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You filed your articles of organization, got your approval from the state, and your LLC officially exists. Then someone tells you that you need an EIN, and suddenly there is another acronym to figure out on top of everything else you are already learning.
An EIN is one of those things that sounds more complicated than it is. Getting one is free, it takes about ten minutes if you do it online, and you only do it once. But understanding what it actually is, why you need it, when you need it, and how to avoid the handful of mistakes people make when applying for one is worth spending a few minutes on before you go to the IRS website.
This guide covers everything about EINs for LLC owners, from what they are and why they matter to exactly how to apply, what to do if something goes wrong, and the specific situations where the process is different.
What is an EIN?
EIN stands for Employer Identification Number. It is a nine-digit number assigned by the Internal Revenue Service that serves as your LLC’s tax identification number at the federal level.
The format is always two digits, a hyphen, and then seven digits. It looks like this: 12-3456789.
Despite the word “employer” in the name, you do not need to have employees to get one or to need one. The name is a holdover from when the number was primarily used to identify businesses with payroll obligations. Today it functions as a general federal tax ID for any type of business entity, regardless of whether that entity has a single member with no employees or a large company with hundreds of staff.
Think of an EIN the way you think about a Social Security Number, but for your business rather than for you personally. Just as your SSN identifies you in the tax system and shows up when you open a bank account, apply for credit, or file your tax return, your EIN identifies your LLC in the federal tax system and shows up in all of those same contexts when your LLC is the entity doing business.
Why does your LLC need one?
There are several practical reasons your LLC needs an EIN, and some of them apply even if you think your LLC is too small or too new to need it yet.
Opening a business bank account is the most immediate reason most LLC owners apply for an EIN. Almost every bank, whether a traditional brick-and-mortar institution or an online business bank, requires an EIN to open a business checking account. The bank uses it to report any interest income to the IRS and to verify the business entity. Without an EIN you cannot open a business account, and without a business account you are mixing personal and business finances, which undermines the liability protection your LLC is supposed to provide.
Filing federal taxes is the other major reason. Depending on how your LLC is structured and taxed, you will either file a Schedule C attached to your personal return, a partnership return on Form 1065, or an S-Corp return on Form 1120-S. Your EIN goes on all of these returns and on any tax payments you make to the IRS.
Hiring employees requires an EIN regardless of your LLC structure. If you bring on even one employee, you need an EIN to run payroll, withhold taxes, file quarterly payroll tax returns on Form 941, and issue W-2s at the end of the year.
Working with other businesses often triggers the EIN requirement even before you have employees. Many companies require a W-9 from anyone they pay for services. A W-9 asks for your tax identification number, which for a business is its EIN. If you are doing B2B work and your clients are large enough to send 1099s, they will need your EIN.
Applying for a business credit card is another common trigger. Business credit card applications ask for your EIN, and some issuers require it even for sole proprietors and single-member LLCs.
Getting certain business licenses and permits also requires an EIN in some states and industries. If you are applying for a contractor’s license, a liquor license, a professional license, or various other types of permits, the application will often ask for your federal tax ID number.
Does every LLC need an EIN?
Not every LLC is strictly required by the IRS to have an EIN, but in practice nearly every LLC owner ends up needing one anyway.
The IRS says a single-member LLC that has no employees and is not required to file excise taxes can use its owner’s Social Security Number instead of an EIN for federal tax purposes. Technically this is allowed.
In practice, almost nobody should do this. Using your SSN in place of an EIN for business purposes means handing out your Social Security Number to clients who request a W-9, to banks, and to vendors. Your SSN is the most sensitive piece of personal financial identification you have. Protecting it is worth the ten minutes it takes to get an EIN.
There is also the practical reality that most banks will not open a business account using an SSN even for a single-member LLC. They want an EIN. So even if you are technically exempt from needing one for tax filing purposes, you are likely to need one within the first few weeks of your LLC being active for banking purposes alone.
