Everything about getting an Employer Identification Number for a US LLC in 2026. How the IRS issues EINs under Treasury Reg § 301.6109, Form SS-4 field by field, the difference between online and fax filing, the non-resident fax workflow, the responsible party rules, the 147C letter when CP 575 is lost, EIN security best practices, and common rejection causes.
An Employer Identification Number (EIN) is a nine-digit federal tax identification number issued by the Internal Revenue Service under the authority of IRC § 6109(a) and Treasury Regulation § 301.6109-1(d). The EIN identifies a business entity for federal tax purposes the way a Social Security Number identifies an individual. It is formatted as XX-XXXXXXX (two digits, hyphen, seven digits) and is permanent — once assigned to an entity, the EIN never expires and is never reassigned to another entity.
Every US LLC needs an EIN for at least four reasons: opening a business bank account (every US bank requires an EIN under Bank Secrecy Act customer-identification rules, even for single-member disregarded LLCs that could technically use the owner's SSN for tax filing), filing federal taxes (Form 1065 partnership, Form 1120-S S-corp, Form 5472 non-resident reporting, and Forms 941/940 payroll all require the EIN in the entity-identification block), hiring employees (W-2 issuance requires an EIN), and processing payments through US merchant rails (Stripe, PayPal, Square, Wise, and similar platforms require an EIN for business accounts).
The IRS does not charge any fee for EIN issuance. The IRS treats EIN issuance as a public service under IRC § 6109 and Notice 2006-66. Any third-party service that charges a fee — including Anonymousllc.co's $99 EIN service — charges for the preparation, third-party-designee submission, and CP 575 delivery work, not for the EIN itself. For US residents with an SSN, the IRS online portal at irs.gov/businesses/ein delivers the EIN free in minutes; for non-residents without an SSN or ITIN, the fax-only application route is materially more work and is where the value of paid services concentrates.
EIN issuance is one-per-responsible-party-per-day. The IRS limits each responsible party to one EIN per business day to prevent automated mass-issuance — a 2012 administrative rule following abuse of the online portal. Founders forming multiple LLCs on the same day will hit this throttle if they try to apply for all EINs simultaneously. The practical workaround is to space EIN applications across calendar days or rotate which person is named as responsible party (subject to the responsible-party-control rules discussed in the dedicated section below).
EIN application data is protected from public disclosure under IRC § 6103, the same statute that protects all federal tax-return information. The IRS does not publish a searchable EIN database, does not confirm EIN-to-entity matches to non-authorized parties, and does not share Form SS-4 data with state secretaries of state, beneficial-ownership registries, or other agencies. Public EIN appearances are incidental — the EIN may appear on state business licenses, on Form 990 filings for nonprofits, or on SEC filings for public companies — but the underlying SS-4 application detail (responsible party name, address, signature) is never public.
An EIN does not authorize US business operation, does not constitute a state-level registration, and does not establish tax residency. It is purely a federal tax-ID number. State registrations (formation, foreign qualification, sales-tax permits, payroll registrations) are separate workflows handled at the state level. Many founders confuse "having an EIN" with "being a legally registered business" — they are distinct. The EIN is the federal layer; state formation (covered in the LLC Formation pillar) is the underlying business existence.
The IRS accepts EIN applications through four channels with materially different timelines and eligibility requirements. Online application at irs.gov/businesses/ein is the fastest — same-day, EIN issued immediately upon submission. Eligibility: the responsible party must have a valid SSN, ITIN, or existing EIN as their taxpayer identification number. The portal is available Monday through Friday, 7 AM to 10 PM Eastern. Applications are limited to one per responsible party per business day under the IRS administrative rule from 2012.
Fax application is the channel that matters for non-resident founders. Form SS-4 is faxed to the IRS at +1-855-215-1627 (within the US) or +1-304-707-9471 (international). The IRS Cincinnati service center processes the form, issues the EIN in roughly 4–6 weeks, and mails the CP 575 confirmation letter to the address on the SS-4. The fax route does not require an SSN — the responsible party can list a foreign tax identification number from their home country. This is the only channel available to non-resident applicants without a US tax ID.
Mail application sends Form SS-4 to the IRS service center at Cincinnati, OH 45999, with processing time of 6–8 weeks. The mail channel offers no advantage over fax — same eligibility, longer timeline. Most practitioners avoid it. Phone application was historically available only for international applicants by calling +1-267-941-1099 (the IRS international taxpayer line) Monday through Friday 6 AM to 11 PM Eastern. The IRS suspended the international phone EIN application in March 2024 and has not announced restoration. Fax is currently the default for international applicants.
