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.

Does Connecticut have a sales tax?

Yes. The statewide base rate is 6.35%. Remote sellers collect it once they have nexus.

When do I have to register for sales tax in Connecticut?

When you have physical presence there or cross $100,000 in sales and 200 transactions over 12-month period ending September 30.

Can I cancel my Connecticut registration if I'm under the threshold?

Generally yes, after clearing Connecticut's trailing-nexus window and filing a final return.

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.

Seller's guide

Sales tax in Connecticut

Everything an online seller needs to know about sales tax in Connecticut: the rate, when you have to register, marketplace rules, filing, and when you can cancel — in plain English.

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.

Statewide base rate: 6.35%
Economic threshold: $100,000 in sales and 200 transactions
Marketplace law: Yes
Trailing nexus: Minimal
Tax authority: Connecticut Department of Revenue Services (DRS)

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.

Do you need to collect sales tax in Connecticut?

You have a duty to collect once you have nexus: physical presence (inventory, staff, an office) or economic nexus from crossing $100,000 in sales and 200 transactions over 12-month period ending September 30. Connecticut still counts transactions: crossing 200 transactions creates nexus even on modest revenue.

The Connecticut rate

Connecticut has a single statewide rate of 6.35% with no local or county sales taxes. Special rates apply to specific categories: 1% for computer and data processing services (including B2B SaaS); 7.35% for meals at restaurants and catering; 7.75% for luxury goods (motor vehicles over $50,000, jewelry over $5,000, clothing/footwear over $1,000 per item).

Marketplace and direct sales

Marketplaces like Amazon collect Connecticut tax for you, but those sales still count toward your threshold. Direct sales on your own store you collect yourself.

Filing and zero returns

Once registered, Connecticut requires a return every assigned period even when you owe $0 — miss one and you can face penalties. Filing frequency is assigned by DRS based on anticipated annual sales tax liability: annual filers when liability is under $1,000/year; quarterly filers when liability is $1,001–$4,000/year; monthly filers when liability exceeds $4,000/year.

When you can cancel

If your Connecticut returns are mostly $0, you may be over-registered. Canceling your Connecticut sales tax permit makes sense if you have dropped below both the $100,000 gross receipts AND 200-transaction thresholds for the 12-month period ending September 30 and no longer have physical presence in the state. The process is done online through myconneCT (More menu > Taxpayer's Updates > Close Accounts) and requires you to file all outstanding Form OS-114 returns through your closure date and then destroy your permit.

Where TrailingZero fits

TrailingZero connects to your store read-only, maps where you actually have nexus state by state, and maps your real nexus in Connecticut and flags whether you should register, keep filing, or cancel. 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 Sales tax guide FAQ

Does Connecticut have a sales tax?: Yes. The statewide base rate is 6.35%. Remote sellers collect it once they have nexus.
When do I have to register for sales tax in Connecticut?: When you have physical presence there or cross $100,000 in sales and 200 transactions over 12-month period ending September 30.
Can I cancel my Connecticut registration if I'm under the threshold?: Generally yes, after clearing Connecticut's trailing-nexus window and filing a final return.
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.