Foreign and other out-of-state sellers may have to collect Connecticut sales tax when they make retail sales into the state and meet Connecticut’s economic-nexus test, or when another connection—such as keeping inventory in Connecticut—creates nexus. The Department of Revenue Services (DRS) requires sellers who must collect to register for a Sales and Use Tax Permit through myconneCT, collect the applicable tax, and file returns.
Connecticut is comparatively straightforward to calculate: it applies a single statewide sales tax rate, with no local sales-tax add-ons. The current general rate is 6.35% on most taxable goods and services. Whether a particular product or service is taxable, how marketplace transactions affect your threshold, and what filing schedule DRS assigns still need to be checked against your business’s facts and current DRS instructions.
When foreign sellers have Connecticut sales tax nexus
Connecticut does not exempt a seller from its sales-tax rules just because the seller is based outside the United States. A foreign business selling taxable goods or services to Connecticut customers should assess whether it has nexus—the connection that requires it to register and collect. Economic activity in the state can create nexus under the remote-seller threshold, while physical presence, including inventory stored in Connecticut, can create a separate obligation.
DRS identifies out-of-state sellers that meet the state’s sales-and-receipts test as sellers required to register. Other business activities or property in Connecticut may also matter. If your business has a warehouse arrangement, employees, contractors, or other in-state activity, do not rely on the economic threshold alone; ask DRS or have a compliance professional review the facts.
Connecticut’s economic-nexus threshold for foreign sellers
The exact position here depends on your own facts, so it is worth confirming with the state directly or talking to us about your situation. The test requires both the sales-count and gross-receipts conditions; reaching only one does not satisfy the stated test.
Apply the test using the period and sales measures specified by DRS, rather than assuming that a calendar-year total or a single month’s activity controls. If your sales are close to either condition, or your accounting system treats refunds, shipping, or marketplace transactions differently, confirm the calculation with DRS. Threshold rules and administrative instructions can change, so check the current DRS page before acting.
How marketplace sales count toward nexus
Marketplace transactions need to be reviewed separately for collection and threshold purposes. A marketplace facilitator may collect and remit tax on sales it facilitates, but that does not automatically settle whether the seller has its own Connecticut registration obligation. DRS says marketplace facilitators and marketplace sellers may be required to obtain a Sales and Use Tax Permit.
DRS’s registration guidance describes the economic-nexus test in terms of the seller’s retail sales and gross receipts into Connecticut, but the available guidance does not resolve every marketplace accounting situation. Keep records that distinguish direct sales from marketplace sales and identify who collected the tax. Ask DRS how your specific marketplace transactions should be included in the threshold calculation; do not assume that marketplace-collected tax means the sales can be ignored.
Do marketplace sellers have to register?
Sometimes. A marketplace seller may need a Connecticut permit if it independently meets the state’s nexus rules or has another Connecticut connection. DRS specifically warns that marketplace facilitators and marketplace sellers may be required to obtain a permit, so selling exclusively through a marketplace is not, by itself, a safe basis for assuming registration is unnecessary.
There is an additional inventory rule: DRS says an out-of-state retailer with tangible personal property located in Connecticut on a marketplace facilitator’s premises must register even if it is below the economic-nexus thresholds. Check where your goods are physically held and who is responsible for collecting tax on each transaction. If the marketplace’s collection role or your inventory location is unclear, confirm the position with DRS before deciding not to register.
How to register for a Connecticut sales tax permit
Register online with the Connecticut Department of Revenue Services using myconneCT and the REG-1 Business Taxes Registration Application. DRS says new businesses must complete the registration electronically. The registration process is for the business that is responsible for the tax; a foreign seller should be ready to provide accurate business and ownership details and information about its Connecticut sales and activities.
DRS states that a temporary Sales and Use Tax Permit is available to print immediately after registration. Register before making taxable sales for which you are required to collect tax, and follow the permit instructions for maintaining the account and filing returns. If you are unsure whether your facts require a permit, ask DRS or get hands-on help reviewing your nexus and registration position rather than registering—or declining to register—on an assumption.
Which sales are taxable and what rate to charge
Connecticut’s general sales-tax rate is 6.35% on most retail sales, leases, or rentals of tangible personal property and on taxable services. The state also taxes many digital goods. Not every product or service is taxable, and exemptions or special rules can apply, so classify the item being sold rather than treating every order as taxable or exempt by default.
Connecticut uses one statewide rate and has no local sales-tax add-ons, making the rate calculation simpler than in states where local jurisdictions impose separate sales taxes. Check the current DRS tax information for the exact treatment of your product and any special rate or exemption before configuring checkout.
When to collect and remit Connecticut sales tax
Once your business is required to collect and has registered, collect Connecticut sales tax on taxable sales delivered into the state. A marketplace facilitator may collect and remit tax on transactions it facilitates; verify the marketplace’s role and retain transaction records so you can distinguish those sales from sales for which your business is responsible.
Collected tax is not business revenue: it is tax held for remittance to DRS. Report and pay it through the filing process and schedule assigned to your account. Do not stop filing merely because a period has no taxable sales unless DRS has confirmed that no return is required; DRS says both taxable and nontaxable sales must be reported according to the assigned monthly, quarterly, or annual frequency.