Anonymousllc.co's $99 EIN service uses the fax channel for non-resident applicants via a third-party designee — an authorized representative who signs Form SS-4 Section III and receives the CP 575 letter on behalf of the LLC. The third-party-designee mechanism is governed by IRC § 6103(c) and Form SS-4 instructions: the designee is authorized to receive the EIN but does not become the responsible party or control the LLC. The designee designation expires 90 days after EIN issuance unless extended. This is the standard workflow for founders who cannot apply online and who want professional handling of the IRS interaction.
IRS processing backlog historically extends fax-channel timelines beyond the published 4–6 week window. During peak filing seasons (January–April for annual returns, August–October for extensions) the queue can stretch to 8–10 weeks. The IRS Office of the Taxpayer Advocate has flagged EIN processing as a chronic backlog area in its annual reports to Congress. The fax channel offers no expediting mechanism — there is no "rush" lane. Plan EIN application 8–12 weeks before the date you actually need the EIN for banking or filing deadlines.
Online-applicant edge cases: US residents with SSNs but using foreign mailing addresses can use the online portal (the responsible party's identity is the SSN, not the address); LLCs with non-US mailing addresses can also use online filing if the responsible party is US-resident. The online portal rejects applications where the responsible party's TIN is not an SSN, ITIN, or US-issued EIN. For dual-status founders (US citizen abroad, green card holder abroad), the online portal works. For pure non-residents, fax is the only route. See the ITIN pillar for the related personal-tax-ID workflow, although note that ITIN is not required to obtain an EIN.
Form SS-4 is the EIN application — a single page plus instructions. Every line must be completed (or marked N/A) to avoid rejection. Line 1 (Legal name of entity): the exact name as registered with the state secretary of state, including "LLC" or "L.L.C." suffix. Mismatch between SS-4 line 1 and the state filing is the most common rejection cause for newly-formed LLCs. Line 2 (Trade name / DBA): only if the LLC operates under a name different from line 1; otherwise leave blank.
Line 3 (Executor / administrator / trustee name): blank for LLCs; used only for estates and trusts. Line 4a–4b (Mailing address): where the IRS will mail correspondence including the CP 575 confirmation letter. Foreign addresses are accepted — write the country name in line 4b after city/state. PO Box addresses are accepted. Line 5a–5b (Street address): physical location of the business, only required if different from line 4. Most LLCs leave 5 blank and use the registered-agent address on line 4.
Line 6 (County and state of principal business location): the registered-agent's county and state for most non-resident-owned LLCs. Line 7a (Name of responsible party): the individual who controls, manages, or directs the entity — covered in detail in the dedicated section below. Line 7b (SSN / ITIN / EIN of responsible party): the responsible party's US tax ID, or "FOREIGNUS" if they have no US tax ID. Non-resident founders typically write "FOREIGNUS" here. The IRS accepts this convention; do not write a foreign tax ID number in this field unless the field is renamed in a future SS-4 revision.
Line 8a (Is this application for an LLC?): Yes. Line 8b (Number of LLC members): 1 for single-member, 2+ for multi-member. This field drives the IRS default tax classification — single-member defaults to disregarded entity, multi-member defaults to partnership. Line 8c (Was the LLC organized in the US?): Yes for US-formed LLCs. Line 9a (Type of entity): check "Other" and write "Disregarded Entity — Sole Proprietor" for single-member LLCs that will keep default classification, or "LLC — taxed as partnership" for multi-member, or "LLC — electing S-corp" / "LLC — electing C-corp" as applicable. This field is informational — actual classification follows Form 8832/2553 elections.
Line 10 (Reason for applying): check "Started new business" for a freshly-formed LLC, or "Banking purposes" if obtaining EIN for an existing LLC primarily to open a bank account, or "Purchased going business" for acquisitions. Be honest — this field is used for IRS statistical purposes and minor classification but is not a basis for rejection. Line 11 (Date business started): the LLC's formation date from the state filing, formatted MM/DD/YYYY. Line 12 (Closing month of accounting year): December for calendar-year LLCs (the default for nearly all small LLCs).
