EIN Guide for an Arkansas Limited Partnership

An Employer Identification Number, or EIN, is a nine-digit federal tax ID the IRS assigns to a business. Think of it as the business equivalent of a Social Security number — it identifies the partnership to the IRS, to banks, and to anyone else who needs to reference the entity for tax purposes.

Why an LP always needs its own EIN

Unlike a single-member LLC, which can sometimes get by on the owner's Social Security number, a limited partnership always needs its own EIN. The reason is structural: an LP by definition has more than one partner, so it files a partnership tax return (IRS Form 1065). A partnership return requires an EIN. There's no solo shortcut, because there's no such thing as a solo LP.

What you'll use the EIN for

• Filing the partnership's Form 1065 and issuing Schedule K-1s to the partners
• Opening the partnership's bank account — banks require an EIN for a partnership
• Hiring employees and running payroll, if the partnership has staff
• Applying for licenses or permits that ask for a federal tax ID

Keeping the EIN on the partnership's paperwork also keeps the general partner's Social Security number off it, which is good practice for privacy.

Timing matters. You want your EIN after the partnership legally exists but before you try to open a bank account or start operating, because those next steps depend on having it.

The right order

• First, form the LP: file and get acceptance of your Certificate of Limited Partnership from the Secretary of State's Business and Commercial Services Division. The entity should exist before you request its federal ID.
• Then, get the EIN: apply once the partnership is on record, so the name and details you give the IRS match your state filing.
• Then, open the bank account: with the filed certificate and the EIN in hand, the bank can set up the partnership's account.

Applying for the EIN before the LP is formed can create mismatches between what the IRS has and what the state has, which causes friction down the line. Get the entity in place first, then request its number.

The IRS issues EINs at no cost, and the fastest route is the online application. Be wary of any site that charges a fee to "get" an EIN; the number itself is always free directly from the IRS.

The online process

• Go to the IRS EIN Assistant at IRS.gov and start the application
• Select "Partnership" as the entity type, since that's how an LP is classified for federal tax purposes
• Provide the partnership's legal name exactly as it appears on your Arkansas certificate, along with the principal address
• Name a "responsible party" — typically a general partner — who has a valid US Social Security number or ITIN
• Submit, and the EIN is issued immediately on screen

The whole thing takes about ten minutes, and you can download the confirmation and use the number the same day. Keep the confirmation letter with your partnership records; banks and accountants will ask for it.

If no partner has an SSN or ITIN

The online application requires the responsible party to have a US SSN or ITIN. If none of your partners has one, you can still get an EIN — you apply by fax or mail using Form SS-4 instead. This takes longer than the instant online route, so plan accordingly.

The IRS requires every EIN application to name a "responsible party" — the person who ultimately controls or manages the entity. For a limited partnership, that's naturally a general partner, since general partners are the ones who actually run the business.

Getting the responsible party right

• It should be a general partner, not a passive limited partner, because the responsible party is meant to be someone with genuine control
• The information must be accurate; the IRS uses it to associate the EIN with a real person
• If the responsible party changes later, the IRS expects you to update them using Form 8822-B

Pitfalls to avoid

• Paying a third party for the number itself: the EIN is free from the IRS; only pay for legitimate help with the broader filing, never for the number alone
• Name mismatches: use the partnership's exact legal name from the Arkansas certificate, not a shortened version or a DBA
• Applying too early: get the LP formed first so the IRS record and the state record line up
• Losing the confirmation: save the EIN confirmation letter; retrieving a lost EIN later is a hassle

The EIN is one piece of standing up a functioning Arkansas LP, and it slots neatly between formation and banking. Once you have the certificate from the state and the EIN from the IRS, you can open the partnership's bank account and start operating with clean separation between partnership and personal finances.

Getting an EIN is genuinely simple, so most partnerships handle it themselves. If you form your LP with Mainstay Filing, we make sure you know exactly when and how to obtain it as part of the overall sequence, so nothing gets done out of order. For the full formation walkthrough, see the start an LP page; for the tax filings the EIN enables, see the annual requirements page. What we don't do is provide tax advice about how your partnership should be taxed — that's a conversation for your CPA.