Getting an EIN for Your Colorado LLP

An Employer Identification Number is a nine-digit number the IRS assigns to a business for federal tax purposes. Think of it as a Social Security number for your partnership — a unique identifier the government, banks, and other institutions use to recognize the LLP as its own entity.

Why an LLP always needs one

Unlike a single-member LLC, which can sometimes get by on the owner's Social Security number, a limited liability partnership always needs its own EIN. The reason is structural: an LLP has two or more partners, so it must file a federal partnership return (Form 1065), and that return requires an EIN. There's no version of an LLP that can operate on a partner's personal Social Security number the way a solo business sometimes can.

What you'll use it for

• Filing the partnership's federal return and issuing Schedule K-1s to the partners
• Opening a business bank account — banks require the EIN to open an account in the partnership's name
• Hiring employees and handling payroll tax filings
• Applying for licenses and permits that ask for a federal tax ID
• Establishing credit and entering contracts in the partnership's name

The single most important thing to know about an EIN is that the IRS issues it at no cost. There is no government fee for an EIN, ever. Plenty of websites present themselves as "EIN filing services" and charge for the number — you never need to pay anyone for the EIN itself. A legitimate filing service may include obtaining the EIN as a convenience within a broader package, but the federal number underneath is always free.

The fastest route: apply online

The quickest way to get an EIN is the IRS EIN Assistant at IRS.gov. The online application:

• Is free
• Takes roughly ten to fifteen 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 for the online tool

You'll want your LLP registered with the Colorado Secretary of State first, so the partnership's legal name and details are settled before you apply.

Step 1: Designate a responsible party

The IRS requires a "responsible party" — a person who controls or manages the partnership — to apply. For an LLP, this is typically one of the partners. The responsible party provides their own Social Security number or ITIN to complete the online application.

Step 2: Have the partnership's details ready

You'll need the LLP's exact legal name as registered in Colorado, its principal address, the state and date of formation, the number of partners, and a general description of the partnership's activity.

Step 3: Complete the EIN Assistant

Work through the online questionnaire. Select the partnership entity type, enter the partnership's information, and submit. The system validates as you go.

Step 4: Save the confirmation

At the end, the IRS issues the EIN and generates a confirmation notice (the CP 575 for online applicants). Download and save it — banks and other institutions will ask for it, and getting a replacement later is more of a hassle than keeping the original.

If you can't apply online

Partners without a US Social Security number or ITIN can't use the online tool. In that case you apply by fax or mail using Form SS-4, which takes longer — days by fax, weeks by mail — but reaches the same result.

Paying for the number

The most common and most avoidable mistake is paying a third party a fee for the EIN itself. The IRS charges nothing. If a service's value is genuinely in the convenience of bundling the EIN with other work, that's a choice you can make — but never pay a premium for the number alone.

Applying before the LLP is registered

Apply for the EIN after your LLP is registered with the Colorado Secretary of State, so the legal name on the EIN matches the name on the state record. Getting them out of sync creates friction with banks and on future filings.

Using the wrong entity type

When the EIN Assistant asks for the entity type, select partnership — an LLP files as a partnership by default. Choosing the wrong type can create tax-classification confusion down the road.

Losing the confirmation

Store the EIN confirmation somewhere you can find it. You'll be asked for it repeatedly — opening accounts, filing taxes, applying for licenses. Replacing a lost confirmation letter takes time you'd rather not spend.

Once the EIN is in hand, it becomes the partnership's federal identity for everything financial and tax-related. A few things naturally follow.

Open the business bank account

With the filed Statement of Registration and the EIN confirmation, you can open a bank account in the LLP's name. Keeping partnership money strictly separate from personal money supports the liability shield and makes the year-end partnership return far cleaner.

Set up for taxes and payroll

The EIN is what you'll use on the partnership's Form 1065, on the K-1s issued to partners, and on payroll filings if you hire employees. Your accountant will reference it across all of these.

Keep it consistent

Use the same EIN and the exact registered partnership name consistently across banks, contracts, licenses, and tax filings. Consistency prevents mismatches that slow down account openings and filings later.

Getting an EIN is simple enough that many partnerships handle it themselves directly on the IRS site — and that's completely fine, because the number is free. What Mainstay Filing does is make sure the piece the EIN depends on is right: your Colorado LLP registration, filed correctly, so the legal name and details the IRS attaches to your EIN line up with the state record from the start.

If you'd rather not deal with the IRS application yourself, we can include obtaining the EIN as part of getting your partnership set up, so registration and the federal tax ID are handled together and everything matches. Either way, the federal number itself carries no government fee — we're never charging you for the EIN, only for the convenience of handling the paperwork alongside your registration.