Connecticut sales tax, handled.
If you’re selling on Shopify, Amazon, or D2C into Connecticut, district rates change every month. We file, reconcile, and defend — so you ship and grow.
From $59/return for occasional filers. Flat $209/mo if you’re in 10–19 states. No contracts.
Connecticut sales tax at a glance
Verified against Connecticut Department of Revenue Services published guidance, current as of June 2026.
Statewide base rate
6.35%
State base rate plus local district add-ons.
Max combined rate
6.35% (no local)
Some local jurisdictions can reach the maximum combined rate.
Economic nexus
$100,000 AND 200 transactions
Gross sales threshold, current or prior calendar year.
Marketplace law
Since Dec 2018
Marketplace facilitators collect & remit. Sales still count toward your threshold.
Filing frequency (monthly / quarterly / annual) is assigned by Connecticut Department of Revenue Services based on your collected volume. Returns generally due last day of the month following the period; quarterly prepayments due the 24th of the first two months of each quarter.
End-to-end Connecticut sales tax handled
Every plan includes Connecticut Department of Revenue Services registration, ongoing return prep and filing, district-rate breakdowns, and a dedicated account rep. Add audit defense or special data processing when you need them.
Connecticut Department of Revenue Services registration
Seller’s permit application, multi-location handling, and use-tax registration. $125 flat per registration.
Monthly & quarterly returns
We prepare, reconcile, and file your Connecticut returns — including district-level allocation across all 1,000+ jurisdictions.
Marketplace reconciliation
Separate marketplace-facilitator sales from your direct sales so you don’t double-collect or under-report.
Notice handling
Connecticut Department of Revenue Services notices come to us first. We respond, document, and keep your account in good standing.
Audit defense
Representation during Connecticut Department of Revenue Services audits — $125/hour. We’ve been through hundreds of Connecticut audits since 2002.
Voluntary disclosure
If you’re behind on Connecticut filings, we negotiate VDAs with Connecticut Department of Revenue Services to reduce penalties and back-period exposure.
Transparent monthly pricing. No contracts.
Pick the tier that matches the number of states you file in. Connecticut counts as one state regardless of how many districts apply. Per-return fee is flat: $49 on Tiers 1–3.
Tier 0
$0/mo
- Single state or no monthly returns
- $59 per return
- Connecticut Department of Revenue Services registration available
- Account maintenance included
Tier 2 · Popular
$209/mo
- 10–19 states
- $49 per return
- Marketplace reconciliation
- Notice handling
Tier 3
$359/mo
- 20+ states
- $49 per return
- Multi-entity support
- Priority response SLA
Add-ons: Special Data Processing $179/mo · Canadian Filing Support $59/mo · Audit Defense $125/hr · Connecticut Department of Revenue Services Registration $125 each. All prices current as of June 2026 — see /pricing/.
Ready to outsource Connecticut?
Speak with a Connecticut specialist. We’ll quote your tier, set up Connecticut Department of Revenue Services registration, and file your next return — usually within 5 business days.
Start filing todayFile into other states too?
We file in all 50 states. Here are the ones we file into most often alongside Connecticut: