Connecticut taxes through the Connecticut Department of Revenue Services at a 6.35% statewide base rate, with local rates stacking on top and economic nexus for remote sellers at $100,000 in sales AND 200 transactions. Filing runs monthly, quarterly, or annually by liability. For e-commerce & online sellers, that combination is what decides how much of your month-end is bookkeeping and how much is compliance.
Employer registration runs through the Connecticut Department of Labor, and the entity is registered with the Connecticut Secretary of the State. One of the few states requiring BOTH thresholds to be met, not either — so high-value, low-volume sellers often are not required to register.
Sales tax authority
Connecticut Department of Revenue Services — 6.35% statewide base rate
Economic nexus
$100,000 in sales AND 200 transactions
Filing cadence
Monthly, quarterly, or annually by liability
Employer registration
Connecticut Department of Labor
Entity registration
Connecticut Secretary of the State
Sales tax nexus in Connecticut
Economic nexus in Connecticut is $100,000 in sales AND 200 transactions. For e-commerce & online sellers, that threshold is the one to watch, because it is reached by selling into the state — no office, no staff, no physical presence required. Once you cross it you are expected to register with the Connecticut Department of Revenue Services and begin collecting. We track your Connecticut sales against it and tell you before you cross, not after.
Marketplace sales vs. your own channels in Connecticut
Marketplace facilitator rules mean large platforms generally collect and remit Connecticut tax on sales made through them. Your own site, wholesale, and direct sales are a different matter — those remain yours to collect and report. Keeping the two streams separate in the books is what makes the Connecticut Department of Revenue Services return match reality.
Connecticut rates and sourcing
The Connecticut statewide base rate is 6.35%. Local rates stack on top and are generally sourced to the delivery address, so the effective rate varies within the state. Getting sourcing right is what keeps the liability account matching what you actually collected.
Filing cadence in Connecticut
Connecticut assigns filing frequency by liability — monthly, quarterly, or annually by liability. Because Connecticut includes an annual bracket, a low-volume seller here can go a full year between filings, which is exactly when a liability account drifts unnoticed. We reconcile it monthly regardless of when the return is due.
We keep the books. You run the business.
Categorization, reconciliation, month-end close, and clean financial statements — with nothing left for you to chase.
View pricingHow It Works
Free review
We check where your e-commerce & online sellers books stand and whether Connecticut activity has crossed $100,000 in sales and 200 transactions.
Register what is needed
Accounts set up with the Connecticut Department of Revenue Services, plus the Connecticut Department of Labor if you have employees here.
Catch up
Back periods cleaned up at a fixed quoted price, including any Connecticut liability that was collected but never reconciled.
Close on cadence
Monthly close worked backward from your Connecticut due dates — monthly, quarterly, or annually by liability.
E-Commerce & Online Sellers Bookkeeping in Connecticut — Frequently Asked Questions
Do I need to register for sales tax in Connecticut?
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How often would I file in Connecticut?
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Who do I actually deal with in Connecticut?
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Do you prepare my income tax return?
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E-Commerce & Online Sellers bookkeeping in Connecticut
Book a free consultation. We will check where your books stand and whether your Connecticut activity has crossed $100,000 in sales and 200 transactions.
- Done-for-you
- Solo or group
- Nationwide
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