Connecticut EIN: Tax Registration Number and ReEmployCT
Last updated November 1, 2026 · Written by the EIN Registration filing team
Get the EIN for your Connecticut business
We file the SS-4 for you. EIN typically emailed in 2 to 4 business days (about 11 by fax).
After your EIN in Connecticut
| Account | Agency | Number you get | Register |
|---|---|---|---|
| State income tax withholding | Connecticut Department of Revenue Services | Connecticut Tax Registration Number, 7 or 8 digits plus a 3-digit location code | myconneCT |
| Unemployment insurance | Connecticut Department of Labor | Employer Account Number (EAN), 10 digits, written XX-XXXXX-X-XX | ReEmployCT |
| Sales tax | Connecticut Department of Revenue Services | Sales and use tax permit | myconneCT |
Connecticut gives employers two different numbers. The Department of Revenue Services issues a Connecticut Tax Registration Number for income tax withholding, and the Department of Labor issues its own number for unemployment. DRS tells employers not to put the Labor number on DRS forms.
Connecticut issues a Sales and Use Tax Permit for each business location. A business that will sell from more than one location must register for a separate permit for each one through myconneCT.
Also on the Connecticut list
- Register with the Connecticut Department of Revenue Services through myconneCT before your first taxable sale or first payroll. The registration asks for the EIN, and each tax type the business needs, such as sales and use tax or withholding, is registered there.
- File the LLC annual report with the Secretary of the State between January 1 and March 31 every year, starting the calendar year after formation. It is filed on business.ct.gov under the business ID, not the EIN.
Agency sites checked November 1, 2026 · All 50 states
What is different about Connecticut
- Connecticut's annual report window is fixed for every LLC regardless of formation date: January 1 to March 31. Most states tie the due date to the formation anniversary, so an LLC formed in Connecticut in December owes its first report within about three months of existing.
- Connecticut's pass-through entity tax was mandatory for LLCs taxed as partnerships or S corporations from 2018 through 2023 and became elective for tax years beginning in 2024. Whether to elect it is now a yearly decision that depends on the members' own returns, and it is made with the entity return rather than on the SS-4.
- business.ct.gov puts the Secretary of the State filing, the Department of Revenue Services registration and the Department of Labor employer registration behind one login, which is why Connecticut owners usually finish state setup in a single session once the EIN exists.
Before you apply
The SS-4 must match the Connecticut Secretary of the State filing; its business ID is a state index, not a tax ID.
Connecticut EIN questions
How do I get an EIN number in Connecticut?
File IRS Form SS-4 after the Connecticut Secretary of the State approves any formation filing; there is no Connecticut EIN application. Then register with the Connecticut Department of Revenue Services (myconneCT) for withholding and the sales and use tax permit and the Connecticut Department of Labor (ReEmployCT) for unemployment insurance.
Is there a Connecticut EIN or state tax ID number?
No; only the IRS issues EINs (also called the FEIN or federal tax ID). Connecticut's own numbers are the business ID from the Connecticut Secretary of the State, the Connecticut Tax Registration Number from the Connecticut Department of Revenue Services, the Employer Account Number (EAN) from the Connecticut Department of Labor, and the sales and use tax permit from the Connecticut Department of Revenue Services.
Is the Connecticut Tax Registration Number the same as my EIN?
No. The Connecticut Department of Revenue Services assigns it when you register as an employer in myconneCT, and it is 7 or 8 digits plus a 3-digit location code. It goes in W-2 box 15; the EIN goes in box b.
Where do I register for Connecticut unemployment insurance?
With the Connecticut Department of Labor, online through ReEmployCT. It assigns an Employer Account Number (EAN), 10 digits, written XX-XXXXX-X-XX, a separate number from the EIN.
Do I need a Connecticut sales and use tax permit?
Only if you sell what Connecticut taxes. The Connecticut Department of Revenue Services issues it through myconneCT, and your returns are filed under its number, not the EIN.
Get Your EIN the Easy Way
Answer a few questions in about 5 minutes. Our specialists prepare your IRS Form SS-4, file it, personally handle any rejection or name conflict along the way, and get your EIN to you, typically within 2 to 4 business days, or about 11 when the IRS requires the application by fax. One flat $197 service fee. No upsells, no subscriptions.
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Related guides
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Sources
- Connecticut business portal (business.ct.gov)
- Connecticut Department of Revenue Services, registering a business
- Connecticut Department of Revenue Services: Registering with drs
- Connecticut Department of Revenue Services: Tax information
- Connecticut Department of Revenue Services: Portal.ct.gov
- Connecticut Department of Labor: How do I register
- Connecticut Department of Labor: Welcome screen login credentials employer account numbers
- Connecticut Department of Revenue Services: Tax information
You can also apply for an EIN directly with the IRS at irs.gov at no cost.