How to Get a Tax ID Number in Maine for a New Business

For a new Maine business, “tax ID number” may mean one of two things: a federal Employer Identification Number (EIN) or a Maine tax registration/account number. They are issued separately and serve different purposes. Most businesses should first determine their legal structure and tax activities, obtain an EIN when required, and then register for the Maine tax accounts that apply to the business.

The Internal Revenue Service issues the nine-digit EIN used for federal tax filing and reporting. Maine Revenue Services (MRS), by contrast, handles state tax-account registration. A business may need both identifiers, but obtaining an EIN does not automatically register the business for Maine sales tax, withholding, or another state-administered tax.

Understand Which Tax ID Your Maine Business Needs

Start by identifying what the person, bank, vendor, or agency requesting a “tax ID” actually needs. The phrase is often used broadly, so relying on the label alone can lead to the wrong application.

Federal EIN

An EIN is the business identifier issued by the IRS. The IRS states that an EIN is generally needed to hire employees, operate a partnership or corporation, pay sales or excise taxes, or administer certain trusts, retirement plans, and estates. Even when a business is preparing for state tax registration, the EIN remains a federal identifier rather than a Maine-issued account number.

Maine tax account number

A Maine tax account connects a business to a specific state tax responsibility. Whether one is needed depends on what the business does, such as making taxable sales or employing workers. Registration for one account should not be treated as registration for every possible Maine business tax.

For sales tax, a business located in Maine that regularly sells tangible personal property or taxable services must register for a sales-tax account. A remote seller must register if its qualifying Maine sales exceed $100,000 in the previous or current calendar year. Business owners focusing on retail transactions can review the practical distinctions in Maine Sales Tax ID: Registration and Reporting Basics.

Prepare the Key Information in the Right Order

The most important sequencing issue is to establish the business entity before requesting its EIN. An LLC, partnership, corporation, or tax-exempt organization should be formed through the state before applying for an EIN; otherwise, the EIN application may be delayed.

This order helps keep the legal name and entity type consistent across records. Before starting an application, gather and verify the following information:

• The business’s exact legal name, including punctuation and entity ending, if any.
• Any trade name or DBA the business plans to use.
• The business’s legal structure, such as sole proprietorship, partnership, LLC, or corporation.
• The physical and mailing addresses that should appear in the records.
• The responsible party’s identifying information.
• A clear description of the business’s principal activity.
• Whether the business will have employees or make taxable sales.
• The date the business began or expects to begin the relevant activity.

Review names and addresses before submitting anything. Using a trade name where an application requests the legal name—or entering an entity name that does not match its formation record—can create avoidable confusion when the EIN is later used for a Maine tax registration.

For Maine sales-tax registration specifically, MRS states that any entity other than a sole proprietor needs a federal EIN to register for a Maine sales-tax number. That makes the federal application a practical prerequisite for a qualifying LLC, partnership, corporation, or other non-sole-proprietor entity seeking that state account.

Apply for the Federal EIN

Once the entity has been formed and the application information is ready, choose an available EIN application method.

1. Confirm that the business needs an EIN. Consider the entity type, employees, federal tax responsibilities, and any state registration that calls for the federal number.
2. Identify the responsible party. Use the information for the person who qualifies as the responsible party rather than substituting the preparer’s details.
3. Choose the application method. The IRS online EIN tool may be used when the principal place of business is in the United States or a U.S. territory and the applicant has the responsible party’s SSN or ITIN.
4. Complete the application carefully. Check the legal name, entity classification, addresses, responsible-party details, and business activity before submission.
5. Save the EIN confirmation. Retain the confirmation with the company’s permanent organizational and tax records so the number can be entered consistently on later registrations.

The IRS online tool is free and issues the EIN immediately online if the application is approved. Because the online application must be completed in one session and expires after 15 minutes of inactivity, prepare the details before opening it.

Applicants unable to use the online tool may apply by fax or mail using Form SS-4. Telephone applications are available only to international applicants. Regardless of the application method, EIN issuance is limited to one EIN per responsible party per day. Owners organizing several entities should account for that limit rather than attempting multiple same-day applications for the same responsible party.

Register the Appropriate Maine Tax Accounts

After obtaining the EIN when one is required, evaluate the business’s Maine activities. Do not apply for a state account merely because the company has an EIN; determine which tax responsibility is connected to its actual operations.

Businesses may register Maine tax accounts electronically through the Maine Tax Portal by selecting “Register a New Business – Start Here.” MRS also provides a paper Application for Tax Registration for sales/use tax and income-tax withholding registration.

A practical state-registration process is:

1. Classify the business’s activities. Identify what it sells, where sales occur, and whether it employs workers.
2. Determine the relevant account. For example, examine sales-tax registration if the business regularly sells tangible personal property or taxable services in Maine.
3. Gather matching records. Use the same legal name, entity type, address, and EIN shown in the business’s formation and federal records.
4. Select an available registration method. Complete the applicable registration electronically or use the paper application offered by MRS.
5. Keep the resulting account information organized. Store the state registration separately from the EIN confirmation, and label each record by its purpose.

Online sellers should distinguish between having a Maine location and selling into Maine from elsewhere. The applicable sales-tax standard is not identical for those situations. For a closer look at remote transactions, see How to Register for a Sales Tax ID in Maine for Online Sales. Businesses buying inventory for resale may also need to understand the documentation used in those purchases; How to Get a Resale Certificate in Maine explains that separate topic.

Avoid Common Application Mistakes and Plan the Next Steps

A successful application process is largely about using the correct identifier, following the proper sequence, and keeping information consistent. Watch for these common mistakes:

• Treating every tax ID as the same number. An EIN and a Maine tax account number are separate identifiers. Confirm which one is being requested before providing it.
• Applying for the EIN before forming the entity. If the business will be an LLC, partnership, corporation, or tax-exempt organization, complete state formation first.
• Confusing a DBA with the legal entity. Enter each name in the field intended for it rather than replacing the legal name with the trade name.
• Starting the online EIN application unprepared. Gather the responsible-party and business details in advance because the application is completed in one session and is subject to an inactivity limit.
• Submitting inconsistent information. Compare the formation record, EIN application, and Maine registration before filing.
• Assuming an EIN completes state registration. Review the business’s sales and employment activities separately to identify applicable Maine accounts.
• Discarding confirmation records. Preserve both federal and state documents, clearly noting which number belongs to which registration.

After receiving the appropriate numbers, use them only for their intended purposes and maintain a central record showing the business’s legal name, EIN, Maine account numbers, trade names, and associated correspondence. If the business changes its structure or begins a new activity—such as hiring workers or making taxable sales—review whether its existing registrations still match its operations rather than assuming the original setup covers the change.

The central takeaway is simple: form the entity when applicable, obtain the federal EIN when required, and then register each Maine tax account connected to the business’s activities. Keeping those stages separate makes it easier to submit consistent information and respond accurately whenever a tax ID is requested.