EIN Guide for a West Virginia Limited Partnership

An Employer Identification Number is a nine-digit federal tax ID the IRS assigns to a business. Think of it as a Social Security number for your limited partnership — the identifier the federal government uses to track the entity for tax purposes. It's issued free by the IRS.

Why a limited partnership always needs one

Unlike a single-member LLC, which can sometimes operate on the owner's Social Security number, a limited partnership always needs its own EIN. The reason is structural: a partnership has more than one owner and must file a federal partnership information return (Form 1065) every year, issuing a Schedule K-1 to each partner. That filing requires the partnership to have its own EIN. There's no version of a compliant LP that runs on an individual's SSN.

Where the EIN gets used

• Federal tax filings — the partnership's Form 1065 and the K-1s issued to general and limited partners.
• Banking — banks require the EIN to open the partnership's account.
• Hiring — if the LP has employees, the EIN is used for payroll tax withholding and employment tax filings.
• State registration — West Virginia's One Stop Business Portal accounts and other state tax registrations reference the EIN.

The IRS requires every EIN application to name a responsible party: the individual who ultimately owns or controls the entity, or who exercises effective control over it. For a limited partnership, this is almost always a general partner — the person who actually manages the business — rather than a passive limited partner.

Why the general partner is usually the responsible party

Because the general partner controls the LP's operations and funds, they fit the IRS definition of the person who controls the entity. A limited partner, by design, is a passive investor and generally wouldn't serve as the responsible party. If your LP has multiple general partners, one of them is named as the responsible party on the application; that choice doesn't change the others' roles or the partnership's structure.

Responsible party requirements

• The responsible party must be a person (not another entity), except in limited circumstances.
• For the fast online application, the responsible party needs a valid U.S. Social Security number or ITIN.
• The IRS limits responsible parties to one EIN per day, so plan accordingly if you're setting up multiple entities.

Applying is straightforward and free directly from the IRS. Be wary of third-party sites that charge a fee purely to obtain an EIN — the number itself costs nothing.

The online application (fastest)

The IRS EIN Assistant at IRS.gov is the quickest route. The session takes about ten minutes, and the EIN is issued immediately at the end — you can download the confirmation letter and start using the number the same day. The online tool is available during posted hours and must be completed in one sitting; it times out if you leave it idle.

Fax or mail (for applicants without an SSN or ITIN)

If the responsible party doesn't have a U.S. SSN or ITIN, you can't use the online tool. Instead, complete Form SS-4 and submit it by fax or mail. Fax responses typically come back within a few business days; mail takes longer. This is the standard path for LPs with a foreign responsible party.

When to apply

Apply after your Certificate of Limited Partnership is filed and the LP legally exists — the EIN belongs to the entity, so it makes sense for the entity to exist first. You'll want the EIN in hand before opening the partnership's bank account, which is one of the first things you'll do with a new LP.

Gather a few pieces of information before you open the application so you can finish it in one pass:

• The LP's exact legal name as filed on the Certificate of Limited Partnership, including the LP designator.
• The formation state (West Virginia) and formation date.
• The responsible party's name and SSN or ITIN — typically a general partner.
• The partnership's mailing address.
• The reason for applying (usually "started a new business").
• The expected number of employees, if any, over the coming year.
• The type of entity — you'll select partnership, since an LP files as a partnership by default.

Having the filed certificate next to you helps, because the IRS wants the entity's legal name to match exactly. A mismatch between the EIN record and the state filing can cause friction later with banks and tax filings.

The EIN unlocks the next practical steps in standing up your LP, and a little care up front prevents headaches later.

Keep the confirmation safe

Download and store the IRS confirmation letter (the CP 575) somewhere secure. Banks and other institutions sometimes ask for it, and getting a replacement from the IRS is slower than keeping the original.

Open the partnership bank account

With the EIN and the filed certificate in hand, open a dedicated bank account in the LP's name. Keeping partnership funds separate from any partner's personal money is essential for clean accounting and for preserving the limited partners' liability shield — commingling undermines the structure you set up.

Register for state taxes

Use the EIN when registering the LP's West Virginia tax accounts through the One Stop Business Portal, and when setting up payroll if you hire. The number ties the entity together across federal and state systems.

Update the responsible party if it changes

If the responsible party for the LP changes — say, a new general partner takes over — the IRS asks you to update the record using Form 8822-B within a set period. Keeping the responsible party current avoids confusion if the IRS ever needs to reach the entity.