Multi-member LLCs are required to have an EIN because the IRS treats them as partnerships for tax purposes and partnership returns require one.
LLCs that elect to be taxed as S-Corps or C-Corps are also required to have an EIN.
The short version is: get an EIN. It is free, it takes minutes, it protects your SSN, and you are going to need it anyway.
When should you apply for an EIN?
The right time to apply for an EIN is immediately after your LLC is approved by the state.
You cannot apply for an EIN before your LLC exists. The IRS issues EINs to legal entities, and your LLC is not a legal entity until the state has accepted and processed your articles of organization. Applying before approval means you may be applying as a business that does not yet officially exist, which can create confusion or errors in your tax records.
Once your LLC is approved, there is no reason to wait. The sooner you have an EIN, the sooner you can open a business bank account, accept payments properly, and have all your business documentation in order. Applying the same day or the day after you receive your state approval is the right approach.
One common mistake is forming the LLC and then waiting weeks or months to get the EIN while already doing business, sometimes accepting payments into a personal account in the meantime. This creates a period where your finances are mixed, your liability protection may be compromised, and your tax records start life in a messy state. Avoid it by treating the EIN as part of the formation checklist rather than a separate task to get around to later.
How to apply for an EIN: the online method
The fastest and most straightforward way to get an EIN is through the IRS website. The online application is available at irs.gov and takes about ten minutes to complete.
A few things to know before you start.
The online application is only available Monday through Friday from 7am to 10pm Eastern Time. This is not a huge inconvenience but it catches some people off guard if they try to apply on a weekend or late at night.
You need to complete the entire application in one session. The IRS system does not save partial applications. If you close the browser or get timed out before finishing, you have to start over. Make sure you have a few uninterrupted minutes before you begin.
Only one EIN application per responsible party is allowed per day. The responsible party is the individual associated with the EIN, typically the LLC owner applying. If for some reason your first application does not go through and you need to reapply, you have to wait until the next day.
When you go through the application, here is what you will be asked to provide:
Your LLC’s legal name exactly as it appears on your state formation documents. Do not abbreviate or alter it.
Your LLC’s mailing address.
The state where your LLC was formed.
The name and Social Security Number of the responsible party. This is the individual who owns or controls the LLC. For a single-member LLC this is you. For a multi-member LLC this is typically one of the managing members.
The reason you are applying for an EIN, which in this case is that you started a new business.
Whether your LLC has or expects to have employees in the next 12 months.
The type of entity, which is LLC, and the number of members.
The primary activity of the business and a brief description of what your LLC does.
After you submit the application, the IRS issues your EIN immediately. You receive a confirmation page on screen that shows your EIN, and you can download and print the official EIN assignment letter, which is called the CP 575 notice. Save that document. You will need it when opening a bank account and in various other situations.
How to apply if you are a foreign national without an SSN
The online EIN application requires the responsible party to have a US Social Security Number or an Individual Taxpayer Identification Number. If you are a non-US citizen without either of those, the online application is not available to you.
Foreign nationals who own US LLCs but do not have a SSN or ITIN have two options.
The first option is to apply by fax using Form SS-4, which is the paper EIN application. You fill out the form, fax it to the IRS at the number specified in the form instructions for international applicants, and receive your EIN back by fax within four business days. Fax is genuinely how this works in 2026, and yes, the IRS still uses it.
The second option is to apply by mail using the same Form SS-4. This takes significantly longer, typically four to six weeks for the IRS to process and mail back your EIN assignment. If you are waiting on an EIN to open a bank account or start operating, four to six weeks is a long time. The fax method is faster if you have access to a fax machine or a fax service.
Some foreign LLC owners apply for an ITIN first and then use that to apply for an EIN through the online system. An ITIN is a tax processing number for people who need to interact with the US tax system but are not eligible for a Social Security Number. Getting an ITIN requires filing Form W-7 with the IRS along with documentation proving your foreign status and identity. This process can itself take several weeks, so the sequencing matters if you are in a hurry to get your business operational.
doola specializes in helping foreign nationals navigate exactly this situation, including obtaining EINs without an SSN and managing the ongoing tax and compliance requirements that apply to foreign-owned US LLCs.