Line 13 (Highest number of employees expected): 0 for non-employer LLCs; the actual number for hiring LLCs. Line 14 (Do you expect employment-tax liability of $1,000 or less): Yes if no W-2 employees planned; this opts the LLC into annual Form 944 filing instead of quarterly Form 941. Line 15 (First date wages paid): blank if no employees planned. Line 16 (Principal business activity): one of the IRS NAICS-based categories (construction, real estate, finance, etc.). Line 17 (Specific products/services): one sentence describing what the LLC does — "software-as-a-service for restaurant operators," "wholesale electronics import," "real estate holding."
Line 18 (Has applicant ever applied for an EIN before): No, unless the responsible party previously controlled another entity that had an EIN. Third-party designee block: signed by the authorized representative submitting the SS-4 on behalf of the LLC; the designee receives the CP 575 letter and may answer IRS questions for 90 days. Signature block: signed by the responsible party (or the third-party designee if a designee is named). For a deeper walkthrough including state-specific edge cases, see the online vs fax channel guide and the responsible party cluster.
Non-residents without an SSN or ITIN cannot use the IRS online portal — the system rejects the SS-4 at line 7b. The fax channel is the only practical route. The workflow: (1) prepare Form SS-4 with the responsible party listed (the non-resident founder), writing "FOREIGNUS" in line 7b; (2) sign and date the form; (3) optionally add a third-party designee in the lower block to authorize a US-based representative to receive the CP 575; (4) fax to the IRS international number +1-304-707-9471; (5) wait 4–6 weeks for the CP 575 letter to arrive at the mailing address listed in line 4a.
The third-party-designee option is the recommended pattern for non-resident founders who lack a US mailing address. Without a designee, the IRS mails the CP 575 to the foreign address — which can take an additional 4–6 weeks of international postal transit and risks loss or damage. With a designee, the CP 575 arrives at the designee's US address (typically the registered agent or the formation service), can be scanned and delivered electronically to the founder, and provides a paper-trail backup. Anonymousllc.co clients receive the CP 575 via secure portal within 24 hours of IRS issuance.
Common non-resident SS-4 errors that trigger IRS rejection: (1) writing a foreign tax ID number in line 7b instead of "FOREIGNUS" — the IRS Cincinnati service center has occasionally rejected this even though some prior IRS guidance suggested foreign TINs were acceptable, so the safe convention is "FOREIGNUS"; (2) mismatching the LLC's legal name on line 1 with the state formation filing (capitalization, "LLC" vs "L.L.C.", company-suffix variations); (3) signing without a date or with a future date; (4) listing a foreign country in the wrong field — the country name belongs at the end of line 4b after city/state, not as a separate line item.
Documentation backup for non-resident filings: keep a copy of the state-filed articles of organization showing the LLC's exact legal name and formation date, a copy of the operating agreement establishing the founder as responsible party, and a copy of the founder's passport identification page for the responsible party verification. The IRS does not require these documents in the SS-4 packet but may request them in a follow-up notice (typically Notice LP 47) if the application is flagged for review. Having the documents ready accelerates the response.
The fax-channel turnaround can be unpredictable. The IRS publishes a 4–6 week estimate but the Office of the Taxpayer Advocate has reported actual processing times of 6–10 weeks during 2023–2025 backlogs. There is no expedite mechanism. Calls to the IRS international taxpayer line +1-267-941-1099 are sometimes used to check status; the IRS will confirm receipt of a faxed SS-4 if the responsible party's name and the fax-date are provided, but will not assign the EIN over the phone for non-resident applicants. Patience is the only option.
For founders who need the EIN faster than the fax timeline allows, three workarounds: (1) form the LLC with a US-resident co-member (often a US-citizen spouse) — the co-member can be the responsible party and use the online portal for same-day EIN issuance; (2) use a US-resident registered agent who is also a responsible-party-eligible party with their own SSN (Anonymousllc.co does not provide this — it would compromise client control); (3) plan the formation timeline backward from when the EIN is needed for banking. Most non-resident founders accept the fax timeline and plan accordingly. See the non-resident EIN cluster for the country-specific edge cases.
The IRS requires every EIN application to name a "responsible party" — defined in the Form SS-4 instructions and IRS Notice 2014-19 as the individual who has "a level of control over, or entitlement to, the funds or assets in the entity that, as a practical matter, enables the individual, directly or indirectly, to control, manage, or direct the entity and the disposition of its funds and assets." For single-member LLCs, the responsible party is the sole member by default. For multi-member LLCs, it is whichever member the members designate — typically the managing member or the largest economic owner.
