Table of contents
- Does a series LLC need 1 EIN or 1 EIN per series?
- What is a series LLC?
- What has the IRS said about series LLC EINs?
- Which series needs its own EIN?
- What name goes on Form SS-4 for a series?
- How does a series LLC get an EIN without an SSN?
- What does a foreign-owned series LLC file every year?
- Why do series LLC EIN applications get rejected?
- Which states authorize a series LLC?
- How many federal filings does each series LLC EIN add?
- Who should pay anyone for a series LLC’s EIN?
A series LLC starts with 1 EIN, issued to the master LLC on Form SS-4. A series takes its own EIN once it files an employment tax return, files an excise tax return, files its own income tax return, or opens a bank account in its own name. The IRS proposed in 2010 that every domestic series be treated as a separate entity for federal tax purposes, and never finalized that rule, so the trigger list above is what actually decides the count. Each EIN costs $0 from the IRS and never renews.
Updated July 2026
This page is the hub for 5 deeper walkthroughs: whether every series needs its own EIN, how Delaware, Texas, Nevada and Illinois differ, the cost against separate LLCs, bank accounts per series, and Form SS-4 for a protected series.
The series LLC is the one structure where the EIN question has no single settled answer, and pretending otherwise helps nobody. State law says a series is walled off from its siblings. Federal tax law has held a proposal open since 2010 and finalized nothing. This page maps what is actually decided, what is not, and the 4 triggers that turn the question from theory into a Form SS-4 you have to send. If your LLC has 1 member and no series at all, start with ein for single member llc instead, and if you are weighing whether a solo LLC has to file at all, does a single member llc need an ein walks each trigger. A spouse-owned series raises the same community-property wrinkle covered on husband and wife llc ein.
Does a series LLC need 1 EIN or 1 EIN per series?
A series LLC needs at least 1 EIN, issued to the master LLC. Each series that files its own tax return, hires employees, or opens a bank account in its own name obtains its own EIN.
The master LLC is the entity the state registered, and that entity applies first. One Form SS-4, one 9-digit EIN, one CP-575 letter carrying the exact legal name from the Articles of Organization. That number is the anchor for every filing the structure makes while every series stays inside it.
The count grows from function, not from the number of series on paper. A series LLC that holds 6 properties in 6 series, banks all rent into a single master account, and reports every dollar on 1 return, runs on 1 EIN. A series LLC with 3 series, each with its own lease, its own bank account, and its own bookkeeping, runs on 4 EINs: the master plus 3.
Nothing about creating a series generates an EIN automatically. The IRS assigns EINs in response to a Form SS-4, one form per number, and no state filing for a series reaches the IRS. Owners who assume the state filing created a federal record discover the gap at the bank counter, when the account application asks for a CP-575 that does not exist.
Cost is not the constraint on the count. The IRS charges $0 for each EIN, an EIN never renews, and year 2 and every year after costs $0. The constraint is the filing and record-keeping load each additional EIN carries, which repeats annually for the life of the series.
What is a series LLC?
A series LLC is 1 state-registered LLC that creates internal series, each holding separate assets, members, and liabilities. Delaware authorizes the structure under Delaware Code title 6 section 18-215, 1 of at least 10 state statutes.
The structure exists to wall off risk without paying to register a separate company for every asset. A real estate owner with 5 buildings forms 1 LLC and creates 5 series, so a judgment against series 3 reaches the assets of series 3 and stops there. That liability wall is a matter of state statute, and it depends on the series keeping separate records, separate accounts, and a name that identifies it.
A series is created inside the operating agreement, and in some states also by a filing with the Secretary of State. Illinois requires a certificate of designation for each series under 805 ILCS 180/37-40. Delaware permits a registered series to be formed by filing a certificate of registered series. Texas creates series through the company agreement under Business Organizations Code section 101.601.
Federal tax law and state liability law disagree about what a series is, and that disagreement is the whole reason this page exists. A state can say a series is a distinct legal person for liability while the Internal Revenue Code holds no final rule on whether it is a distinct taxpayer. The EIN question sits exactly on that seam.
A series LLC is not a corporation, not a partnership by default, and not a separate formation for each asset. Owners comparing it with 5 standalone LLCs are comparing 1 state registration against 5, and 1 annual state report against 5, against a liability shield that has fewer decades of case law behind it.
What has the IRS said about series LLC EINs?
The IRS proposed in 2010 that each domestic series be treated as a separate entity for federal tax purposes. That proposal, REG-119921-09, has never been finalized, so no final regulation governs series classification.
