EIN Guide for an Indiana Limited Partnership

An Employer Identification Number is a nine-digit tax ID that the federal government, through the IRS, assigns to a business. Think of it as the partnership's Social Security number — it identifies the entity on federal tax filings, bank paperwork, and payroll. For a limited partnership, getting one is not optional the way it sometimes is for a single-member LLC.

Why the LP structure requires it

A limited partnership has more than one owner by definition — at least one general partner and at least one limited partner. That means the IRS treats it as a partnership for tax purposes, and a partnership files its own federal return. It cannot file under any individual partner's Social Security number; it needs its own EIN. So the moment you form an Indiana LP, an EIN is on the required list, not the optional one.

What the EIN is used for

• Filing the partnership's federal return (Form 1065) and issuing Schedule K-1s to the partners
• Opening a bank account in the partnership's name — banks require it
• Setting up payroll and meeting employment tax obligations if the LP has employees
• Providing a tax ID to clients, vendors, and financial institutions that need one for reporting

How it differs from a single-member setup

Owners who have formed a single-member LLC before sometimes assume the EIN is a nice-to-have they can skip by using a Social Security number. That shortcut does not carry over to a limited partnership. Because an LP has two or more owners and files a partnership return, there is no version of the LP that operates on an individual's Social Security number the way a disregarded single-member LLC can. From the first day the partnership exists, it needs its own federal identity, and the EIN is that identity.

The EIN comes straight from the IRS at no cost. Be wary of any service that charges a fee simply to "obtain your EIN," because the number itself is always free; a legitimate charge is only for handling the application work, never for the number.

The online application

For the quickest turnaround, use the IRS EIN Assistant, found at IRS.gov. The online application:

• Takes roughly ten minutes to complete
• Issues the EIN immediately upon completion, so you can download the confirmation and use the number the same day
• Is available during the IRS's posted hours for the tool

You must complete an online session in one sitting — the tool times out after a period of inactivity — so gather your information before you start.

Alternatives to the online tool

If you cannot use the online application — most often because the responsible party does not have a U.S. Social Security number or ITIN — you apply using Form SS-4, submitted by fax or mail. This is slower than the instant online issuance but reaches the same result. International applicants without an SSN or ITIN generally use this route.

Having the right details ready makes the application quick. The IRS asks about the entity and the person responsible for it.

What to have on hand

• Legal name of the LP exactly as it appears on the accepted Certificate of Limited Partnership
• The entity type — you identify the business as a partnership
• The responsible party — a general partner (or the individual who controls the entity), along with their Social Security number or ITIN for the online tool
• The LP's mailing address
• The reason you are applying — typically starting a new business
• The number of partners and expected employment information, if the LP will hire

The responsible party

The IRS wants a single "responsible party" who ultimately controls the entity. For an LP, that is naturally a general partner, since general partners are the ones with authority over the partnership. This is not the same as listing every partner; you name one responsible party, and the limited partners are not part of this designation.

The EIN fits at a specific point in forming an Indiana LP, and doing it in the right order avoids rework.

File the certificate first

Apply for the EIN after the Certificate of Limited Partnership is accepted by the Secretary of State, not before. The application asks for the LP's legal name, and using the exact name from the accepted certificate keeps your federal and state records aligned. Applying before the entity is formed can create mismatches you then have to correct.

Then bank and operate

The EIN sits between formation and the practical steps that follow. Once you have it, you can open the partnership's bank account — banks want both the accepted certificate and the EIN — and set up any payroll or vendor relationships that need a tax ID. So the clean sequence is: file the certificate, get the EIN, open the account, then operate.

The EIN is a federal number, but it connects to your Indiana obligations and to a few pitfalls worth avoiding.

Federal versus state

The EIN itself is issued by the IRS and is used on your federal partnership return. Separately, if the LP has Indiana tax obligations — sales tax on taxable goods or services, or employment tax if it has employees — it registers with the Indiana Department of Revenue for those accounts, and the EIN is the identifier that ties everything together. Getting the EIN is a prerequisite to those state registrations, not a replacement for them.

Common mistakes to avoid

• Applying before the LP is formed. Wait for the accepted certificate so the legal name matches.
• Paying a third party just for the number. The IRS charges nothing; only pay for genuine help with the process.
• Getting more than one EIN for the same entity. An LP needs exactly one. If you accidentally obtain a duplicate, contact the IRS to sort it out rather than using both.
• Naming a limited partner as the responsible party. The responsible party should be a general partner who actually controls the entity.
• Losing the confirmation. Save the EIN confirmation notice; you will need the number repeatedly, and retrieving a lost EIN from the IRS is more tedious than keeping the original.