sales tax · 2026
Connecticut sales tax registration threshold
Gross sales into Connecticut AND 200+ separate transactions - both tests must be met.
- Measured over
- Trailing 12 months ending September 30
- On crossing
- Register for Connecticut sales tax
What is the Connecticut sales tax registration threshold?
The Connecticut sales tax registration threshold is $100,000 in sales and 200 separate transactions, both of which must be met, measured over trailing 12 months ending September 30. Cross it and you must register for Connecticut sales tax with the Connecticut Department of Revenue.
What's different about Connecticut
Connecticut is one of only two states where BOTH tests must be met - $100,000 in sales AND 200 transactions. Hitting just one does not create nexus.
When do you need to register?
Economic nexus: once your sales into the state pass its threshold (commonly $100k or 200 transactions), you must register and collect that state's sales tax.
Deadline: Register before your next sale - many states apply nexus prospectively from the crossing.
How to register in Connecticut
- 1Register for a sales-tax permit with the state's Department of Revenue.
- 2Enable tax collection for that state in your checkout / Stripe Tax.
- 3Remit collected tax on the state's filing schedule.
- 4If you're crossing several states, consider a filing service (TaxJar / Avalara).
Connecticut Department of Revenue — official guidance Sales Tax Institute - Economic Nexus
Don't track Connecticut by hand.
TaxesRadar reads your Stripe & Paddle sales and warns you the moment you approach this threshold - across every country and US state at once.
Connecticut sales tax threshold - FAQ
What is the sales tax registration threshold in Connecticut?
$100,000 in sales AND 200 separate transactions - both must be met, measured over trailing 12 months ending september 30. Crossing only one does not create an obligation.
When do I need to register for sales tax in Connecticut?
Economic nexus: once your sales into the state pass its threshold (commonly $100k or 200 transactions), you must register and collect that state's sales tax. Register before your next sale - many states apply nexus prospectively from the crossing.
Does TaxesRadar file my sales tax for me?
No. TaxesRadar watches your Stripe and Paddle sales, warns you before you cross this threshold, and gives you the registration checklist. Filing itself is handed to specialist partners.
Other sales tax thresholds
Guidance, not tax advice. Confirm the specifics for your situation with a qualified professional. Threshold shown for 2026; last verified 2026-07-27 against Connecticut Department of Revenue. Rules change - TaxesRadar keeps them current.