What the EIN confirmation letter looks like and why you should save it
When you complete the online EIN application, you receive what is called a CP 575 notice. This is the official IRS letter confirming your EIN assignment. It shows your LLC’s legal name, your EIN, and the date it was issued.
This document matters because it is the official proof of your EIN from the IRS. Banks typically want to see it when you open a business account, not just the EIN number itself. Some banks accept a screenshot of the online confirmation page, but many prefer the actual CP 575.
If you lose the CP 575, you can call the IRS Business and Specialty Tax Line at 800-829-4933 and request a replacement, but this can take time and the process involves waiting on hold and going through identity verification. Saving the original document in a secure location when you first receive it is much easier.
One thing to be aware of: the IRS will not email you the CP 575. The online system lets you download and print it immediately during the application session, but if you close the window without downloading it you will need to contact the IRS to get a replacement or a 147C letter, which is a different confirmation letter that serves the same purpose. Download and save it the moment it appears on screen.
Common mistakes people make when applying for an EIN
A few errors come up repeatedly when LLC owners apply for EINs, and most of them create headaches that take time to fix.
The most common mistake is entering the LLC name incorrectly. The name on the EIN application needs to match exactly what is on your state formation documents. If your LLC is registered as “Blue River Consulting LLC” but you enter “Blue River Consulting” without the LLC designation, or “Blue River Consulting, LLC” with a comma, and your state filing uses neither of those formats, you now have a discrepancy between your state records and your federal tax records. Banks may flag this when you go to open an account. Fixing it requires contacting the IRS. Use the exact legal name from your articles of organization, character for character.
The second common mistake is applying before the LLC is officially approved. Some states take several weeks to process LLC formations. Applying for an EIN while your formation is still pending means the IRS is issuing a tax ID for an entity that may not yet exist in the legal sense. Wait for the state approval confirmation before you apply.
The third mistake is listing the wrong responsible party. For a single-member LLC, the responsible party should be you, the individual owner, using your Social Security Number. Some people try to list the LLC itself as the responsible party, which does not work because the LLC does not have a SSN. The responsible party on an EIN application must be an individual with their own SSN or ITIN.
The fourth mistake, which is specific to multi-member LLCs, is having multiple members each apply for a separate EIN thinking they each need one for their share of the LLC. An LLC has one EIN. It belongs to the entity. Individual members do not get separate EINs for their membership interest. One member applies on behalf of the LLC and that EIN is what the LLC uses for everything.
The fifth mistake is applying for multiple EINs thinking you need a different one for different purposes. You do not. Your LLC has one EIN and uses it for everything: bank accounts, tax filings, credit applications, W-9s, payroll. If you accidentally end up with two EINs, one of them needs to be cancelled by calling the IRS.
Using your EIN for different purposes
Once you have your EIN, here is how it shows up in different contexts.
When a client or vendor asks you to fill out a W-9, the W-9 asks for your tax identification number. For your LLC, that is your EIN. Enter it in the TIN field and check the box indicating that you are an LLC, then note the tax classification. If you are a single-member LLC taxed as a sole proprietor, you check the single-member LLC box and write “D” in the classification field for disregarded entity. If you have elected S-Corp status, you write “S” in that field.
When you open a business bank account, the bank will ask for your EIN as part of the account application. They will also typically want to see your CP 575 confirmation letter and a copy of your articles of organization or certificate of formation from the state. Having these documents organized before you go to the bank or complete an online application saves time.
When you file your annual taxes, your EIN appears on whichever return applies to your LLC structure. For a single-member LLC it goes on Schedule C of your personal Form 1040. For a multi-member LLC it goes on Form 1065. For an S-Corp it goes on Form 1120-S.
