If your business makes taxable sales to customers in Connecticut, you may need to register for a Connecticut Sales and Use Tax Permit before collecting sales tax. This 2026 guide explains who must register, what information you need, and how to complete the registration process through myconneCT.
For broader information about Connecticut sales tax rules, rates, and taxability, see the Connecticut Sales Tax Guide. For details on filing deadlines and how to submit returns, see the Connecticut Sales Tax Filing Guide.
Quick answers: Connecticut sales tax registration
A quick overview of the authority, registration portal, nexus threshold, and other essentials for registering in Connecticut.
| Fact | Detail |
|---|---|
| Authority | Connecticut Department of Revenue Services |
| Registration portal | myconneCT |
| Economic nexus threshold | $100,000 in annual sales or 200 separate transactions into Connecticut |
| Registration fee | Free |
| Renewal period | No periodic renewal required |
Who must register for Connecticut sales tax
You must register for a Connecticut Sales and Use Tax Permit if your business has a sales tax nexus in the state. This usually applies when a business:
- Exceeds the economic nexus threshold of $100,000 in annual sales or 200 or more separate transactions into Connecticut in the current or previous calendar year, or;
- Has a physical presence in Connecticut, such as an office, employee, warehouse, or inventory stored in the state.
Connecticut's dual threshold means you must register once you cross either the dollar amount or the transaction count, whichever comes first.
Connecticut requires registration before making any taxable sales in the state. Once you exceed the threshold, you should register before collecting sales tax from Connecticut customers. If you're unsure whether your business has nexus, see the Connecticut Sales Tax Guide for a broader explanation.
How to register for Connecticut sales tax
Sellers can register online through myconneCT, the Connecticut Department of Revenue Services online portal. This is the same portal you will use to file returns and make payments after registration.
Information you need before registering
Before applying for a Connecticut Sales and Use Tax Permit, have this information ready:
- Your Social Security number (if registering as a sole proprietor with no employees)
- Your Employer Identification Number (EIN), if your business has one (required for corporations, partnerships, and most LLCs)
- North American Industry Classification System (NAICS) code for your primary business activity
- The date of your first sale in Connecticut
- Your business address and any Connecticut locations, if applicable
Registration steps
Follow these steps to register for a Connecticut Sales and Use Tax Permit.
1. Create your myconneCT account
Set up your myconneCT account credentials.
- Choose a username and password
- Set up your security information
- This login is used for all future filings, payments, and account management
If you already have a myconneCT account for other Connecticut tax types, you can add a sales and use tax account to your existing login.
2. Provide your business information
Enter your business name, address, type of entity, and a description of your business activities.
- Remote sellers without a Connecticut location should indicate they are selling remotely into the state
- Connecticut uses destination-based sourcing for remote sellers. You charge based on where the buyer is located
- Because Connecticut has no local sales taxes, a single statewide rate of 6.35% applies to all taxable sales regardless of the buyer's location within the state
3. Registration fee
There is no fee to register for a Connecticut Sales and Use Tax Permit. Registration through myconneCT is free.
4. Submit your application
Review your entries and submit the application.
- You will receive an on-screen confirmation after submission
- A confirmation email is typically sent shortly after submission
5. Receive your Connecticut Sales and Use Tax Permit
Once approved, you will receive:
- Your Connecticut Sales and Use Tax Permit number (used for filing and payments)
- Your assigned filing frequency (monthly, quarterly, or annually, based on expected tax liability)
- Access to myconneCT for filing, payment, and account management
What happens after registration
After registering, you must begin collecting Connecticut sales tax on taxable sales and file returns based on your assigned filing frequency. Returns are due on the last day of the month following the reporting period.
Connecticut taxes digital goods and SaaS, so businesses selling software subscriptions or downloadable content to Connecticut customers must collect and remit sales tax on those sales. See the Connecticut Sales Tax Guide for details on taxability.
Because Connecticut has no local sales taxes, you apply the same 6.35% rate to all taxable sales statewide, no county or city rate lookups required.
➡ Learn more about Connecticut sales tax rates, taxability, and nexus in the Connecticut Sales Tax Guide
➡ See how to file and pay Connecticut sales tax in the Connecticut Sales Tax Filing Guide
Note: At Quaderno we love providing helpful information and best practices about taxes, but we are not certified tax advisors. For further help, or if you are ever in doubt, please consult a professional tax advisor or the local tax authorities.
Need help registering across multiple states?
Watch our webinar: US Sales Tax Registration & Filing Tips + AMA. Learn how international sellers register, file, and manage US sales tax compliance across multiple jurisdictions.
Note: At Quaderno we love providing helpful information and best practices about taxes, but we are not certified tax advisors. For further help, or if you are ever in doubt, please consult a professional tax advisor or the tax authorities.
