EIN Guide for a Kentucky Limited Partnership

Issued by the IRS, an Employer Identification Number is your business's nine-digit federal tax ID. Think of it as a Social Security number for your business — the identifier the IRS, banks, and other institutions use to recognize the partnership as a distinct entity.

Why a limited partnership essentially always needs one

Unlike a single-member LLC, which can sometimes use the owner's Social Security number, a limited partnership has structural features that require an EIN in nearly every case:

• It has more than one owner. An LP has at least one general and one limited partner, so it is never a single-owner entity.
• It files a partnership return. The LP files Form 1065 with the IRS, which requires an EIN.
• It issues K-1s. Each partner receives a Schedule K-1 tied to the partnership's EIN.
• Banks require it. Practically every bank wants an EIN to open a business account for a partnership.

Because of all this, you should plan to get an EIN as a standard part of forming your Kentucky LP — not an optional extra.

The order in which you do things affects how smoothly the EIN application goes.

Form the partnership first

Apply for the EIN after your Certificate of Limited Partnership is filed and accepted by the Kentucky Secretary of State. The EIN application asks for the legal name of the entity and where it was organized, and having the LP officially in existence keeps the answers clean. Applying for an EIN before the entity exists creates a mismatch between the IRS record and the state record that can cause confusion later.

Get it before you bank or hire

You will need the EIN before you can open the partnership's bank account, and before you can put anyone on payroll if the LP will have employees. Since the online application issues the number immediately, there is no reason to delay once the LP is formed. Get it early so the next steps — banking, contracts, tax setup — are not held up.

Every EIN application must name a responsible party — the person who ultimately controls or manages the entity. For a limited partnership, this detail deserves attention because of the general/limited split.

Who the responsible party is for an LP

The responsible party is generally the general partner — the one who manages the partnership and exercises control. A limited partner, being passive, is not the responsible party. The IRS wants a real individual in this role: a natural person with a Social Security number or ITIN, not an entity, even if your general partner is itself an LLC or corporation.

When the general partner is an entity

If you structured the LP with an LLC or corporation as the general partner, the responsible party on the EIN application is still an individual — typically the person who controls that general-partner entity (for example, its managing member or an officer). The IRS is looking for the human being with ultimate control, not a chain of entities. Identify that person before you start the application so you have their Social Security number or ITIN ready.

The application is short, and the online route is the fastest.

Online — the standard path

1. Go to the IRS EIN Assistant at IRS.gov. This is the official source; never pay a third party that merely resells the free EIN.
2. Select that you are applying for a partnership.
3. Enter the partnership's legal name exactly as it appears on the filed Certificate of Limited Partnership, and the Kentucky address.
4. Provide the responsible party's name and Social Security number or ITIN.
5. Answer the questions about the partnership's activity and expected employees.
6. Submit. The EIN is issued immediately — you can download the confirmation letter and start using the number the same day.

The online application is available during the IRS's posted hours and must be completed in one session; it will time out if left idle too long, so have your information ready.

By fax or mail

If the responsible party has no Social Security number or ITIN, or you prefer not to apply online, complete Form SS-4 and submit it by fax or mail. Fax turnaround is a matter of days; mail takes longer. This is the route many non-US responsible parties use.

Getting the number is not the end — a few things follow.

Keep the confirmation safe

The IRS issues an EIN confirmation (the CP 575 letter for mailed applications, or a downloadable letter online). Save it. Banks and other institutions often ask for it, and replacing a lost confirmation is a hassle.

Use it consistently

Use the EIN on the partnership's federal returns, on the K-1s issued to partners, when opening the bank account, and on any federal tax registrations. Consistency keeps the IRS record and your filings aligned.

Kentucky tax registration is separate

The EIN is a federal number. Kentucky has its own tax registrations — including for the Limited Liability Entity Tax and, if applicable, employer withholding and sales tax — handled through the Department of Revenue and the Kentucky Business One Stop portal. Your EIN is often required to complete those state registrations, but the EIN itself does not register you with Kentucky. Plan to handle the state registrations as a separate step.