When you apply for a business credit card, the application will ask for your EIN. Some cards, particularly those designed for small businesses and sole proprietors, also ask for your SSN as a personal guarantee. That is separate from the EIN and does not mean you should use your SSN in place of your EIN for the business identification fields.
When you hire employees, your EIN goes on all payroll tax filings, on the W-2s you issue to employees at year end, and on the unemployment tax filings you make to both the IRS and your state.
When you apply for a business loan, the lender will use your EIN to pull business credit history if your LLC has any, and to verify the entity in their system.
Does your EIN change if your LLC changes?
This question comes up in several different scenarios and the answer is not always the same.
If you change your LLC’s name with the state, your EIN does not change. The number stays the same because it is tied to the entity itself, not the name. You do need to notify the IRS of the name change, which you can do by sending a letter to the IRS or, for some entity types, by noting the name change on your next tax return. Your bank will also need to be updated because the name on your account needs to match the legal name.
If you change your LLC’s address, your EIN does not change. You notify the IRS of the address change using Form 8822-B, which is the change of address form for businesses.
If you add or remove members from a multi-member LLC, your EIN generally does not change as long as the entity itself continues to exist. You may need to update your operating agreement and potentially notify the IRS if the tax classification changes, but the EIN stays the same.
If you convert your LLC from single-member to multi-member or vice versa, in most cases the EIN stays the same. However, if the change also involves a change in the tax classification of the entity, for example moving from a disregarded entity to a partnership, the IRS may require a new EIN. This is one of those situations where confirming with a CPA or tax professional before making the change is worth doing.
If your LLC is dissolved, you do not need to cancel the EIN. EINs are never reused by the IRS once assigned. A dissolved LLC’s EIN simply becomes inactive.
If your LLC undergoes a significant structural change such as a merger, conversion to a corporation, or certain types of ownership transfers, a new EIN may be required. The IRS has published guidance on when a new EIN is and is not required for various types of business changes, and this is another situation where professional advice is worth getting.
EINs for LLCs with multiple states
If your LLC is registered in one state but you then register it as a foreign LLC in additional states, you do not get a new or separate EIN for each state. Your LLC has one EIN and uses it in all states where it is registered.
State tax obligations in each state where you operate may require you to register for a state tax identification number, which is separate from your federal EIN. Many states issue their own tax IDs for sales tax collection, state income tax withholding, and unemployment insurance. These are state-level identifiers that you get through each state’s revenue or taxation department, not through the IRS.
What if you need a new EIN?
The IRS does require a new EIN in certain specific circumstances. The most common ones for LLC owners are:
You form a new, separate LLC. Each LLC is a separate legal entity and gets its own EIN.
You convert your LLC to a corporation. A corporation is a different type of entity from an LLC and requires a new EIN.
You take over a sole proprietorship or partnership that was operating under someone else’s EIN. You cannot use the previous owner’s EIN for your new entity.
You purchase an existing business that was operating as an LLC but the purchase structure involved dissolving the original entity and forming a new one rather than a simple ownership transfer. The new entity needs its own EIN.
If you are unsure whether a change to your business requires a new EIN, the IRS has a specific resource called “Do You Need a New EIN?” on irs.gov that walks through different scenarios. A CPA can also answer this in minutes for your specific situation.
EINs and business credit
One thing that new LLC owners sometimes do not realize until later is that your EIN is the anchor for your business credit profile, which is separate from your personal credit profile.
Business credit bureaus like Dun and Bradstreet, Experian Business, and Equifax Business track the credit history of business entities using identifiers including the EIN. When you open a business bank account, get a business credit card, establish a net-30 account with a vendor, or take out a business loan, those activities can be reported to business credit bureaus and begin building your LLC’s credit history under its EIN.
Building business credit takes time and deliberate action, but it matters because a strong business credit profile eventually allows you to access financing based on the business’s history rather than your personal credit score, which means your personal credit is less at risk if the business borrows money.
The EIN is what makes this separation possible. Without it, your business activity gets tied to your SSN and your personal credit history, and the two never get properly separated.
