Connecticut sales tax calculator
Get instant, accurate Connecticut sales tax calculations for any transaction amount. Whether you're creating invoices, checking expenses, or planning pricing – calculate the exact 6.35% tax with confidence, no downloads or sign-ups required.
- Calculate Connecticut's sales tax instantly on any amount
- Add the correct tax to invoices and quotes in seconds
- Verify tax amounts before filing to avoid costly mistakes
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Connecticut sales tax rates
Connecticut maintains a uniform 6.35% sales tax rate statewide with no additional local taxes, making calculations straightforward for businesses operating anywhere in the state.
- State Sales Tax Rate: 6.35%
- Average Local Tax Rate: 0.00%
- Maximum Local Tax Rate: 0.00%
- Average Combined Rate: 6.35%
How to register for sales tax in Connecticut
Register your business online via the myconneCT portal. myconneCT Registration Portal.
Determine registration requirements
You must register if you sell goods, taxable services, operate lodging, or work as a contractor.
Apply online and pay fee
Complete the application through the myconneCT portal and pay the $100 registration fee.
Display your permit
Once received, you must visibly post your permit at your business premises.
Connecticut sales tax filing due dates
Stay compliant with these filing deadlines. All returns must be filed electronically through myconneCT, and your frequency is assigned based on sales volume.
- Monthly Filers: Due by the last day of the following month (e.g., January sales due Feb 28/29).
- Quarterly Filers: Due by the last day of the month after the quarter ends (April 30, July 31, Oct 31, Jan 31).
- Annual Filers: Due by January 31 of the following year.
Important note:
If the due date falls on a weekend or holiday, the return is due the next business day. You must file even if no tax is due.
Simplify Connecticut sales tax with Xero
Xero helps you through your entire Connecticut sales tax process. It automatically applies correct tax rates to every invoice and generates compliant reports for filing. Eliminate spreadsheet errors, ensure accuracy, and spend more time focusing on growing your business instead of on taxes.
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FAQs about Connecticut sales tax
Common exemptions include most groceries, prescription medications, and certain medical equipment. Check with the Department of Revenue Services for a complete list of exempt items.
Common exemptions include most groceries, prescription medications, and certain medical equipment. Check with the Department of Revenue Services for a complete list of exempt items.
Yes, if you have nexus in Connecticut through physical presence, economic activity exceeding $100,000 in sales, or 200+ transactions annually.
Yes, if you have nexus in Connecticut through physical presence, economic activity exceeding $100,000 in sales, or 200+ transactions annually.
Unregistered businesses face a $250 fine for the first day plus $100 for each additional day operating without a permit.
Unregistered businesses face a $250 fine for the first day plus $100 for each additional day operating without a permit.
The Department of Revenue Services assigns your filing frequency based on your expected annual tax liability when you register.
The Department of Revenue Services assigns your filing frequency based on your expected annual tax liability when you register.
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Disclaimer
Xero does not provide accounting, tax, business or legal advice. This calculator has been provided for information purposes only. You should consult your own professional advisors for advice directly relating to your business.