Getting an EIN for an Ohio Limited Partnership

Issued by the IRS, an Employer Identification Number is a nine-digit federal tax ID. It functions as the business equivalent of a Social Security number: it identifies the partnership to the IRS, to banks, and to anyone the LP does formal business with. The format is XX-XXXXXXX, and once issued it belongs to the entity permanently.

Why an LP always needs one

For limited partnerships, the EIN is not optional the way it sometimes is for a single-member LLC. Here is why: a single-member LLC can, in some cases, be treated as a disregarded entity and use the owner's Social Security number. An LP cannot. By definition an LP has more than one owner — at least one general and one limited partner — and it files a partnership tax return. A partnership return requires the entity to have its own EIN. So the moment you form an Ohio LP, you need one.

What you will use it for

• Filing taxes: The LP's Form 1065 partnership return and the K-1s issued to partners all reference the EIN.
• Opening a bank account: Banks will not open a partnership account without the EIN.
• Hiring and payroll: If the LP has employees, the EIN ties to its payroll tax accounts.
• Vendor and licensing paperwork: Many vendors, lenders, and licensing bodies ask for it.

The single most important thing to know about getting an EIN is that it costs nothing. The IRS issues EINs at no charge. Any service that charges you a fee for the EIN number itself is charging for something the government gives away for free.

The online application

For the quickest turnaround, use the IRS EIN Assistant found at IRS.gov. The application takes about ten minutes, and if you qualify to use the online tool, the EIN is issued immediately at the end — 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 a single session; it does not save partway through.

What you will be asked

• The legal name of the limited partnership, exactly as filed on the Certificate.
• The type of entity — you will identify it as a partnership.
• The responsible party's name and taxpayer ID (SSN or ITIN).
• The LP's mailing address and the reason you are applying (starting a new business).
• The number of partners and expected employees, if any.

Have your Certificate handy

Apply for the EIN after your Certificate of Limited Partnership is filed, or at least after the name is locked, so the legal name on the EIN matches the state record exactly. A mismatch between the IRS name and the Secretary of State name creates friction later at the bank and on tax filings.

The EIN application asks for a "responsible party," and understanding that role matters — especially if the person applying does not have a US Social Security number.

Who the responsible party is

The responsible party is the person who ultimately controls or manages the LP and its funds — for a limited partnership, this is typically a general partner. The IRS wants a real individual behind the entity, not just another company. If your general partner is itself an entity (like an LLC), the responsible party is generally the individual who controls that entity.

Applying with an SSN or ITIN

The online EIN Assistant requires the responsible party to have a US Social Security number or an Individual Taxpayer Identification Number (ITIN). If your responsible party has one of these, the online route is quick and the number is issued on the spot.

Applying without an SSN or ITIN

If the responsible party is a non-US resident without an SSN or ITIN, the online tool will not work. You apply instead by completing Form SS-4 and submitting it to the IRS by fax or mail. This route is slower — fax responses can take several business days and mail considerably longer — but it is the established path for foreign partners forming a US LP. Leave the SSN/ITIN field handled per the SS-4 instructions for foreign applicants rather than guessing.

A few predictable errors turn a ten-minute task into a headache. They are all avoidable.

Paying for the EIN

The most common mistake is paying a third party for the number itself. The IRS issues it free. A legitimate filing service may charge to prepare and submit the SS-4 on your behalf as a convenience — that is a fee for the work, not for the number — but the EIN itself is never a government cost.

Applying before the name is settled

If you get the EIN under one name and then file the Certificate under a slightly different name, the IRS record and the state record disagree. Settle the LP's exact legal name first, then apply so the two match.

Choosing the wrong entity type

On the application, an LP is a partnership. Selecting the wrong classification — say, treating it like a corporation or a sole proprietorship — creates a record that does not match how the LP actually files, and correcting it with the IRS is more work than getting it right the first time.

Losing the confirmation letter

When the EIN is issued, save the confirmation (the CP 575 letter online, or the notice you receive by mail). Banks and lenders often ask to see it. If you lose it, you can request a replacement (a 147C letter) from the IRS, but keeping the original saves the hassle.

The EIN sits at a specific point in the formation sequence, and getting the order right keeps everything downstream smooth.

First, file the Certificate of Limited Partnership with the Ohio Secretary of State so the LP legally exists and its name is locked. Then apply for the EIN using that exact legal name — the entity should be on the state record before or at the same time as the IRS record, so the names line up. With the EIN in hand and the filed Certificate in front of you, you can open the partnership bank account, which requires both. From there, the LP is ready to operate: it has a legal existence with the state, a federal tax ID, and a place to hold its money separately from the partners' personal funds.

The EIN is a federal matter, entirely separate from anything Ohio charges or requires — the Secretary of State does not issue it and does not need to see it. If you would rather not deal with the SS-4 process, especially as a foreign partner without an SSN, Mainstay Filing can prepare and submit the application as part of getting your LP set up. We handle the paperwork; the number, as always, comes from the IRS at no cost.