The proposed regulations were published on September 14, 2010, in the Federal Register at 75 FR 55699. Under them, a domestic series is treated as an entity formed under local law, separate from the master LLC and from every other series, and each series then classifies itself under the check-the-box rules in Treasury Regulation section 301.7701-3.
More than 15 years later, the proposal remains proposed. That is unusual, and it is why every honest answer on this topic ends in a decision rule rather than a citation. Nobody publishes a final rule, so the practical test is whether a given series has a filing obligation of its own.
The check-the-box logic still supplies the defaults. A series with 1 member is a disregarded entity, a series with 2 or more members is a partnership filing Form 1065, and either can elect corporate treatment through Form 8832 or S corporation treatment through Form 2553. Those are the same 3 lines on Form SS-4 that decide any LLC: 8a, 8b, and 9a.
The IRS assigns an EIN to anyone who requests one on a properly completed Form SS-4 and states a valid reason on line 10. It does not adjudicate whether the requester needed the number. That means a series can obtain an EIN before the classification question is settled, and the number does not lock the classification permanently.
Which series needs its own EIN?
A series needs its own EIN when it files an employment tax return, files an excise tax return, files its own income tax return, or opens a bank account in its own name. Those are the 4 triggers.
Employment tax is the hardest trigger. Form 941 is filed per EIN, every quarter, and every Form W-2 carries the EIN of the employer that paid the wages. A series with 2 employees on its own payroll files under its own number, because the alternative reports those wages under the master LLC and misstates who the employer is.
Banking is the trigger owners meet first. A bank opening an account titled to a series verifies 3 documents in order: the state formation record, the CP-575 letter showing the 9-digit EIN, and the operating agreement naming the series and its authorized signer. No CP-575 in the series name means no account in the series name.
A separate income tax return forces a separate number. A series with 2 outside members filing its own Form 1065, due March 15, files under its own EIN, and each Schedule K-1 it issues carries that same number. A series that reports through the master on a single return has no such requirement.
Excise tax works the same way. Form 720 is filed per EIN, and a series liable for a federal excise tax files under its own. Absent all 4 triggers, a series operating inside the master's books, banking through the master's account, and reporting on the master's return has no federal need for a second EIN.
| Situation | Own EIN | What it files | Why |
|---|---|---|---|
| Series has its own employees | Yes | Form 941 each quarter, Form W-2 each January | Filed per EIN |
| Series files its own Form 1065 | Yes | Form 1065 by March 15, Schedule K-1 per member | Filed per EIN |
| Series owes federal excise tax | Yes | Form 720 | Filed per EIN |
| Series opens its own bank account | Yes | CP-575 in the series name | Bank requirement |
| Foreign-owned series, treated separately | Yes | Form 5472 + pro-forma Form 1120 | $25,000 per entity |
| Series holds assets, reports on master return | No | Reported inside the master LLC's return | Master EIN |
| Series created but dormant | No | Nothing | Master EIN |
Source: IRS Form SS-4 instructions, Form 941, Form 720, Form 1065 and Form 5472 instructions, and Internal Revenue Code section 6038A, verified July 2026.
What name goes on Form SS-4 for a series?
Line 1 takes the series name exactly as the operating agreement and the state record write it, character for character. The IRS stores that name against the EIN and matches every later return and bank record against it.
Series names carry more punctuation than ordinary LLC names, and punctuation is where applications break. An entity approved as ABC Holdings LLC – Series A is not ABC Holdings LLC Series A, and neither is ABC Holdings, LLC, Series A. Copy the string from the state record, then read it back one character at a time before the form goes anywhere.
Line 2 holds a trade name when the series operates under one, and it does not replace line 1. Line 3 holds an executor, administrator, or trustee name, and stays blank for almost every series. Line 4 and line 5 hold the mailing and street addresses, and a foreign address is accepted in both.
Line 8a asks whether the application is for a limited liability company, and the answer is Yes for a series as well as for the master. Line 8b takes the number of members of that series, not of the master LLC. Line 9a takes the entity type the series will be treated as.
Line 10 asks the reason for applying, and the honest entries for a series are banking purpose, hired employees, or started new business. Line 11 takes the date the series started or acquired assets, and line 12 sets the closing month of the accounting year, which fixes that series' filing deadline for the rest of its life.
How does a series LLC get an EIN without an SSN?
Form SS-4 line 7b accepts the entry Foreign in place of an SSN or ITIN. The completed form goes by fax to 855-641-6935 for a US-based entity, or 855-215-1627 from outside the United States.
The IRS online assistant at irs.gov requires the responsible party on line 7b to hold an SSN or ITIN, and it holds no series LLC option. An applicant without one takes the fax route instead, which accepts the same Form SS-4 and produces the same 9-digit EIN and the same CP-575 letter.