The responsible party must be an individual, not an entity. A trust, LLC, or corporation cannot serve as responsible party. This rule prevents the use of layered entities to obscure ultimate control. Where the LLC is owned by another LLC or by a trust, the responsible party is the individual who controls the parent entity — typically the manager of the parent LLC or the trustee of the trust. Anonymousllc.co's holding-company structures (covered at /holding-company/) list the ultimate human controller as responsible party for each entity in the chain.
The responsible party's information appears only in the IRS internal database, protected by IRC § 6103. It is not on any state filing, not in the BOI database (currently exempt for domestic entities under the March 2025 FinCEN interim rule — see BOI Reporting pillar), and not in any public registry. The bank's customer-identification record under Bank Secrecy Act § 5318(l) collects responsible-party information at account opening but does not publish it. Anonymity at the state level remains intact even when the responsible party is named to the IRS.
When the responsible party changes — owner sells the LLC, manager resigns, trustee changes — the IRS requires Form 8822-B (Change of Address or Responsible Party — Business) filed within 60 days of the change. Failure to file does not change the EIN itself but creates an outdated IRS database record that can complicate future correspondence and may trigger penalty exposure under § 6109 if the IRS attempts to contact the named responsible party who no longer controls the entity. Form 8822-B is single-page, paper-only, and filed with the IRS service center listed in the instructions based on the LLC's state.
Practical scenarios for responsible-party changes: (1) sale of the LLC — the buyer becomes the new responsible party and files Form 8822-B; the EIN continues with the entity. (2) death of the responsible party — the new controlling member, manager, or executor files Form 8822-B reporting the change and may need to provide documentation if the IRS challenges the succession. (3) resignation of a manager-non-owner — if the original responsible party was the manager but the owners retain ultimate control, the owners designate a new responsible party (typically a new manager or one of the owners) and file Form 8822-B.
The responsible-party-per-day throttle: each individual can be the responsible party for only one EIN application per business day through the online portal. The fax channel does not have a published per-day limit but the IRS reserves the right to flag high-volume responsible parties for review under § 6109. Serial entrepreneurs forming multiple LLCs typically use one responsible party for each entity or stagger applications across days. Service providers acting as third-party designees do not have to be the responsible party — the designee role is a submission convenience, not a control role.
The CP 575 is the IRS's official EIN confirmation letter, sent to the address on Form SS-4 shortly after EIN issuance. It contains the assigned EIN, the entity's legal name, the mailing address on file, the assignment date, and confirmation of the filing requirements based on the SS-4 elections. Banks, lenders, accountants, and merchant processors typically request the CP 575 as proof of EIN. Keep the CP 575 in a secure location indefinitely — it is the only official original copy the IRS will ever send.
The IRS does not re-issue CP 575 if lost. This is the single most important operational fact about EIN management. If the CP 575 is lost, destroyed, or never received, the only IRS substitute is a 147C letter — a verification letter generated when the responsible party calls the IRS Business and Specialty Tax Line at +1-800-829-4933 (US) or +1-267-941-1099 (international) and requests EIN verification. The 147C is faxed or mailed in 1–2 business days but is labeled as a verification rather than original confirmation.
Most banks accept the 147C as substitute proof of EIN, but some — particularly larger banks with strict KYC checklists like Chase and Bank of America — sometimes push back. The workaround: provide the 147C along with the LLC's articles of organization (showing entity name and formation date) and the operating agreement (showing responsible party). The combined package usually clears even strict bank intake. For non-resident founders, calling the IRS for a 147C requires speaking with the IRS international line during US business hours and providing verification information — the responsible party's name, the LLC's legal name and address, and the date of EIN application.
The 147C request can be made by the responsible party, an authorized officer of the LLC, or a third-party representative with Form 2848 (Power of Attorney) on file. Without a Form 2848, the IRS will not release EIN verification to non-responsible-party callers. Anonymousllc.co does not retain Form 2848 authority over client EINs by default — clients control their EIN and can request 147C themselves. Some clients add Anonymousllc.co as Form 2848 designee specifically for IRS communication; that is an opt-in service.
