minutes to complete
• Issues the EIN immediately at the end — you can download and print the confirmation and use the number the same day
• Is available during the IRS's posted hours (it isn't a 24/7 system)
• Requires the responsible party to have a valid U.S. Social Security number or ITIN

By fax or mail

If you can't use the online tool — most commonly because the responsible party doesn't have an SSN or ITIN — you apply on Form SS-4. Fax applications are typically processed within a few business days; mailed applications take considerably longer. Non-U.S. applicants generally use this route.

What you'll need on hand

• Your LLC's exact legal name as filed with Maine
• The LLC's mailing address
• The name and SSN/ITIN of the responsible party (usually a member or manager)
• The number of members and your expected tax classification

Order matters here, and getting it slightly wrong causes avoidable headaches.

Form the LLC first

As a rule, wait until your Maine LLC is formed — that is, until the Certificate of Formation is on file — before you apply for the EIN. The EIN application asks for your exact legal entity name, and you want that to match the name Maine actually approved. If you apply before formation and the state ends up requiring a name tweak (because your first choice wasn't distinguishable), your EIN and your state record won't line up.

Then bank, then operate

The natural sequence is: file the Certificate of Formation, receive your approved formation document, apply for the EIN, then open your business bank account with both documents in hand. Most banks want to see your formation document and your EIN confirmation together.

One EIN per entity

Your LLC gets one EIN, and it stays with the company for life. You don't get a new one each year, and you generally don't need a new one unless the entity's structure fundamentally changes (for example, certain conversions or ownership changes). Keep the confirmation letter — the IRS calls it the CP 575 — somewhere safe, because banks and lenders sometimes ask for it.

A few recurring errors trip up new LLC owners. None are hard to avoid once you know them.

Paying for a free service

The most common one: paying a company a fee to "get your EIN." The IRS provides EINs at no cost. If a service bundles it into a broader package that's your call, but never pay a standalone charge for the number itself.

Applying before the LLC exists

Getting the EIN before your Certificate of Formation is approved risks a name mismatch if Maine requires a change. Form first, then apply.

Using the wrong responsible party

The "responsible party" on the application should be someone with real control over the LLC — typically a member or manager — not a nominee or a service. The IRS expects this to be an actual person who controls the entity.

Losing the confirmation

Save the EIN confirmation letter immediately. Retrieving a lost EIN later means contacting the IRS, which is slower than just filing it away when you first receive it.

Where Mainstay Filing fits

When you form your Maine LLC with us, we can help you get the EIN squared away as part of getting the company operational — so the formation, the tax ID, and your registered agent are handled in one coordinated process rather than three disconnected errands. The EIN itself remains free from the IRS; what we provide is the coordination so nothing is done out of order.