Line 7a takes the responsible party's name, and line 7b takes Foreign. No passport, no visa, and no US visit is part of the application. The IRS asks for a name and a status on line 7b, and Foreign is a valid status.
A series LLC applying for several EINs sends 1 Form SS-4 per number, each with its own series name on line 1 and its own member count on line 8b. Sending a single form listing 3 series produces 1 EIN attached to whichever name sits on line 1, which is not what the applicant wanted.
The IRS international phone line is 267-941-1099 for applicants outside the United States who want to confirm status. The fax route costs $0 from the IRS in every case, whether the applicant sends 1 form or 4.
What does a foreign-owned series LLC file every year?
Each series treated as a separate disregarded entity with a foreign owner files Form 5472 with a pro-forma Form 1120 every year. A missed filing carries a $25,000 penalty for that entity.
The penalty sits in Internal Revenue Code section 6038A, and it attaches per reporting entity per year. A foreign-owned structure with a master LLC and 4 series treated as separate entities carries 5 annual filings and $125,000 of exposure in a single year if every one is missed. That arithmetic is the reason this page treats the EIN count as a compliance decision rather than a paperwork preference.
Form 5472 reports reportable transactions between the entity and its foreign owner, and the definition is wide. Money the owner wires in to fund a series, money the series sends back, amounts booked between series, and amounts paid to a related foreign company are all reportable. A year with $0 of profit and 1 capital contribution still produces a filing.
Each of those filings is made under an EIN. A series with no EIN and a Form 5472 obligation has a filing it cannot make, which is the clearest single case for obtaining a number before the year closes rather than after.
A series with 2 or more members and foreign owners files Form 1065 instead, with withholding duties on effectively connected income sitting on top of it. Member count on line 8b of Form SS-4 decides which of those 2 paths a series lands in, for that series alone.
Why do series LLC EIN applications get rejected?
The name on line 1 of Form SS-4 fails to match the state record character for character. A series filed as Series A when the state approved Series 1 comes back rejected, and so does a missing line 7b entry.
Name mismatch is the leading cause, and series names multiply the ways to get it wrong. Hyphen against en dash, comma placement, the word Series capitalised or not, a roman numeral against an arabic one. Each of those is a different string to the IRS matching system, and only 1 of them is the approved name.
The second cause is a blank or invalid line 7b. Leaving the field empty stops the application. Writing Foreign moves it forward. Writing N/A or None is treated as incomplete.
The third cause is a member count on line 8b that contradicts the entity type on line 9a. A series entered with 1 member and classified as a partnership is internally inconsistent, and inconsistency between 8a, 8b, and 9a is what our review of every order is built to catch before the form is sent.
A rejected application costs weeks, not dollars. The IRS returns the form, the applicant corrects it, and the fax goes again from the start of the queue. The fix that prevents all 3 causes is a character-by-character comparison of line 1 against the state approval document before anything is sent.
Which states authorize a series LLC?
At least 10 US states authorize protected series by statute: Delaware, Illinois, Texas, Nevada, Tennessee, Utah, Iowa, Kansas, Oklahoma, and Wyoming. Each state sets its own registration rules, and 3 of the 10 put a series on the public record.
Registration mechanics split the list in 2. Delaware, Illinois, and Wyoming put a series on the public record through a filing with the state. The other 7 create a series inside the operating agreement, with no separate state document produced. That difference decides what a bank has to look at when a series opens an account, and it decides what document the SS-4 name on line 1 has to match.
| State | Statute | How a series is created | On the public record |
|---|---|---|---|
| Delaware | Del. Code tit. 6 § 18-215 | Registered series filed with the state | Yes |
| Illinois | 805 ILCS 180/37-40 | Certificate of designation per series | Yes |
| Texas | Tex. Bus. Orgs. Code § 101.601 | Series created in the company agreement | No |
| Nevada | Nev. Rev. Stat. § 86.296 | Series named in the operating agreement | No |
| Tennessee | Tenn. Code § 48-249-309 | Series created in the LLC documents | No |
| Utah | Utah Code § 48-3a-1201 | Series set out in the operating agreement | No |
| Iowa | Iowa Code § 489.1201 | Series set out in the operating agreement | No |
| Kansas | Kan. Stat. § 17-76,143 | Series set out in the operating agreement | No |
| Oklahoma | Okla. Stat. tit. 18 § 2054.4 | Series set out in the operating agreement | No |
| Wyoming | Wyo. Stat. § 17-29-1101 | Protected series filed with the state | Yes |
Source: the cited state statutes, verified July 2026. This list is not exhaustive, and no state statute changes the federal EIN rules on this page. State law decides the liability wall. The Internal Revenue Code decides the EIN.