CP 575 storage best practices: scan the original to a secure cloud location (1Password, Notion, encrypted folder), share access only with the founder and any necessary advisors (accountant, attorney, banker), and keep the paper original in a fireproof safe. Never email the unencrypted CP 575 — it contains the EIN and responsible-party identification that can be used for identity-fraud opening of credit accounts in the LLC's name. The CP 575 is to your LLC what an SSN card is to an individual.
Lost CP 575 with no 147C alternative possible (responsible party unreachable, entity in dispute): the IRS provides no further recourse — the EIN remains assigned and valid, but no verification letter can be obtained. Some banks will accept a written affidavit from the responsible party with EIN, formation documents, and an explanation; others will require the LLC to obtain a new EIN under a new responsible party, which creates a tax-classification reset and requires careful handling of historic filings. Avoid this scenario by treating the CP 575 as a high-value document from day one.
No, not in the public-records sense. The IRS keeps EIN application data confidential under IRC § 6103 — the same statute that protects all federal tax information. Unauthorized disclosure of return information by federal employees is a felony under § 7213, punishable by up to five years' imprisonment. The responsible party's name, address, and tax identification number from Form SS-4 are not published, are not shared with state secretaries of state, and are not part of any public database. Anonymity at the state-filing level (via Wyoming, Nevada, New Mexico, or Delaware formation with no member disclosure) is preserved.
The EIN itself sometimes appears semi-publicly. State annual reports occasionally request EIN as part of the business identification block — Wyoming does not, Delaware does not for LLCs, Nevada requires it on the State Business License application, New Mexico does not. State business licenses, sales-tax permits, and payroll-tax registrations all collect the EIN. None of these state filings reveal the responsible party's identity — they identify the LLC, which is already public via the formation filing.
Bank Secrecy Act compliance is the channel where the responsible party's identity is collected, but not published. Under 31 CFR § 1020.220, banks must collect Customer Identification Program (CIP) data on the responsible party and any 25%+ beneficial owner at account opening. The bank holds this data in its KYC files, makes it available to FinCEN on suspicious-activity-report subpoenas, and may share with auditors and regulators in confidential supervision — but does not publish, sell, or share with state agencies or the IRS for any non-tax purpose. The bank's customer file is private.
The asymmetry that makes EIN + Wyoming-formation a practical anonymity structure: state filings are public by design and Wyoming's filing form does not require member disclosure — only the registered agent's name. IRS filings are private by statute under § 6103. Bank account opening is private by regulation but the responsible party's identity is recorded at the bank. End state: a non-resident founder forming a Wyoming LLC with Anonymousllc.co as registered agent, obtaining EIN via fax with the founder as responsible party, and opening a Mercury or Relay business bank account, has: zero public exposure of the founder's identity at the state filing layer, IRS knowledge of the founder's identity but legally protected from disclosure, bank knowledge of the founder's identity but confidentially held under CIP rules.
Edge cases where anonymity can break: (1) the LLC is sued and the founder is required to disclose ownership in discovery — § 6103 does not prevent court-ordered disclosure; (2) the LLC is the subject of a federal investigation — the IRS, FinCEN, and DOJ can subpoena the SS-4 and bank records under specific legal authority; (3) the founder voluntarily discloses ownership in public materials (LinkedIn, podcast interviews, court filings) — voluntary disclosure waives whatever privacy protections existed; (4) the LLC files with the SEC or qualifies under a public-company regulation — registration triggers public disclosure.
For founders specifically optimizing for anonymity, the EIN application is not a leak point — but the bank account opening, the payment processor onboarding (Stripe, PayPal require beneficial-owner identification), and the registered-agent quality (whether the agent will accept service of process discreetly) all matter. See the LLC Privacy pillar for the full anonymity stack and the Anonymous LLC pillar for the formation-side decisions.
An EIN unlocks credit applications, merchant accounts, vendor accounts, and tax filings — making EIN compromise functionally equivalent to identity theft against the LLC. Reported cases of EIN-based business identity fraud have risen sharply since 2020 according to IRS criminal investigation reports, with fraudsters using stolen EINs to open business credit cards, file fake employer tax returns to claim refunds, and create fraudulent vendor relationships. Protecting the EIN is now a serious operational discipline.
Five practical EIN security controls. (1) Limit EIN disclosure: provide the EIN only to parties with a legitimate business need — your bank, your accountant, your payroll processor, payors who need it for 1099 reporting. Do not include the EIN in marketing materials, invoices to general customers, or public-facing documents unless legally required. (2) Use encrypted channels for transmission: send EIN documents only via encrypted email, password-protected PDFs, or secure portals. Never SMS the EIN, never email it in plain text alongside the LLC's legal name and bank-account information.
