E-Commerce & Online Sellers Bookkeeping in Connecticut

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. Because Connecticut runs an annual bracket, low-volume e-commerce and online sellers can go twelve months between returns — which is exactly how long a liability account can drift before anyone looks at it.

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

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%. That sits mid-table nationally, with local rates layered on top and sourced to the delivery address rather than to your own location. Sourcing is where this is won or lost, and with economic nexus set at $100,000 in sales and 200 transactions, it becomes your problem the moment that threshold is crossed.

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.

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How It Works

Free review

We check where your e-commerce and 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 e-commerce and online sellers need to register for sales tax in Connecticut?

If you cross $100,000 in sales and 200 transactions, Connecticut generally expects you to register with the Connecticut Department of Revenue Services and begin collecting. Physical presence also creates an obligation. We track your Connecticut activity against the threshold and flag it as you approach — whether to register, and how to handle any prior period, is a decision to make with your CPA or a tax professional.

How often do e-commerce and online sellers file in Connecticut?

Connecticut sets it by liability — monthly, quarterly, or annually by liability — and moves you between brackets as volume changes, so it is worth confirming each year rather than assuming. We close the month against the Connecticut Department of Revenue Services calendar you are actually on.

Which Connecticut agencies do e-commerce and online sellers deal with?

Three: the Connecticut Department of Revenue Services for sales tax, the Connecticut Department of Labor for employer registration and unemployment, and the Connecticut Secretary of the State for the entity itself. Separate account numbers, separate portals, separate deadlines — and a notice from one tells you nothing about your standing with the other two.

Do e-commerce and online sellers pay Connecticut state income tax?

Connecticut does levy a state income tax, so there is a state return in addition to the federal one. We keep the books that those filings are built from and hand them to your CPA or tax preparer reconciled; we do not prepare or file income tax returns ourselves.

Do you prepare income tax returns for e-commerce and online sellers?

No. We are a bookkeeping firm, not a licensed CPA firm or a registered tax preparer, and we do not prepare or file income tax returns. We prepare and file sales and city tax returns and 1099 information returns, which are bookkeeping functions, and we hand off clean reconciled books to your CPA or tax preparer for anything income-tax related.

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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.

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