State tax treatment diverges from state liability treatment as well. Texas treats a series LLC as 1 taxable entity for franchise tax and expects a combined report. Illinois treats each registered series as a separate entity for its own filing purposes. A structure operating in 2 states answers 2 different questions with 1 set of books, and the EIN count follows the federal triggers rather than either state answer.
How many federal filings does each series LLC EIN add?
Each EIN carries its own filing calendar. A series with employees adds 4 Forms 941 and 1 Form W-2 per employee each year. A foreign-owned disregarded series adds Form 5472 with a pro-forma Form 1120.
This is the arithmetic that decides whether a second EIN is worth taking. The number itself costs $0 and never renews, so the real price of EIN number 2 is the return it obliges someone to file every year for as long as that series exists. A series with its own payroll signs up for 4 quarterly Forms 941 plus a January 31 Form W-2 run, every year, forever.
| Form | Which series files it | Due | Count |
|---|---|---|---|
| Form 941 | Series with its own employees | April 30, July 31, October 31, January 31 | 4 per year |
| Form W-2 | Series that paid wages | January 31 | 1 per employee |
| Form 1065 | Series with 2 or more members | March 15 | 1 per year |
| Schedule K-1 | Issued by that series to each member | March 15, with Form 1065 | 1 per member |
| Form 720 | Series owing a federal excise tax | April 30, July 31, October 31, January 31 | 4 per year |
| Form 5472 + pro-forma Form 1120 | Foreign-owned disregarded series | April 15 | 1 per year |
| Form 1120 | Series that elected corporate treatment on Form 8832 | April 15 | 1 per year |
| Nothing | Dormant series reporting inside the master | No separate deadline | 0 per year |
Source: IRS instructions for Forms 941, W-2, 1065, 720, 5472, 1120 and 8832, verified July 2026. A due date landing on a Saturday, Sunday, or US federal holiday moves to the next business day.
Elections run per EIN as well. A series electing corporate treatment files Form 8832 within 75 days of the requested effective date, and a series electing S corporation treatment files Form 2553 within 2 months and 15 days of the start of the tax year. Each election names 1 EIN, so a structure with 4 series that all elect corporate treatment files 4 separate Forms 8832.
Put the counts together for a worked case. A master LLC with 3 active series, 1 of them running payroll for 2 employees and 2 of them foreign-owned and disregarded, holds 4 EINs and files 4 Forms 941, 2 Forms W-2, and 2 Form 5472 packages in a year: 8 federal filings the single-EIN version of the same structure would never send. Missing the 2 Form 5472 packages alone carries $50,000 in penalties under Internal Revenue Code section 6038A.
Who should pay anyone for a series LLC’s EIN?
An applicant with an SSN pays nobody. The IRS issues each EIN at irs.gov in 15 minutes for $0. An applicant without an SSN uses the fax route, also $0, or pays someone to run it.
Apply at irs.gov. The IRS online assistant charges $0 and issues the 9-digit EIN in 15 minutes, and it will do that once per day. Pay nobody, including us.
Take the fax route. Form SS-4 line 7b accepts the entry Foreign. Fax to 855-641-6935 for a US-based entity or 855-215-1627 from abroad, at $0. Or einforllc.co files it for $97, faxed within 7 business days, or $127 filed within 24 hours with the IRS call included.
Price context, so the $97 is legible. The IRS charges $0 for the EIN itself, and the EIN never renews, so year 2 and every year after costs $0. Formation companies price the EIN as an add-on: Northwest at $200 without an SSN, ZenBusiness at $99, and Rocket Lawyer at $59.99, all verified July 2026. None of those 3 publishes a written filing deadline, and none reviews the SS-4 classification lines before filing.
einforllc.co prices the EIN on its own: $97 one time on Standard, or $127 on Fast. On either tier we review the Articles of Organization character by character against line 1 and check lines 8a, 8b, and 9a against the actual structure. Standard goes out by fax within 7 business days with no IRS calls, and the EIN and CP-575 land in 16–19 business days. Fast is filed within 24 hours with the IRS phone follow-up included, and lands in 6 to 8 business days. Filed by fax within 7 business days, or that fee is refunded; on Fast, filed and the IRS call made within 24 hours, guaranteed, or that fee is refunded. Business days are Monday to Friday excluding US federal holidays. We do not create series for you, and if your LLC already exists that EIN fee is the whole invoice: formation is one optional $197 line, only for people who have not filed with a state yet, and its first-year registered agent renews at $99 a year. Support runs on live chat 24/7, a dedicated post-purchase chat, and email. That is the $97 LLC EIN specialist service in full.
