If you've recently formed a Wyoming LLC — or you're in the process of doing so — you've likely come across the term EIN. It appears on bank account applications, tax forms, and contractor paperwork. Understanding what it is, and how business owners typically use it, is one of the foundational steps in getting your business set up properly.
This guide explains what an EIN is, which types of businesses most commonly apply for one, what the process involves, and what's different for international clients who don't have a U.S. Social Security Number.
What Is an EIN?
EIN stands for Employer Identification Number. It is a nine-digit federal tax identification number issued by the Internal Revenue Service (IRS) in the format 12-3456789. The most straightforward way to think about it: an EIN is to your business what a Social Security Number (SSN) is to you personally. It's a unique identifier the federal government uses to track your business for tax purposes.
Despite the word "employer" in the name, you do not need to have employees to obtain one. Many solo business owners with no employees apply for an EIN simply to use it in place of their personal SSN on business documents — a practice many find valuable for privacy and professionalism.
EINs are issued by the IRS at the federal level. They are permanent — once assigned to your business, the number does not expire or change, even if you change your business name or address.
Who Typically Applies for an EIN?
Certain business structures and situations make an EIN a practical necessity. Others are more of a strong preference. Here is how most situations break down:
Multi-Member LLCs
If your LLC has more than one member (owner), it is treated as a partnership for federal tax purposes by default. Multi-member LLCs are generally required to have an EIN to file partnership tax returns (Form 1065) and to properly document income distributions to members.
LLCs With Employees
If your LLC hires employees — even a single part-time worker — an EIN is required. The IRS uses it to process payroll taxes, W-2 forms, and employment tax filings. Most payroll systems and employer-facing platforms will ask for it during setup.
LLCs That Elect S-Corp Taxation
Some LLC owners elect to have their LLC taxed as an S-Corporation, which may offer certain tax advantages depending on the business's income level and structure. This election requires an EIN, and the EIN must be on file before the election can be processed.
LLCs That Want to Open a Business Bank Account
Most U.S. banks require an EIN to open a business checking account. While a few institutions will work with a single-member LLC using the owner's SSN, many banks prefer or require an EIN as part of their business account application process. For this reason alone, many single-member LLC owners apply for an EIN shortly after forming their LLC.
What About Single-Member LLCs?
A single-member LLC (one owner, no employees) is technically a "disregarded entity" for federal tax purposes by default. In that structure, the owner may use their own Social Security Number for federal tax filings rather than a separate EIN — the IRS treats the LLC's income as flowing directly to the owner's personal return.
That said, many single-member LLC owners choose to apply for an EIN anyway, for reasons that are largely practical:
- Privacy. Using an EIN on contractor agreements, 1099 forms, and vendor applications means your personal SSN stays off those documents. Many business owners find this preferable, particularly for those operating in public-facing industries.
- Banking. As noted above, most business bank accounts require an EIN regardless of LLC structure.
- Professionalism. Many clients and platforms ask for a tax ID when onboarding new vendors or contractors. Providing an EIN rather than a personal SSN is a common and straightforward way to handle those requests.
- Future-proofing. If the business later takes on employees, elects S-Corp status, or adds a second member, an EIN will be required at that point. Many owners simply apply at formation to avoid the additional step later.
A Note on Privacy
Wyoming LLC owners who form with privacy in mind — keeping their name off public records — often extend that thinking to their tax ID as well. Using an EIN on business documents is one way many owners avoid sharing their personal SSN with clients, platforms, and vendors. Privacy that holds means thinking about every touchpoint, not just the formation documents.
Common Ways Business Owners Use Their EIN
Once obtained, an EIN is used across a wide range of business activities. The most common include:
- Opening a business bank account — virtually all business checking accounts require it
- Filing federal business tax returns — including partnership returns (Form 1065), S-Corp returns (Form 1120-S), or employment tax returns
- Hiring employees — required for payroll processing and employer tax filings
- Applying for business credit — business credit cards, lines of credit, and many financing applications ask for it
- Setting up accounts with vendors and platforms — many wholesale suppliers, payment processors, and platforms request a tax ID during onboarding
- Completing W-9 forms — when a business is paid as a contractor or vendor, clients typically request a completed W-9, which asks for either an SSN or EIN
How the EIN Application Process Works
The EIN is issued by the IRS via Form SS-4. How the process works — and how long it takes — depends primarily on whether the applicant has a U.S. Social Security Number.
For U.S. Residents With an SSN
The IRS issues EINs to applicants with a U.S. SSN. The process involves submitting Form SS-4 information with the IRS. When handled correctly, this process is relatively straightforward, though it does require navigating IRS procedures and providing the right information in the right format. Many business owners choose to use a document preparation service to handle it so they can focus on building their business rather than managing government paperwork.
Typical timeline with an SSN: EINs are generally issued promptly once the application is processed correctly.
For International Clients Without an SSN
Non-U.S. residents who do not have a Social Security Number face a more involved process. The IRS online application system is only available to applicants with a U.S. SSN or ITIN (Individual Taxpayer Identification Number). International applicants must apply using Form SS-4 submitted by fax or mail to the IRS.
This adds meaningful complexity:
- The form must be completed precisely — errors result in delays or rejection
- Fax submissions to the IRS are processed in roughly 4–6 weeks under normal circumstances; mail submissions take longer
- There is no online tracking system; following up requires calling the IRS Business & Specialty Tax Line directly
- The IRS representative handling the application may request additional documentation or clarification
International clients forming Wyoming LLCs often find this to be the most time-consuming part of the formation process. Having experienced help navigating this step is something many international owners find worthwhile.
Many international business owners form their Wyoming LLC in a matter of days — then wait weeks for their EIN while their bank account application sits pending. Starting the EIN process at the same time as formation, rather than after, is something many experienced formation services recommend.
EIN Timing: A Summary
| Situation | Method | Typical Timeline |
|---|---|---|
| U.S. resident with SSN (using a service) | Form SS-4 via professional filing | Prompt — generally within days |
| International client, no SSN — fax | Form SS-4 by fax to IRS | Approximately 4–6 weeks |
| International client, no SSN — mail | Form SS-4 by mail to IRS | 8–12 weeks or longer |
Can One Business Have Multiple EINs?
Generally, no. Each distinct legal entity is assigned one EIN. If you have multiple LLCs, each one is a separate legal entity and would have its own EIN. If you restructure your business in a way that creates a new legal entity (for example, converting an LLC to a corporation), the new entity would typically require a new EIN.
Does an EIN Expire?
No. An EIN is permanent once issued. It stays with the business entity it was assigned to. Even if your business becomes inactive for a period of time, the EIN does not expire. If you close your business and later form a new one, the new entity would receive a new EIN — the old one is not reactivated.
Our EIN Filing Service
We offer EIN filing as an add-on to Wyoming LLC formation. Our service is designed to take the paperwork off your plate so you get the right result without navigating IRS procedures yourself.
- With a U.S. SSN: $79 — we prepare and submit your SS-4 filing
- Without a U.S. SSN (international): $149 — we prepare your SS-4 and handle fax submission to the IRS, with follow-up as needed
For international clients especially, having a service manage this process — including preparation, correct fax transmission, and follow-up with the IRS if needed — is something many owners find valuable given the complexity and timeline involved.
Add EIN Filing to Your Wyoming LLC Order
We handle the paperwork. You focus on your business. EIN filing available as an add-on with any Wyoming LLC formation package — $79 with SSN, $149 for international clients.
Get My EIN Filed