How To Apply For An EIN In Massachusetts (Sep. 2026)

You’re officially recognized as a separate legal entity in the state once your Massachusetts Limited Liability Company (LLC) has an approved Certificate of Organization. This is really important. Following this, you need to apply for an Employer Identification Number (EIN) from the Internal Revenue Service (IRS).

Practically speaking, an EIN is needed for efficient long-term business operations. Don’t forget this. You typically need one for most of your operational tasks. This includes:

• Filing required federal tax returns and paying taxes.
• Opening a dedicated business bank account.
• Applying for applicable licenses and permits.
• Registering for necessary Massachusetts tax accounts.
• Hiring LLC employees and running payroll.

In this article, I will discuss how to apply for an EIN in Massachusetts. You’ll learn how to file based on your residency status and the dangers of running your business without one.

An Overview Of The Massachusetts EIN

The Massachusetts EIN is a unique nine-digit federal ID number issued by the IRS and used for federal tax reporting purposes in the state of Massachusetts.

Your LLC generally needs an EIN for federal tax purposes if it falls into any of the categories below. I’ve explained more about this in the following sections.

• LLCs with employees.
• Foreign-owned LLCs.
• Multi-member LLCs.
• LLCs electing to be taxed as corporations.

You can apply for your Massachusetts EIN using two main application methods:

1. Online using the official IRS application system.
2. Submit by mail/fax after completing Form SS-4.

All filing methods are completely FREE. However, your processing times differ. Your best application method depends on whether you have a valid U.S. Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN).

I’ve discussed your different filing options in the sections below.

1. When To Apply For Your Massachusetts EIN?

I recommend applying as soon as possible once your Massachusetts Certificate of Organization has been approved. Under IRS rules, your LLC must legally exist before being issued a federal tax ID number.

Alongside this, ensure that your LLC ownership structure is already finalized. You may need to provide updated information, or your tax classification may change if:

• You add or remove LLC members.
• You switch from a single-member LLC to a multi-member LLC (or vice versa).

2. Different EIN Synonyms

Before I get into more detail, your EIN may be called several different names. Each one refers to the same nine-digit federal identification number. I’ve listed the most common names in the table below to help you avoid confusion when completing your required filings.

How To Apply For An EIN In Massachusetts

If you’re wondering how to get an EIN for your Massachusetts LLC, the filing process follows the same IRS rules regardless of your business location. Your application methods are the same across all U.S. states. Under IRS guidelines, you have three main submission methods:

• Online application: The process usually takes 15 minutes.
• Fax submission: Processed in about 4 business days.
• Mail submission: Processed in approximately 4 weeks + mailing time.

Your most suitable method depends on your U.S. residency status. More specifically, it depends on whether you have an SSN or an ITIN.

I’ve divided the next section into two groups according to your U.S. residency.

1. Getting Your EIN As A U.S. Citizen

You can use any of the available IRS application methods if you’re a U.S. citizen with a valid SSN or ITIN. However, the online application method is the fastest and easiest way to obtain your EIN.

If you need a detailed breakdown, read my guide on How To File For An EIN Online.

With other options taking a lot longer, you should only really use them if you experience an error when using the online system or a technical issue with the official portal. I’ve provided detailed guidance on how to do this below.

2. Getting Your EIN As A Non-U.S. Citizen

If you’re a non-U.S. citizen, you can still obtain an EIN for your Massachusetts LLC. However, without a valid SSN or ITIN, you can NOT use the online filing system.

Instead, you need to complete Form SS-4 offline, then submit it to the IRS by fax or mail.

Use the contact details below when submitting your application:

• Mailing address: IRS (Attn: EIN Operation), Cincinnati, OH 45999.
• Fax number (non-resident/foreign applicants): 855-215-1627 (within the U.S.) or 304-707-9471 (from outside the U.S.)

Read my guide on How To Complete Form SS-4 For Foreign EIN Applicants for a full walkthrough.

The EIN Confirmation Letter Procedure

Once approved, the IRS will provide your LLC with an EIN Confirmation Letter (CP 575).

Your EIN is typically issued immediately if you apply online. Once you’ve submitted and had your application approved, you’ll be able to download and save Form CP-575 straight away.

If you apply by completing Form SS-4 and sending it by mail, Form CP-575 will be issued to the mailing address given on your application once it’s been processed.

Make sure you keep Form CP-575 securely stored with your business records. This is because state agencies, banks, and tax authorities often require it for filings, account setup procedures, and ongoing compliance requirements.

1. How Do I Find My EIN Number Online?

You will NOT be given a replacement EIN Confirmation Letter from the IRS if you lose Form CP-575 or don’t download it once it’s issued.

Because of this, you must contact the IRS to request an EIN Verification Letter (Form 147C). This confirms that your LLC has a valid EIN and holds the same legal standing as Form CP-575. It will be accepted by all banks, financial institutions, and government agencies.

Call the IRS at 800-829-4933 to request Form 147C. They’re open Monday to Friday, 7:00 a.m. to 7:00 p.m. ET. The IRS may provide your EIN over the phone once you’ve confirmed your identity and LLC authority.

Who Needs To Obtain A Massachusetts EIN

Your Massachusetts EIN requirements depend on your LLC’s federal tax classification.

The IRS classifies LLCs into two main categories by default. These are based on the number of LLC members:

• Multi-member LLCs: Taxed as a partnership.
• Single-member LLCs: Taxed as a disregarded entity.