(3) Monitor IRS notices: any unexpected IRS correspondence regarding the LLC — particularly notices indicating tax returns filed, refund processed, or payroll tax due — that the LLC did not initiate is a red flag for EIN-based fraud. Respond to IRS notices within 30 days, do not ignore them. (4) Monitor business-credit reports: pull Dun & Bradstreet (DUNS) and Experian Business reports annually. Unexpected credit accounts under the LLC's name and EIN indicate fraud and require immediate dispute with the bureau and the relevant creditor.
(5) Use IRS IRIS or e-Services for tax filing: setting up an IRS e-Services account with multi-factor authentication for the responsible party adds a layer of fraud detection — the IRS sends MFA alerts on filing-related events. The Identity Protection PIN (IP PIN) program is currently individual-only, not entity-level, but the IRS Tax Identity Theft hotline +1-800-908-4490 handles business EIN compromise reports.
Bank-account-level controls: enable positive pay and ACH filters on the LLC's business bank account, require dual authorization for wire transfers above a threshold, and set up notifications for every account event. Most modern business banks (Mercury, Relay, Brex) include these as default; legacy banks (Chase, Bank of America) require manual enrollment. Set notification thresholds low — every successful login, every wire initiation, every new payee added.
If EIN compromise is detected: (1) contact the IRS Identity Protection Specialized Unit at +1-800-908-4490 immediately; (2) file a complaint with the FBI's Internet Crime Complaint Center (IC3); (3) freeze affected bank accounts and merchant processors; (4) pull all three business credit bureau reports and dispute fraudulent accounts; (5) consider engaging counsel for any tax filings affected. Recovery from EIN-based fraud typically takes 6–12 months and requires sustained IRS and bureau correspondence. The cost of prevention is far lower than the cost of recovery.
The IRS rejects Form SS-4 applications at modest rates — published statistics indicate roughly 5–8% of submissions are rejected or sent back for additional information. Rejection comes via IRS Notice LP 47 (request for additional information) or, in some cases, simply by silence followed by re-submission requests. Understanding the top rejection causes accelerates the path to issuance.
Reason 1: Entity name mismatch with state filing. The legal name on SS-4 line 1 must match exactly the name on the state articles of organization — including punctuation, "LLC" vs "L.L.C." suffix, capitalization. The IRS cross-checks against state secretary-of-state databases through electronic feeds. Fix: pull the certified copy of articles from the state, copy the name character-for-character into line 1.
Reason 2: Responsible party's TIN field blank or invalid. Line 7b must contain an SSN, ITIN, EIN of a parent entity (if the parent is the responsible party — not applicable to LLCs where responsible party must be individual), or "FOREIGNUS" for non-residents. Foreign tax IDs in line 7b can trigger rejection. Fix: use "FOREIGNUS" for non-residents; verify SSN/ITIN format (XXX-XX-XXXX) for US residents.
Reason 3: Conflicting entity type and member count. Line 8a (LLC? Yes/No) and Line 8b (number of members) must align with line 9a (type of entity). A single-member LLC marked as "Other — Partnership" on line 9a will be flagged. Fix: single-member LLCs use line 9a "Other — Disregarded Entity Sole Proprietor"; multi-member LLCs use "Other — LLC taxed as partnership"; LLCs electing corporate status use the corresponding corp designation.
Reason 4: Multiple EINs for the same responsible party in same day. The IRS one-per-day throttle rejects the second and subsequent SS-4 from the same responsible party. Fix: stagger applications across business days, or rotate responsible party (within control-rules constraints) for multiple-LLC formations.
Reason 5: Signature block incomplete. The signature must be the responsible party's actual signature (handwritten or DocuSign electronic) with date — typed names without signature are rejected. Fix: print, sign, date, then fax; or use DocuSign with full audit trail.
Reason 6: Bad fax transmission. Faxed SS-4 with illegible characters, missing pages, or transmission errors is rejected. Fix: use a quality fax service (eFax, HelloFax, RingCentral), verify successful transmission via confirmation page, retain the confirmation as proof of filing date. If the IRS sends Notice LP 47 within 30 days of fax, resubmit promptly — the original fax date can be preserved as the filing date if the LP 47 response is timely.