Protecting your EIN
Your EIN is a business identifier, not a secret code, and it is less sensitive than your Social Security Number. You will hand it out regularly on W-9s and tax documents, and that is normal and expected.
That said, EIN-based identity theft does exist and is worth being aware of. Fraudsters can use a legitimate EIN to file fraudulent business tax returns, claim refunds, or open credit accounts in the business’s name. The risk is lower than SSN-based identity theft but it is real.
A few basic practices reduce the risk. Do not share your EIN more broadly than necessary. Hand it out on W-9s and to banks and vendors as required, but there is no reason to post it publicly, include it in email signatures, or share it casually. Monitor your LLC’s credit profile periodically to catch anything that looks unfamiliar. If you receive IRS notices about your LLC’s tax returns that you did not file, treat them as urgent and contact the IRS immediately.
Getting an EIN through a formation service
If you use a business formation service to set up your LLC, many of them offer EIN filing as part of their package or as an add-on service. They fill out and submit the SS-4 on your behalf and pass the EIN along to you once it is assigned.
This can be useful if you are using a service for the full formation process and want everything handled in one place, or if you are a foreign national who cannot use the online IRS application and wants a service to manage the fax or mail process for you.
The trade-off is cost. EIN applications are free when you do them yourself through the IRS website. Formation services that charge for EIN filing are typically charging between $50 and $100 for a task that costs you nothing to do directly. If you are comfortable spending ten minutes on the IRS website, there is no reason to pay for this.
For foreign nationals who cannot use the online application, a formation service handling the SS-4 by fax or mail does save meaningful time and effort, particularly if you are not familiar with US IRS processes. In that case the fee is more justifiable.
doola handles EIN filing for both US-based and international founders as part of its formation packages, which is particularly useful for foreign LLC owners navigating the fax application process.
After you get your EIN: the immediate next steps
Your EIN in hand is the green light to take the next two steps that complete your LLC’s operational setup.
The first is opening a business bank account. Take your EIN confirmation letter, your articles of organization or certificate of formation from the state, and a government-issued ID to the bank or complete the online application with those documents ready to upload. Some banks also ask for your operating agreement. Having all of this organized before you start the account application makes the process straightforward.
The second is using the EIN on your first business documents. If you have a website, any business registration with local authorities, any professional memberships, or any vendor or supplier relationships being set up, use the EIN rather than any personal identifiers from this point forward. You are now operating as an LLC, and your paperwork should reflect that consistently.
If you are hiring contractors, set up your process for collecting W-9s from them and issuing 1099-NEC forms at the end of the year. If you expect to owe estimated taxes, set up your estimated payment schedule now rather than discovering it in April that you owe a large sum with an underpayment penalty attached.
Bottom line
An EIN is your LLC’s federal tax identification number. It is free to get, takes about ten minutes to apply for online through the IRS website, and you only do it once. You need it to open a business bank account, file taxes, hire employees, complete W-9 forms for clients, and apply for business credit.
Apply immediately after your LLC is approved by the state. Download and save your CP 575 confirmation letter the moment it appears on screen. Enter your LLC’s legal name exactly as it appears on your state formation documents to avoid discrepancies in your records.
If you are a foreign national without a US Social Security Number or ITIN, the online application is not available to you and you will need to apply by fax using Form SS-4, or use a formation service that handles the application for you.
Everything else in your LLC’s operational life builds on these first few steps: formation, EIN, bank account, bookkeeping. Getting the EIN right and getting it done immediately after formation means you are starting from a clean foundation rather than trying to untangle mixed finances and incomplete records later.
This article is for informational purposes only and does not constitute legal or tax advice. Consult a licensed CPA or attorney for guidance specific to your situation.
Sponsored by doola. doola helps US and international founders start, run, and stay compliant with their US business. From LLC formation to EIN filing, registered agent service, and ongoing compliance, doola handles the paperwork so you can focus on building.
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