Getting an EIN for Your New York LLP

An Employer Identification Number is a nine-digit federal tax ID that the IRS assigns. It functions as the business equivalent of a Social Security number — the number the IRS, banks, and other institutions use to identify the partnership.

A New York LLP effectively always needs one, for a structural reason: an LLP has at least two partners, so it files a partnership return (Form 1065) and is a separate taxpayer from the individual partners. A single-member LLC can sometimes get by using the owner's SSN, but that path does not exist for a partnership. The moment you have two or more partners, an EIN is required.

You will use the EIN to:

• File the partnership's federal Form 1065 and issue Schedule K-1s
• File the New York partnership return (Form IT-204)
• Open the firm's bank and merchant accounts
• Set up payroll if the firm employs staff
• Register for New York tax accounts such as withholding or sales tax where applicable

The EIN is not the same as a state tax ID

A common point of confusion: the federal EIN is issued by the IRS and identifies the partnership federally. It is not a New York State tax identification number. If your firm needs to withhold payroll taxes, collect sales tax, or set up other state tax accounts, you register separately with the New York Department of Taxation and Finance — and those registrations use the EIN as the anchor. So the EIN comes first, and the state accounts build on it. Getting the EIN does not, by itself, register you for anything at the state level.

The natural sequence is to get the EIN after the Certificate of Registration is filed and the LLP legally exists, but before you open bank accounts or set up payroll. Applying after registration means the partnership already has a legal name and structure to report on the application; applying before banking means you have the number in hand when the bank asks for it.

You can apply the same day the registration is confirmed — the EIN is issued immediately through the online application — so there is rarely a reason to delay once the firm is on the state's records.

The IRS issues EINs at no cost. The fastest route is the online EIN Assistant on IRS.gov.

The online application

• Takes about ten minutes to complete
• Issues the EIN immediately at the end, so you can download the confirmation and use the number the same day
• Is available during the IRS's posted hours for the tool
• Requires the responsible party — typically a managing partner — to provide a valid US Social Security number or ITIN

When it asks for the entity type, select partnership; a registered LLP files as a partnership by default. Report the correct number of partners and the firm's details as they appear on the Certificate of Registration.

If the responsible party has no SSN or ITIN

A partner without a US SSN or ITIN cannot use the online tool. In that case, apply by fax or mail using Form SS-4. Fax responses typically return the EIN within a few business days; mail takes several weeks. Plan for that lead time if it applies to your firm.

Avoid paid "EIN filing" services that charge for the number itself

Third parties sometimes market EIN retrieval for a fee. The underlying federal charge is zero — you are paying only for someone to fill out a free form. It can be a convenience when bundled with formation, but never mistake it for a mandatory government cost.

The IRS requires each EIN application to name a responsible party — a real person who controls or manages the entity, not another company. For a New York LLP, this is generally one of the partners, often the managing partner. The responsible party's SSN or ITIN is used to validate the online application.

If the responsible party changes later — a managing partner retires, for example — the IRS asks that you update the record using Form 8822-B within 60 days. Keeping the responsible-party information current avoids the IRS sending notices to someone no longer connected to the firm.

Once the EIN is issued, a few housekeeping steps keep it useful and your records clean:

• Save the confirmation letter (CP 575). This is the IRS's official notice of your EIN. Banks and licensing boards often ask to see it, and the IRS does not casually reissue it. Store a copy with your formation documents.
• Use the exact legal name on the EIN record consistently across bank accounts, tax filings, and contracts. Mismatches between the name on the EIN and the name on other filings cause processing headaches.
• Don't request a new EIN for ordinary changes. A New York LLP keeps the same EIN through address changes, adding or removing partners, and most restructurings. You generally only need a new EIN if the entity's fundamental structure changes — for example, if the partnership is dissolved and a genuinely new entity is formed.
• Register for state tax accounts as needed. The EIN is the anchor for New York withholding, sales tax, and other accounts your firm may need with the Department of Taxation and Finance.

Mainstay Filing can obtain the EIN as part of setting up your New York LLP, so the number is ready when you go to open bank accounts and file the first partnership return. We complete the application using the information from your Certificate of Registration and the responsible party you designate.

Because the EIN itself is free, this is purely about convenience and getting the sequence right — registration, then EIN, then banking and tax accounts. If you prefer to apply yourself, the online tool is straightforward for any responsible party with an SSN or ITIN; we are glad to fold it into a package if you would rather not juggle the steps.