What else do owners ask about EINs for a series LLC?
Owners ask 10 questions most: how many EINs a series LLC needs, whether the IRS finalized its 2010 proposal, what each EIN costs, what banks verify, which 10 states allow series, and what a foreign owner files each year.
+Does a series LLC need a separate EIN for each series?
Not automatically. The master LLC needs 1 EIN. A series takes its own EIN once it meets any of 4 triggers: it files an employment tax return, files an excise tax return, files its own income tax return, or opens a bank account in its own name. A dormant series meeting none of the 4 needs none.
+Has the IRS issued final rules on series LLC taxation?
No. The IRS published proposed regulations on September 14, 2010, under REG-119921-09, which would treat each domestic series as a separate entity for federal tax purposes. Those rules were never finalized. More than 15 years later, the practical test remains whether a given series has a filing obligation of its own.
+Can a series get an EIN before the master LLC has one?
The order is master first. The IRS issues an EIN to whichever entity submits a complete Form SS-4, so a series can technically obtain one first, but the master LLC is the registered entity every state record points at. Applying master first, then series, keeps the 2 records consistent.
+How much does an EIN cost for each series?
The IRS charges $0 for every EIN, no matter how many series apply. An EIN never renews, so year 2 and every year after costs $0 as well. einforllc.co files 1 EIN for $97, faxed within 7 business days or that fee is refunded, 16–19 business days in total. The $127 Fast tier files within 24 hours with the IRS call included, 6 to 8 business days in total.
+Does a series LLC need an EIN to open a bank account?
An account titled to the series does. Banks verify 3 documents in order: the state formation record, the CP-575 letter showing the 9-digit EIN, and the operating agreement naming the series and its signer. A series with no CP-575 in its own name gets no account in its own name.
+Which states allow a series LLC?
At least 10 US states authorize protected series by statute: Delaware under title 6 section 18-215, plus Illinois, Texas, Nevada, Tennessee, Utah, Iowa, Kansas, Oklahoma, and Wyoming. Each state sets its own registration rules, and Illinois requires a certificate of designation for every series.
+Can a series LLC get an EIN without an SSN?
Yes. Line 7b of Form SS-4 takes the entry Foreign in place of an SSN or ITIN, and the completed form goes by fax to 855-641-6935 for a US-based entity or 855-215-1627 from abroad. No passport is required at any point in the application.
+What does a foreign-owned series file every year?
Each series treated as a separate disregarded entity with a foreign owner files Form 5472 with a pro-forma Form 1120. Internal Revenue Code section 6038A carries a $25,000 penalty per entity per year for a missed filing, so a master plus 4 series carries $125,000 of annual exposure.
+Does adding a new series change the master LLC's EIN?
No. The master LLC keeps its 9-digit EIN for the life of the entity, and creating series 5 or series 20 changes nothing about that number. The EIN is attached to the registered entity, and a new series is created inside it rather than replacing it.
+How long does an EIN take for a series LLC?
An applicant with an SSN gets the EIN at irs.gov in 15 minutes, for $0. The fax route for an applicant without an SSN runs longer, which is why einforllc.co writes a filing deadline into every order: $97 filed by fax within 7 business days, or that fee is refunded, reaching 16–19 business days in total. The $127 Fast tier files within 24 hours with the IRS call included and reaches 6 to 8 business days in total.
This page states federal tax rules and state statutes current as of July 2026. Series LLC classification rests on proposed regulations the IRS has not finalized. This is not legal or tax advice. Confirm your structure with a licensed CPA or attorney before filing.
Can einforllc.co file a series LLC’s EIN?
Yes. einforllc.co files 1 Form SS-4 per EIN, for the master LLC or any series, at $97 one time. It goes out by fax within 7 business days, or that fee is refunded, and the 9-digit EIN and IRS CP-575 letter arrive in 16–19 business days. On the $127 Fast tier we file within 24 hours with the IRS call included, and they arrive in 6 to 8 business days.
Every EIN on this page starts with 1 Form SS-4 and 3 fields that decide the next 10 years: 8a, 8b, and 9a. We read your Articles character by character against line 1, set the classification to your real structure, and file to a deadline we put in writing before we file. Filed by fax within 7 business days, or that fee is refunded. On Fast, filed and the IRS call made within 24 hours, guaranteed, or that fee is refunded.
No SSN. No passport upload. · IRS fee $0 · Year 2 and beyond: $0 · get your LLC’s EIN