Getting an EIN for a Missouri Limited Liability Partnership

An Employer Identification Number is the nine-digit federal tax ID the IRS hands out to identify a business entity. It functions as the business equivalent of a Social Security number — it identifies your partnership to the IRS, to banks, and to anyone who needs to report payments to the entity.

Why a multi-partner LLP always needs one

A partnership is a separate tax-reporting entity. Even though an LLP is pass-through and doesn't pay federal income tax at the entity level, it still files its own information return — Form 1065 — and issues Schedule K-1s to the partners. You cannot file a partnership return without an EIN. So unlike a single-member LLC, which can sometimes get by on the owner's Social Security number, an LLP needs an EIN from the start because it has at least two partners and files as a partnership.

What you'll use the EIN for

• Filing the partnership's federal return and issuing K-1s
• Opening a business bank account (banks require it)
• Hiring employees and handling payroll tax
• Registering for Missouri state tax accounts, such as sales tax, when applicable
• Providing a tax ID to clients or vendors who need to report payments to the partnership

The IRS issues EINs directly and at no cost. Be wary of third-party sites that charge a fee simply to obtain an EIN — the number itself is always free from the IRS.

The online application

Your quickest option is the IRS EIN Assistant, found at IRS.gov. The online application takes about ten minutes, and the EIN is issued immediately at the end, so you can print the confirmation and start using the number the same day. The online tool is available during the IRS's posted hours and must be completed in a single session — it doesn't save partway through.

What you'll need before you start

• The legal name of the partnership exactly as registered with the Missouri Secretary of State
• The responsible party's information: the IRS requires a responsible party — generally a partner who controls or manages the partnership — along with their Social Security number or ITIN
• The entity type: you'll indicate that the entity is a partnership
• The business address and the reason you're applying (starting a new business)

If the responsible party has no SSN or ITIN

The online tool requires the responsible party to have a U.S. Social Security number or ITIN. If the responsible party has neither, you apply by fax or mail using Form SS-4 instead. That route takes longer than the instant online issuance but reaches the same result.

Who the responsible party is

The IRS wants a single "responsible party" for the partnership — a real person who ultimately owns or controls the entity and directs its funds and assets. For an LLP, that's typically a general partner, not another entity. The responsible party is the natural point of contact the IRS uses, so choose a partner who will remain involved with the partnership rather than someone likely to leave. If the responsible party changes later, the IRS asks you to update it using Form 8822-B so their records stay accurate.

The EIN sits at the center of the practical setup steps that follow registration, and getting it early keeps everything else moving.

Bank account

Almost every bank requires the EIN confirmation to open a business account for the partnership, alongside your filed LLP registration and, often, the partnership agreement. Getting the EIN before you go to the bank avoids a wasted trip. A dedicated partnership account is also important for keeping partnership and personal finances separate — a habit that helps preserve the liability shield.

Federal and state tax accounts

The partnership return (Form 1065) is filed under the EIN, and the K-1s issued to partners reference it. If your LLP will collect Missouri sales tax or have employees, you'll use the EIN when you register those accounts with the Missouri Department of Revenue. Keeping the EIN confirmation somewhere accessible saves time every year at tax season and whenever you set up a new account.

A few recurring issues trip up LLPs specifically, and they're easy to avoid once you know about them.

One EIN per partnership

You need only one EIN for the partnership. Applying multiple times or getting confused between a partner's personal information and the entity's information can create duplicate records. Apply once, using the partnership's registered name and a designated responsible party.

Match the name to the state record

Use the partnership's exact legal name as registered with the Missouri Secretary of State. If the IRS record and the state record don't match, it can cause friction at the bank and confusion on tax filings. Consistency across your registration, EIN, and bank account keeps everything aligned.

Don't pay for the number itself

The EIN is free directly from the IRS. If you use a service to handle the application as part of a broader formation package, that's a convenience you're paying for — but the underlying number never costs anything. Watch out for sites that imply the government charges for the EIN itself.

Keep the confirmation

When the IRS issues the EIN, you get a confirmation notice. Save it. Banks and agencies frequently ask for it, and re-obtaining proof of your EIN later is more of a hassle than simply filing the original notice where you can find it.

When a new EIN is or isn't needed

A partnership generally keeps the same EIN as long as it stays a partnership with a continuing business. You typically don't need a new one just because a partner joins or leaves, or because you change your registered name — those are updates, not a new entity. You would generally need a new EIN if the partnership is genuinely terminated and a new one is formed, or if the business converts to a different entity type such as a corporation. When in doubt about whether an event requires a fresh EIN, check the IRS guidance or ask your accountant before applying for a second number, since duplicates create confusion in the IRS's records.