What is trailing nexus?

Most states make you keep filing for a while after you drop below their threshold. California runs through the next full calendar year. Texas uses a rolling twelve months. We track each state's rule so you cancel on the right date, not too early.

Will I get in trouble for canceling a permit?

Not if you do it in the right order. We file every outstanding and final return first, then guide the cancellation. The real risk is canceling early or skipping a final return, which is exactly what we prevent.

Which platforms do you support?

Amazon, Shopify and WooCommerce, with BigCommerce, Etsy, Walmart and eBay supported through manual entry. You can also enter your states by hand on any platform.

Do you file my returns?

Yes. During the wind-down we file the zero-dollar returns so nothing lapses, and once you're deregistered in a state there's nothing left to file.

How is this different from Avalara or TaxJar?

They help you register and file more. We help you deregister and file less. We only charge for the states you keep.

No. TrailingZero is software that flags deregistration opportunities and handles filings. For complex situations we tell you when to bring in your accountant.

Is TrailingZero live?

Yes. Free audits are live now — run yours in minutes. Connect a store read-only or enter your registered states by hand to see which you can cancel and what it saves.

Do marketplace sales count toward economic nexus in Connecticut?

Yes, they count toward the threshold even though the marketplace collects the tax.

No. This page is general education built from public sources and the rules change often. Confirm your specific situation with the state's tax authority or your accountant before you register or deregister.

Economic nexus

Connecticut economic nexus threshold

Connecticut's economic nexus rule decides when out-of-state sellers must collect sales tax. Here's the current threshold, how it's measured, and how the transaction-count rule has changed.

By John DoeReviewed by Jane Doe, CPAUpdated June 2026How we verify

Verify before you act

Sources currently disagree on some details for this state — especially the trailing-nexus window and how to deregister — so we've flagged it for manual review. Treat this page as a starting point and confirm with Connecticut Department of Revenue Services (DRS) or a tax professional before you register or deregister.

Sales threshold: $100,000
Transaction threshold: 200 transactions
Logic: sales and transactions
Measured over: 12-month period ending September 30
Effective: December 2018

Source: Connecticut Department of Revenue Services (DRS)

Nexus & savings calculator

Estimate whether you still have nexus in Connecticut — and what canceling could save.

State

Annual sales into Connecticut

Transactions (orders) per year

I have physical presence hereFBA/3PL inventory, an employee, or an office in Connecticut

Filing frequency

Cost per return

Physical presence
Sales over $100,000
Over 200 transactions

Likely eligible to cancel

Based on these numbers you likely no longer have nexus in Connecticut. You can usually deregister after clearing the trailing-nexus window and filing your final return.

Trailing nexus: Connecticut has limited or no trailing-nexus window — you can generally deregister once your nexus has ended and final returns are filed.

You could stop paying

$600/ yr

How to cancel in Connecticut →

Estimate only — general education, not tax advice. Confirm with Connecticut's tax authority before you register or deregister.

What is economic nexus in Connecticut?

Economic nexus means you can owe sales tax in Connecticut based purely on your sales volume there — no physical presence required. It traces to the 2018 South Dakota v. Wayfair decision. Connecticut's threshold took effect December 2018.

Today the threshold is $100,000 in sales and 200 transactions, measured over 12-month period ending September 30.

The transaction-count history

Connecticut still counts transactions: crossing 200 transactions creates nexus even on modest revenue.

If your only nexus reason is the transaction count, watch it closely — a low-revenue, high-order business can cross it.

What counts toward the threshold

Gross receipts from retail sales into Connecticut; excludes sales for resale (with valid resale certificate); tax-exempt sales (e.g., nonprofit/government) are counted toward threshold even though no tax is collected on them

Marketplace-facilitated sales (Amazon, Etsy, eBay) count toward your Connecticut threshold even when the marketplace remits the tax.

Where TrailingZero fits

TrailingZero connects to your store read-only, maps where you actually have nexus state by state, and tracks your sales against Connecticut's threshold so you register only when you truly cross it — and deregister when you fall below. During any wind-down it can file the zero-dollar returns so nothing lapses — and you only pay for the states you genuinely keep. Run a free audit anytime; this page is free education either way.

Connecticut Economic nexus FAQ

What is the economic nexus threshold in Connecticut?: $100,000 in sales and 200 transactions, measured over 12-month period ending September 30, in effect since December 2018.
Did Connecticut remove the 200-transaction rule?: Connecticut still counts transactions: crossing 200 transactions creates nexus even on modest revenue.
Do marketplace sales count toward economic nexus in Connecticut?: Yes, they count toward the threshold even though the marketplace collects the tax.
Is this tax advice?: No. This page is general education built from public sources and the rules change often. Confirm your specific situation with the state's tax authority or your accountant before you register or deregister.

See what you can stop paying in Connecticut

Run a free audit and see which registrations you can drop — in minutes, no card required.

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Other states

See all states →

Sources

Primary sources reviewed for this page. Data current as of June 2026.

TrailingZerois software, not a CPA or law firm, and this page is general education — not tax or legal advice. State rules and thresholds change frequently; confirm your situation with the state's tax authority or your accountant before you register or deregister. See how we research and review this data in our editorial & accuracy policy.