EIN Application for Wyoming LLC: How to Get Your EIN
By {AUTHOR_OPS_NAME}, Director of Filing Operations | Published May 15, 2026
An Employer Identification Number is required for every Wyoming LLC that needs a bank account, which means every Wyoming LLC. This guide covers application methods, timelines, Form SS-4 details, the non-resident process, and what CSF handles on your behalf.
What Is an Employer Identification Number?
An Employer Identification Number, commonly called an EIN or Federal Tax Identification Number, is a unique nine-digit number assigned by the Internal Revenue Service to business entities operating in the United States. The EIN serves the same function for a business entity that a Social Security Number serves for an individual: it identifies the entity for tax reporting purposes. The EIN is formatted as XX-XXXXXXX, with two digits followed by a hyphen and seven digits. Every Wyoming LLC needs an EIN regardless of whether it has employees. The EIN is required to open a business bank account at any US financial institution. It is required on federal tax returns, whether the LLC files its own return as a partnership or corporation or reports through the member’s individual return as a disregarded entity. The EIN is also required when hiring employees, filing payroll taxes, and setting up retirement plans. There is no fee to obtain an EIN from the IRS. The application is free regardless of the method used.
Why Your Wyoming LLC Needs an EIN
The primary practical reason every Wyoming LLC needs an EIN is bank account opening. No US bank will open a business account without an EIN. Mercury, Relay, Bluevine, and every other bank CSF works with require the EIN confirmation letter from the IRS as part of the account application. Beyond banking, the EIN is necessary for federal tax compliance. Single-member LLCs taxed as disregarded entities report income on the member’s individual return but still need an EIN for banking and for filing certain federal forms. Multi-member LLCs taxed as partnerships must file Form 1065 using the LLC’s EIN. LLCs that elect corporate taxation under Subchapter S or C file corporate returns using the EIN. If the LLC hires employees, the EIN is required for payroll tax deposits and W-2 reporting. Independent contractors paid by the LLC receive Form 1099-NEC bearing the LLC’s EIN. The EIN is a foundational requirement that enables virtually every financial and tax function of the LLC. Without it, the LLC exists as a legal entity but cannot operate financially.
EIN Application Methods: Online, Fax, and Mail
The IRS offers three methods to apply for an EIN. Online application is available at irs.gov for responsible parties who have a valid Social Security Number or Individual Taxpayer Identification Number. The online application is completed in a single session, cannot be saved and resumed, and results in immediate EIN issuance upon completion. The EIN is displayed on screen and a confirmation notice is available for download. This is the fastest method. Fax application using Form SS-4 is the method for responsible parties who do not have an SSN or ITIN, including most non-US residents. The completed Form SS-4 is faxed to the IRS at (855) 215-1627 for international applicants. Processing takes four to six weeks. The IRS returns the EIN assignment by fax to the number provided on the form. Mail application is the slowest method. Form SS-4 is mailed to the IRS at Internal Revenue Service, Attn: EIN Operation, Cincinnati, OH 45999. Processing takes four to six weeks after receipt. CSF does not use the mail method due to the extended timeline and lack of delivery confirmation.
CSF EIN Service (Included in $497)
Cowboy State Filings handles the EIN application as part of the $497 formation package at no additional charge. There is no separate fee for EIN acquisition. CSF prepares IRS Form SS-4 using the information provided during intake, including the LLC name exactly as it appears on the approved Articles of Organization, the LLC’s mailing address, the responsible party’s name and identification number, and the LLC’s formation date from the Wyoming Secretary of State. For responsible parties with an SSN, CSF submits the online application and typically obtains the EIN within five to seven business days of state filing acceptance. The slight delay from instant issuance is due to the sequential nature of the process: the Articles must be accepted first, then the EIN application is submitted. For non-resident responsible parties, CSF prepares and faxes Form SS-4 to the IRS international fax number. CSF monitors the fax response and follows up with the IRS if the response is not received within the expected timeframe. Upon receiving the EIN, CSF forwards the confirmation to the client and immediately begins bank account applications.
Non-Resident EIN Application Process
Non-US residents who do not have a Social Security Number or ITIN can still obtain an EIN for their Wyoming LLC. The process differs from the standard online application. The responsible party must provide their passport number, country of issuance, and foreign address on IRS Form SS-4. The form cannot be submitted online because the IRS online system requires an SSN or ITIN for identity verification. Instead, the completed Form SS-4 is faxed to the IRS international applicant line at (855) 215-1627. The IRS processes the fax and returns the EIN assignment by fax within four to six weeks. In some cases, processing may be faster, but four to six weeks is the timeframe the IRS communicates. This extended timeline is the primary reason the overall formation process takes longer for non-US residents. CSF handles the fax filing, monitors for the IRS response, and follows up if necessary. Some third-party services charge $100 to $300 for non-resident EIN filing. CSF includes this in the $497 formation package with no additional charge. The EIN, once issued, is permanent and does not expire.
Responsible Party on Form SS-4
IRS Form SS-4 requires identifying a responsible party, defined as the individual who controls, manages, or directs the entity and the disposition of its funds and assets. For a single-member LLC, the responsible party is the sole member. For a multi-member LLC, the responsible party is typically the managing member or the member with the greatest ownership interest. The responsible party must be an individual, not another entity. A corporation, LLC, or trust cannot be listed as the responsible party. The individual listed must provide their SSN, ITIN, or, for non-US residents without either, their passport identification. The responsible party designation on the EIN application does not create any additional tax liability for that individual. It simply identifies the primary IRS contact for the LLC. If the responsible party changes after the EIN is issued, Form 8822-B must be filed with the IRS to update the responsible party on record. CSF advises clients on who should be listed as the responsible party during the intake process based on the LLC’s membership and management structure.
EIN vs. SSN vs. ITIN: Understanding the Differences
Three types of tax identification numbers are relevant to Wyoming LLC formation. A Social Security Number is issued to US citizens and authorized permanent residents for personal income tax reporting and Social Security benefit tracking. It is nine digits formatted as XXX-XX-XXXX. An Individual Taxpayer Identification Number is issued to individuals who must file US tax returns but are not eligible for an SSN, typically non-resident aliens with US tax obligations. It is nine digits formatted like an SSN but always begins with the digit 9. An Employer Identification Number is issued to business entities for business tax identification. It is nine digits formatted as XX-XXXXXXX. A Wyoming LLC needs its own EIN separate from any member’s SSN or ITIN. The member’s SSN or ITIN is used on the EIN application to identify the responsible party but is not used as the LLC’s tax identification going forward. The EIN is the LLC’s unique identifier for all federal tax filings, bank accounts, and official business purposes. Once issued, the EIN remains with the LLC permanently and does not change unless the LLC undergoes a change in structure requiring a new EIN.
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Frequently Asked Questions About EIN Applications
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EIN acquisition is included in the $497 CSF formation package. We handle IRS Form SS-4 for both US and non-US residents.
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