Getting an EIN for Your Louisiana Limited Partnership

The IRS assigns each business an Employer Identification Number, a nine-digit federal tax ID. Think of it as a Social Security number for your business — the number the IRS, banks, and other institutions use to identify the partnership. It is formatted as XX-XXXXXXX and is unique to your entity.

Why a limited partnership needs one no matter what

A single-member LLC can sometimes use the owner's Social Security number for federal taxes. A limited partnership cannot. By definition, an LP has multiple partners — at least one general and at least one limited — which means it files a federal partnership return and issues a Schedule K-1 to each partner. That partnership filing requires an EIN. There is no version of an LP that operates without one.

What you will use it for

• Filing the partnership's federal return (Form 1065) and issuing K-1s to the partners
• Opening the partnership's bank account — banks require the EIN, not a partner's SSN
• Hiring employees and running payroll
• State tax registrations, such as Louisiana sales tax or withholding accounts

Getting the EIN is one of the first things to do after your Certificate of Limited Partnership is accepted, because you need it before you can open the bank account and start operating.

Timing matters. Apply for the EIN after the Louisiana Secretary of State has accepted your Certificate of Limited Partnership, not before. The EIN attaches to a formed entity, and applying after formation ensures the partnership's legal name and details match what the state has on record. Applying before the entity exists can create mismatches you then have to untangle.

Once your certificate is accepted and the partnership is on the public record, you can apply immediately. The online application issues the number on the spot, so there is no reason to wait — you will want it in hand to open the bank account and set up any tax registrations. The sensible sequence is: form the LP, get the EIN, open the bank account, then start moving money.

The EIN is free directly from the IRS, and applying takes about ten minutes. Do not pay a third party a "fee to obtain your EIN" as if it were a government charge — the number itself is always free.

The online application

1. Go to the IRS EIN Assistant at IRS.gov and start a new application.
2. Select the entity type — a limited partnership files as a partnership.
3. Identify the responsible party, the person who controls or manages the partnership. This is typically a general partner (or a person who controls the entity that is the general partner). The responsible party needs a valid U.S. Social Security number or ITIN to apply online.
4. Enter the partnership's legal name exactly as it appears on the accepted Certificate of Limited Partnership, along with its address.
5. Answer the questions about the partnership's activity and expected employees.
6. Submit. The EIN is issued immediately — print or save the confirmation notice (CP 575) right away, because you will need it repeatedly.

Hours and one-per-day limit

The online EIN Assistant operates during posted IRS hours, and the IRS allows one EIN per responsible party per day. Plan your application within those windows.

If the responsible party does not have a U.S. Social Security number or ITIN, the online application is not available — but you can still get an EIN. You apply by completing Form SS-4 and submitting it to the IRS by fax or mail.

What to expect

• Fax is faster than mail; the IRS typically returns the EIN by fax within a few business days when you provide a return fax number.
• Mail takes longer, often several weeks.

This path matters for Louisiana LPs with foreign general partners or investors. The partnership can still obtain an EIN and operate; it simply uses the paper process. Many international founders work with a service or advisor to handle the SS-4 correctly, since errors on the form slow everything down.

Once issued, your EIN is permanent for the life of the partnership. You will not get a new one just because you change your address, your registered agent, or your business activities. Keep the CP 575 confirmation notice somewhere safe — banks and the IRS may ask for it, and replacing a lost confirmation means requesting a substitute letter (147C) from the IRS, which takes time.

When you might need a new EIN

A change in the partnership's structure can require a new EIN — for example, if the LP converts to a different entity type or is restructured in a way the IRS treats as a new entity. Routine changes do not. When in doubt about whether a structural change requires a new number, check with your CPA before assuming your existing EIN carries over.

Guard it

Your EIN appears on tax filings and bank paperwork, but treat it with care. It is a key identifier for the partnership, and you should not scatter it across unsecured forms or share it more broadly than necessary.

Most EIN problems are avoidable, and they almost always come from small errors made in a hurry. A few worth guarding against.

Applying before the entity exists

Applying for the EIN before the Secretary of State has accepted your Certificate of Limited Partnership creates a name-and-entity mismatch that can complicate your tax filings and bank onboarding. Form first, then apply, so the partnership's legal name on the EIN exactly matches the state record.

Entering the name inconsistently

The name on the EIN application should match your accepted certificate character for character, including the limited-partnership designator. A version that reads "Bayou Holdings LP" on the EIN and "Bayou Holdings, L.P." on the certificate can cause friction with banks and the IRS. Consistency across every document saves headaches later.

Paying for something that is free

Some sites present themselves as the EIN issuer and charge a fee as though it were a government cost. The EIN is always free directly from the IRS. A formation service may legitimately bundle EIN handling into a package, but never pay a standalone government-style fee for the number itself.

Choosing the wrong responsible party

The responsible party should be a general partner or a person who genuinely controls the partnership — not an assistant, an accountant, or a limited partner who has no control. The IRS expects the responsible party to be someone with real authority over the entity, and naming the wrong person can require a correction later.

Losing the confirmation

Save the CP 575 notice the moment it issues. Recovering a lost confirmation means requesting a 147C letter from the IRS, which takes time you may not have when a bank is asking for proof. Store it with your formation documents where you can find it.