EIN Guide · What a federal EIN is, why your Wyoming LLP needs one, and how to get it.
Getting an EIN for a Wyoming LLP
A Wyoming limited liability partnership needs a federal Employer Identification Number to file its partnership return, open a bank account, and hire people. This page explains what an EIN is, why an LLP needs one, exactly how to get it from the IRS for free, and the mistakes to avoid along the way.
One price: $199.00/yr covers your formation, your registered agent, and your annual report, plus the $100.00 state filing fee, at cost.
State agency: Wyoming Secretary of State, Business Division (filed online via WyoBiz)
Annual report due: Anniversary of formation · Processing: Same day
✓ No hidden fees ✓ No second-year price hikes ✓ No missed filings
State facts
Wyoming LLP
What an EIN Is and Why an LLP Needs One
Issued by the IRS, an Employer Identification Number is the nine-digit federal tax identification number a business uses to identify itself. Think of it as a Social Security number for your business — it identifies the partnership to the federal government for tax purposes and to banks and other institutions that need to verify the entity.
Why a partnership almost always needs one
Unlike a single-owner business that might get by using a personal Social Security number, a limited liability partnership has more than one owner by definition, and that changes the picture. A multi-partner business files its own federal return, and that requires an EIN.
- Federal tax filing. A partnership files Form 1065, the U.S. Return of Partnership Income, and issues a Schedule K-1 to each partner. The partnership return is filed under the EIN.
- Bank accounts. Banks require an EIN to open an account in the partnership's name. You cannot realistically run an LLP's finances without one.
- Hiring and payroll. If the LLP has employees, the EIN is used for federal employment tax filings and payroll reporting.
- Vendor and client paperwork. Clients often request a W-9 with the partnership's EIN before they pay, and vendors may need it too.
For practical purposes, treat the EIN as a required early step, right after the LLP registration is filed.
How to Apply for an EIN
The IRS issues EINs at no cost, and the fastest route is the online application. Never pay a third party a fee purely to "get" an EIN — the number itself is free directly from the IRS.
Apply online (the fast way)
The IRS EIN Assistant at IRS.gov is the quickest method. The application takes about ten minutes, and the EIN is issued immediately at the end — you can download the confirmation and start using the number the same day.
- The online tool is available during posted IRS hours (generally weekday business hours, Eastern time).
- You complete the application in a single session; it does not save partway through, so have your information ready.
- The responsible party — typically a partner — must provide a valid U.S. Social Security number or ITIN to use the online tool.
Apply by fax or mail
If the responsible party does not have an SSN or ITIN, or you prefer a paper trail, you can file Form SS-4 by fax or mail. Fax responses typically come back within a few business days; mail takes considerably longer. International applicants without a U.S. taxpayer ID commonly use this route, and can also apply by phone through the IRS's international line.
What you provide on the application
- The legal name of the partnership and its Wyoming address.
- The entity type (partnership) and the reason for applying (started a new business).
- The responsible party's name and taxpayer identification number.
- The number of partners and expected employment details, if any.
The Responsible Party and Other Details
The IRS application asks for a "responsible party," and getting this right matters because the IRS ties the EIN to that person.
Who is the responsible party?
The responsible party is the individual who ultimately controls or manages the partnership — usually one of the partners. It should be a real person, not another entity, and the IRS expects the responsible party to have a valid taxpayer identification number. For an LLP, one of the partners generally serves in this role on the application.
One EIN per partnership
Your LLP needs exactly one EIN. Do not apply multiple times — duplicate applications create confusion in the IRS's records. If you already have an EIN and simply need the confirmation letter again, you can request a replacement (a 147C letter) from the IRS rather than applying anew.
Timing relative to registration
Apply for the EIN after your LLP registration is filed and you have your partnership name settled. Getting the EIN before the name is final risks a mismatch between the IRS record and the state record. Once the registration is done, the EIN is a quick same-day step.
What to Do With Your EIN
Once you have the EIN, it becomes a working part of the partnership's identity. Put it to use and keep it safe.
Immediate uses
- Open the partnership's bank account. Bring the EIN confirmation, the filed LLP registration, and the partnership agreement.
- Set up accounting and invoicing. Your bookkeeping and any invoicing system will reference the EIN.
- Provide W-9s. When clients ask for a W-9, the partnership's EIN goes on it.
- Register for other tax accounts as needed, such as state sales tax or employment accounts, which reference the EIN.
Keep it secure
Your EIN is not as sensitive as a Social Security number, but it should still be handled carefully. Store the confirmation letter somewhere safe, and share the number only with parties that have a legitimate need — banks, the IRS, clients requesting a W-9, and your accountant.
Keep the confirmation letter
The IRS confirmation (the CP 575 issued when the EIN is assigned) is the document banks and others may ask to see. Save a copy. If you lose it, the IRS can issue a 147C verification letter as a replacement.
How Mainstay Filing Fits In
Getting an EIN is genuinely simple when you have your partnership details in order, and it is free directly from the IRS. Our role is to make sure the steps leading up to it are done right so the EIN application goes smoothly.
We register your LLP with the Wyoming Secretary of State first, so your partnership name and entity are properly established before you apply. That sequencing matters — applying for the EIN under a name that does not match your state registration creates avoidable headaches. With the registration in hand and your partnership name settled, the EIN application is a quick, same-day task you can complete through the IRS EIN Assistant.
If you would rather not deal with the IRS form at all, we can point you through it, but we will always be clear that the EIN itself costs nothing from the IRS. What we charge for is the state filing and registered agent service — not for a free federal number. Our goal is to get your partnership properly registered and set up, with no padding for things you can get directly from the government at no cost.
Frequently asked questions
Does a Wyoming LLP need an EIN?
Yes, in practice. A limited liability partnership has more than one owner, files a federal partnership return (Form 1065), and needs to open a bank account — all of which require an EIN. Even setting those aside, clients frequently request the partnership's EIN on a W-9 before paying. Treat the EIN as a required early step after registering the LLP.
How much does an EIN cost?
Nothing. The IRS issues EINs at no cost. Be wary of any service that charges a fee purely to obtain an EIN, since you can get it directly from the IRS for free. The online EIN Assistant at IRS.gov issues the number immediately at the end of a short application.
How long does it take to get an EIN?
If you apply online through the IRS EIN Assistant, the number is issued immediately — you can use it the same day. Applying by fax with Form SS-4 typically takes a few business days, and mail takes considerably longer. The online route is by far the fastest for anyone with a U.S. Social Security number or ITIN.
Who should be the responsible party for an LLP's EIN?
The responsible party is the person who ultimately controls or manages the partnership — normally one of the partners. It should be an individual with a valid taxpayer identification number, not another entity. For an LLP, a partner typically serves as the responsible party on the application.
Can I get an EIN before registering my LLP?
It is better to register the LLP first. Applying for the EIN after your Wyoming registration is filed ensures the partnership name and entity match between the IRS and the state, which avoids record mismatches. Once the registration is done and the name is settled, the EIN is a quick same-day step.
Ready to form your Wyoming LLP?
Formation, your registered agent, and your annual report. One price, $199.00/yr, with the state fee passed through at cost.
Form Your Wyoming LLP ($199.00/yr All-In)