You can also elect to be taxed as a corporation (S corporation or C corporation) if you file the correct IRS forms.

I’ve discussed the different EIN requirements for each group in the sections below.

1. Single-Member LLC EIN Requirements

You don’t automatically require an EIN if your LLC chooses to keep its default tax classification as a disregarded entity. With no clear separation between yourself and your LLC, you may be able to use your own SSN.

However, this creates several operational risks once your LLC is officially formed and running. I highly recommend getting an EIN to ensure smoother long-term operations. Once your LLC hires employees or is subject to certain excise taxes, obtaining an EIN is a mandatory requirement.

2. Multi-Member LLC EIN Requirements

With more than one owner, you’re NOT able to use an individual’s SSN. Multi-member LLCs must obtain an EIN and use it as their tax identifier. This allows the IRS to track your required tax obligations and process filings.

This approach is stated under 26 C.F.R. § 301.6109-1(a)(1)(ii-C).

3. Do LLCs Taxed As A Corporation Need An EIN?

As I’ve stated above, your LLC can elect to be taxed as a corporation (S corporation or C corporation) by filing the correct IRS forms. This is instead of keeping your default tax classification. If you choose this, the IRS will tax your income differently.

Under 26 C.F.R. § 301.6109-1(a)(1)(ii)(C), your LLC must use an EIN as its taxpayer identification number once it chooses corporate tax treatment. Practically speaking, you must obtain an EIN before submitting your corporate tax election forms.

The Importance Of Obtaining An EIN For Your Massachusetts LLC

Your LLC will NOT be fined or face penalties for failing to obtain an EIN. However, you won’t be able to complete your required state filings or federal filings without one. This eventually leads to unwanted consequences.

You must obtain your Massachusetts EIN for three main reasons. I’ve discussed each of these in more detail below.

1. State Requirements

Most Massachusetts LLCs conducting business in the state must register with the Massachusetts Department of Revenue (DOR) for at least one tax account using the MassTaxConnect system. Examples include the Sales and Use Tax and the Withholding Tax.

However, you need to provide an EIN to complete your registration process.

If you don’t register, you’re NOT exempt from filing your required Massachusetts tax returns, even if NO tax is due. Practically speaking, it increases your risk of:

• Back taxes for amounts that must be paid.
• Penalties.
• Late-payment interest.
• Enforcement actions and potential criminal exposure (in serious cases).

Example: Most Massachusetts LLCs need to register for a Sales and Use Tax Registration Certificate. Attempting to operate without one increases the risk of:

• Penalties and interest: Applies to non-filing and non-payment.
• Criminal exposure: The DOR might consider your failure to register as willful noncompliance. In this case, they may charge a felony punishable by up to $10,000, 5 years in prison, or both under M.G.L. c. 62C § 73.

You can learn more by reading my detailed article: How To Obtain A Massachusetts Sales Tax Certificate For Your Massachusetts LLC.

2. Federal Legal And Tax Compliance Risks

Your LLC faces serious federal compliance issues if you try to operate without a valid EIN.

a. Failure To Furnish A Required Taxpayer Identification Number

Your LLC may be seen as noncompliant if you’re required to file your federal tax returns but can’t provide a valid EIN.

Example: Your LLC needs to file Form 1099 to report payments made to independent contractors. If you don’t have an EIN, you trigger two penalties under the Internal Revenue Code.

• Penalties for incorrect or incomplete information returns (IRC § 6721).
• Penalties for failing to furnish accurate payee statements (IRC § 6722).

The above penalties apply per return, NOT per filing period. As of 2026, the IRS adjusted penalty amounts are as follows:

• Up to $340 per return (standard penalty).
• Up to $680 per return/10% of the required amount, if your violation is seen as intentional.

b. Failure To File Returns And Pay Federal Taxes

Your Massachusetts LLC may not be able to complete key federal tax functions without a valid EIN. This includes:

• Filing federal income tax returns.
• Issuing or receiving reportable payments.

Under IRC § 6651, you may face penalties if you fail to file your required returns or pay your federal taxes.

c. Penalties For Payroll And Withholding Noncompliance

You need an EIN to run payroll if your Massachusetts LLC hires employees. As your payroll withholdings are treated as trust-fund taxes, the IRS expects your LLC to withhold and remit them correctly, meaning you must get an EIN.

Under IRC § 6672, non-compliance triggers penalties for responsible individuals. This includes significant penalties and potential criminal exposure in serious cases.

3. Operational Limitations

Practically speaking, you need an EIN so that your LLC can function correctly within the U.S. financial and tax system. Lenders, banks, and state tax agencies will use it as the primary ID number for credit, business accounts, and reporting.

Without one, your LLC may need to rely on personal substitutes. Examples include running transactions through your personal bank account or using your own credit profile for financing. When this happens, you blur the separation between yourself and your LLC and increase your compliance and audit exposure. This puts your personal assets at risk and weakens the liability protections commonly provided by your LLC business structure.

Contacting The IRS

If you have any questions or issues regarding your EIN application process, you can contact the IRS directly at 1-800-829-4933. I’ve listed their key contact details below:

• Business hours: 7 A.M. – 7 P.M. (Monday – Friday).
• They’ll offer help regarding your EIN application, but won’t be able to offer tax or legal advice.

Follow the steps below to speak to a live person:

1. Press “1” for English.
2. Press “1” again for EINs.
3. Press “3” if you have an EIN, but can’t remember it (this is the only live-person option).

Frequently Asked Questions