Massachusetts EIN and Your MassTaxConnect Account ID

Last updated November 1, 2026 · Written by the EIN Registration filing team

There is no Massachusetts EIN. The IRS issues it on Form SS-4. What Massachusetts adds comes after it: an Account ID from the Massachusetts Department of Revenue once you pay wages, an unemployment insurance account with the Massachusetts Department of Unemployment Assistance, and a Sales and Use Tax Registration Certificate from the Massachusetts Department of Revenue if you sell taxable goods or services.

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We file the SS-4 for you. EIN typically emailed in 2 to 4 business days (about 11 by fax).

LLC →Corporation →Sole Proprietor →Partnership →Trust →Estate →

After your EIN in Massachusetts

Account	Agency	Number you get	Register
State income tax withholding	Massachusetts Department of Revenue	Account ID	MassTaxConnect
Unemployment insurance	Massachusetts Department of Unemployment Assistance	Account number issued at registration	Unemployment Services for Employers
Sales tax	Massachusetts Department of Revenue	Sales and Use Tax Registration Certificate	MassTaxConnect

MassTaxConnect gives your business an Account ID, a randomly generated number that DOR uses in place of your Federal Identification Number or Social Security number when you conduct business with it. DOR says this speeds processing and helps prevent identity fraud.

Massachusetts Paid Family and Medical Leave contributions are collected by the Department of Revenue, and all PFML account registrations and payments go through MassTaxConnect, the same system used for withholding. Businesses with at least one Massachusetts employee must register.

Also on the Massachusetts list

Register with the Massachusetts Department of Revenue on MassTaxConnect, through Register a New Taxpayer, for the taxes the business owes, such as sales and use tax, meals tax or withholding. DOR requires businesses to register with an EIN, and for taxes like sales and use it mails a registration certificate for each location, which must be posted and visible at all times.
File the annual report with the Corporations Division every year on or before the anniversary of the date the certificate of organization was filed. The report repeats the information in the certificate and asks for the LLC's federal identification number.

Agency sites checked November 1, 2026 · All 50 states

What is different about Massachusetts

The first item on a Massachusetts certificate of organization is the LLC's federal employer identification number, if it has one, and certificates of amendment and cancellation ask for it outright. The Corporations Division assigns its own identification number as well, so a Massachusetts LLC's public record can carry two different numbers side by side, and only the federal one is the EIN.
Massachusetts has no single statewide annual report deadline for LLCs. Each LLC's report is due on or before the anniversary of its own certificate of organization, and an LLC that was administratively dissolved must file every annual report it owes before it can be reinstated.
A Massachusetts certificate of organization can name the people authorized to sign and record documents affecting the LLC's interest in real property, whether recorded at a registry of deeds or a district office of the Land Court. Those names appear on the Corporations Division's public record for the LLC and are carried forward on each annual report.

Before you apply

The SS-4 must match the Massachusetts Secretary of the Commonwealth, Corporations Division filing; its identification number is a state index, not a tax ID.

Massachusetts EIN questions

How do I get an EIN number in Massachusetts?

File IRS Form SS-4 after the Massachusetts Secretary of the Commonwealth, Corporations Division approves any formation filing; there is no Massachusetts EIN application. Then register with the Massachusetts Department of Revenue (MassTaxConnect) for withholding and the Sales and Use Tax Registration Certificate and the Massachusetts Department of Unemployment Assistance (Unemployment Services for Employers) for unemployment insurance.

Is the Massachusetts Account ID the same as my EIN?

No. The Massachusetts Department of Revenue assigns it when you register as an employer in MassTaxConnect. It goes in W-2 box 15; the EIN goes in box b.

Where do I register for Massachusetts unemployment insurance?

With the Massachusetts Department of Unemployment Assistance, online through Unemployment Services for Employers. The account is separate from the federal EIN, which the registration asks for.

Do I need a Massachusetts Sales and Use Tax Registration Certificate?

Only if you sell what Massachusetts taxes. The Massachusetts Department of Revenue issues it through MassTaxConnect, and your returns are filed under its number, not the EIN.

Is there a Massachusetts EIN?

No. The EIN is federal and comes from the IRS, and Massachusetts uses that same number. The Department of Revenue requires businesses to register on MassTaxConnect with an EIN, and the Corporations Division's certificate of organization and annual report ask for the LLC's federal identification number. Any number the Corporations Division assigns on its own is a state record number, not a tax ID.

Do I need the EIN before filing the certificate of organization?

No. The certificate asks for the federal employer identification number only if the LLC already has one, so you can form the LLC first and apply for the EIN once the Corporations Division accepts the filing. The annual report asks for the federal identification number every year, so have the EIN before the first report comes due.

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Sources

You can also apply for an EIN directly with the IRS at irs.gov at no cost.