For fax channel applications by non-residents, expect higher scrutiny on responsible-party verification. The IRS occasionally requests passport copies or other identity verification via Notice LP 47. Respond within the deadline stated on the notice (typically 30 days), include the requested documents, and reference the original SS-4 fax date for filing-date preservation. Anonymousllc.co's $99 EIN service includes re-submission of rejected applications at no additional cost. See the online vs fax channel guide for channel-specific edge cases.
EIN application varies by entity type. LLCs file Form SS-4 with the disregarded-entity / partnership / S-corp / C-corp classification choice on line 9a. C-corporations file Form SS-4 with "Corporation" on line 9a; the EIN is required from day one. S-corporations apply the same as C-corps then file Form 2553 separately for S-election. Sole proprietorships can use the owner's SSN for tax filing but may apply for an EIN for banking or payroll purposes — line 9a "Sole proprietor."
Partnerships (general partnerships, limited partnerships, LLPs not classified as LLCs) file with "Partnership" on line 9a. Nonprofits file with "Other — Nonprofit Organization" plus the specific designation (church, charitable, educational); the EIN is the prerequisite for IRS Form 1023 exemption application. Estates of deceased individuals file with "Estate" on line 9a after death; the EIN is required for the estate's separate tax return (Form 1041).
Trusts have nuanced treatment. Grantor trusts where the grantor is treated as owner under IRC §§ 671–678 do not need a separate EIN — income is reported on the grantor's SSN. Non-grantor trusts, irrevocable trusts after the grantor's death, and trusts with multiple beneficiaries typically need an EIN to file Form 1041. Form SS-4 line 9a "Trust" with the specific subtype (revocable, irrevocable, testamentary, charitable remainder). Line 3 (executor/administrator/trustee name) is used for trusts — the trustee is listed here, and the responsible party in line 7a is the trustee or grantor depending on the trust type.
For non-resident structures combining LLCs with trusts (a common asset-protection pattern — see /asset-protection-llc/), each entity has its own EIN. An LLC owned by a DAPT has one EIN for the LLC and a separate EIN for the trust (if non-grantor). Cross-referencing the entities in the operating agreement and the trust instrument keeps the IRS records aligned. Holding-company structures (see /holding-company/) have one EIN per LLC in the chain — the parent LLC, each subsidiary LLC.
Foreign entities operating in the US sometimes need US EINs even if they are organized abroad. A UK Ltd operating a US branch, a Dutch BV opening a US bank account, or a Cayman LP investing in US real estate — all may need EIN. The entity classification on line 9a is "Foreign Entity" or the specific foreign form. The fax channel is used (online portal does not accept foreign entities). This is distinct from a US-formed LLC owned by non-residents, which is a domestic entity for EIN purposes.
One EIN is permanent per entity. Changes that do NOT require a new EIN: name change (file Form 8822-B), address change (file Form 8822-B), classification change (file Form 8832 or 2553), responsible-party change (file Form 8822-B), state-of-formation change via domestication. Changes that DO require a new EIN: conversion from LLC to corporation as a separate entity (not just a classification election), partnership terminating and reforming, sole proprietorship incorporating as new corporation. The IRS guidance on when new EIN is required is published at irs.gov/businesses/small-businesses-self-employed/do-you-need-a-new-ein. See the CP 575 cluster for the ongoing entity-management workflow.
Mistake 1: Using the EIN for personal tax filing instead of business filing. The EIN identifies the LLC, not the owner. Single-member disregarded LLCs file Schedule C on the owner's personal Form 1040 using the owner's SSN — not the LLC's EIN — in the Form 1040 identification block. The EIN appears on Schedule C in the business-identification line, but the personal return is keyed off the SSN. Reversing this triggers IRS matching errors and possible processing delays.
Mistake 2: Treating a single-member LLC like a corporation for tax purposes. The disregarded-entity default means the IRS does not expect a separate business income tax return for a single-member LLC. Owners who file a Form 1120 or 1120-S for a default single-member LLC create a classification mismatch — the IRS has no record of a Form 8832 or 2553 election placing the LLC in corporate status. Resolution requires either filing the election retroactively (Rev. Proc. 2013-30 for S-corps) or amending the erroneous return.
Mistake 3: Letting the LLC and EIN go inactive without filing required returns. EINs do not expire — once issued, they remain assigned to the entity indefinitely. But annual filing obligations continue. A multi-member LLC that stops operating but does not formally dissolve still owes Form 1065 with $245-per-month-per-partner penalties under § 6698 for late filing. A non-resident-owned single-member LLC still owes Form 5472 with the $25,000 penalty. Operating-by-default-only LLCs need either active dissolution or zero-activity filing through the dormant period.
Mistake 4: Forgetting to file Form 8822-B for responsible-party or address changes. The IRS mails all correspondence to the address on file — including penalty notices, audit letters, and refund-related communications. Stale addresses mean missed deadlines, missed notices, and compounded penalties. Form 8822-B takes 5 minutes to complete and is required within 60 days of any change under § 6109. Failure to file does not generate immediate penalties but creates downstream exposure when IRS notices are missed.
Mistake 5: Sharing the EIN with anyone who claims to need it. Phishing scams targeting LLC owners have increased — fake IRS letters, fake vendor onboarding requests, fake bank verification calls all attempt to extract the EIN for identity-fraud purposes. The IRS never initiates contact by email or text. Vendors with legitimate need for the EIN (for 1099 reporting) accept it via W-9 form, not phone calls. Banks verify EIN through documented onboarding workflows, not unexpected calls. When in doubt, verify the request through an independently sourced phone number for the requesting entity.
Bonus mistake: obtaining a new EIN unnecessarily for events that do not require it. Some founders apply for new EINs after relocating the LLC to a new state through domestication, after changing tax classification with Form 8832, or after changing managers — none of which require a new EIN. The EIN follows the entity. Filing a new SS-4 for the same entity creates duplicate IRS records that must be reconciled with Form 8822-B and may delay tax processing for years. Always check the IRS "Do You Need a New EIN" guidance before applying. See the EIN lookup cluster for tools to verify your existing EIN before applying for a new one.
The EIN is structurally separate from LLC formation but operationally bundled in most service packages. Anonymousllc.co's formation packages include EIN at no extra charge: Anonymous LLC formation $397 all-in (Wyoming-fulfilled), Wyoming standalone $397, New Mexico $347, Delaware $407, Nevada $722. The EIN is filed via fax through Anonymousllc.co's third-party-designee workflow within 1–2 business days of formation and delivered via secure portal once the IRS issues the CP 575 (4–6 weeks typical).
For founders who already have an LLC but no EIN — either because they formed via a different provider that did not include EIN, or because they obtained the LLC years ago and never needed an EIN until banking became a requirement — the EIN standalone service is $99 flat. Same workflow as the bundled service: SS-4 preparation, third-party-designee fax to IRS, CP 575 delivery via secure portal. No formation or registered-agent service required.
The EIN + ITIN combo at $349 saves $49 vs purchasing separately ($99 EIN + $299 ITIN = $398). The combo makes sense for non-resident founders who know they will need both — the LLC needs the EIN for banking, and the founder personally needs the ITIN for tax filing (Form 5472 doesn't require ITIN, but Form 1040-NR does if there is US-source income, and certain banks/payors require ITIN for the personal verification). See the ITIN pillar for the personal-tax-ID workflow.
The 4–6 week IRS processing time for fax-channel EIN applications is not controllable. Service providers including Anonymousllc.co cannot expedite IRS processing — the IRS does not offer a paid expedite for EIN, unlike state-level formation filings where many states offer rush processing for additional fees. Founders who need an EIN urgently for banking should either use the online portal (if eligible — US-resident with SSN/ITIN), accept the fax timeline, or form with a US-resident co-member who can use the online portal.
Pricing comparison with other EIN service providers: most offer EIN-only at $50–$150 with similar workflows. Some include 60-day money-back guarantees; some charge for expedite-impossible "rush" filings (avoid these — the IRS does not offer expedite, so the rush fee buys nothing). Anonymousllc.co's $99 flat rate is competitive and includes re-submission of rejected applications, CP 575 delivery via secure portal, and a 90-day support window for any IRS follow-up questions about the application.
For LLCs with complex structures — holding-company chains, foreign-parent ownership, multi-entity series LLCs — the EIN workflow scales with the number of entities. Each entity needs its own SS-4, its own responsible party (subject to the one-per-day throttle), and its own CP 575 management. Anonymousllc.co's multi-entity formation engagements stage the EIN applications across business days to avoid the throttle. See the EIN service page for engagement specifics and the Holding Company pillar for multi-entity structures.
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