Connecticut sales-tax returns and filing deadlines
DRS assigns a monthly, quarterly, or annual filing frequency. The frequency is specific to the account, so use the schedule shown in myconneCT and the current DRS instructions rather than assuming that every remote seller files quarterly. Returns are filed through the state’s online system, and the return must report the required sales information even when the period includes nontaxable sales.
For quarterly returns, DRS’s published schedule gives the following due dates: April 30 for the January–March period, July 31 for April–June, October 31 for July–September, and January 31 for October–December. Monthly returns are due at the end of the following month. Confirm the due date and filing frequency displayed for your account, especially if a due date falls on a weekend or holiday or DRS has changed your assigned schedule.
Late filing, payment penalties, and interest
Late or missing returns and unpaid tax can lead to penalties and interest. DRS’s sales-tax information states that failure to obtain or renew a seller’s permit can result in a civil penalty of $250 for the first day of engaging in business without a permit and $100 for each following day. This makes it important to address registration promptly if you discover that your business should have been collecting.
Penalty and interest calculations depend on the type of noncompliance and the applicable current rule. DRS’s published materials describe a late-payment penalty and interest on unpaid tax, but the amount can depend on the circumstances and current instructions. Check the current DRS sales-tax guidance or contact the department to determine the amount that applies; do not rely on an estimate when preparing a late return or payment.
How Connecticut inventory can create nexus
Inventory physically located in Connecticut can create a registration obligation even when your business is based abroad and its sales are below the economic-nexus threshold. DRS specifically states that an out-of-state retailer with tangible personal property located in Connecticut on a marketplace facilitator’s premises must register even if it is under the thresholds.
Review all storage arrangements, including inventory held by a marketplace or another fulfillment provider, and establish where the goods are located. The cited DRS rule expressly addresses inventory on a marketplace facilitator’s premises; other arrangements may require a fact-specific review. If you cannot establish whether your stock is in Connecticut or how the rule applies to your storage arrangement, confirm the position with DRS before relying on a threshold-only analysis.
Get hands-on help with Connecticut sales-tax compliance
Sales Tax Compliance USA is a done-for-you service staffed by people, not sales-tax software. We can help review your Connecticut sales channels and inventory, assess whether the available facts indicate nexus, support permit registration through myconneCT, and help manage returns and filing deadlines.
Foreign sellers often need to coordinate marketplace reports, direct-store records, product taxability, and state registration details. We can help organize those facts and identify questions that need confirmation from DRS. The exact position depends on your circumstances; confirm it with the Connecticut Department of Revenue Services, or talk to us and we will check it for you.
Connecticut sales-tax compliance points for foreign and remote sellers
| Issue | Connecticut treatment |
|---|---|
| General statewide rate | 6.35% on most taxable goods and services; no local sales-tax add-ons. |
| Remote-seller economic nexus | This one varies by seller and by state, and it is the kind of detail we check for clients as part of the service — get in touch and we will confirm where you stand. |
| Marketplace sales | Marketplace facilitators may collect tax, but marketplace sellers may still have permit obligations. Confirm how marketplace transactions apply to your threshold calculation. |
| Inventory at a marketplace facilitator | An out-of-state retailer with tangible personal property in Connecticut on a marketplace facilitator’s premises must register even below the economic-nexus thresholds. |
| Return frequency | DRS assigns monthly, quarterly, or annual filing. Follow the frequency shown for your account. |
| Quarterly return due dates | April 30, July 31, October 31, and January 31 for the preceding calendar quarter, respectively. |
| Permit registration | Register electronically through myconneCT using the REG-1 Business Taxes Registration Application. |
Frequently asked questions
Does Connecticut require out-of-state sellers to collect sales tax?
Yes, when an out-of-state seller has a Connecticut registration obligation, including by meeting the economic-nexus test or having another relevant connection such as inventory in the state. Once required to collect, the seller must register and collect tax on taxable Connecticut sales. A marketplace may collect on facilitated transactions, but that does not automatically resolve the seller’s own registration duties.
What is Connecticut’s economic-nexus threshold for remote sellers?
Rather than give you a figure that may not apply to you, we would check this against the state’s current guidance for your specific setup — ask us and we will tell you exactly where you stand. Both conditions apply. Check current DRS instructions if your figures are near either threshold or your sales include marketplace transactions.
Do foreign sellers need a Connecticut sales tax permit?
A foreign seller needs a Connecticut Sales and Use Tax Permit when it is required to collect Connecticut sales tax, including when it meets the applicable nexus rules. Foreign status alone does not remove that obligation. If your sales, inventory, or other Connecticut activities make the answer uncertain, confirm your position with DRS.
Do marketplace sellers have to register in Connecticut?
Some do. DRS says marketplace facilitators and marketplace sellers may be required to obtain a permit, and a seller may have its own nexus or inventory-based obligation even when a marketplace collects tax on facilitated sales. Review your sales and inventory facts rather than assuming marketplace-only selling removes the need to register.
Do sales through a marketplace count toward Connecticut’s threshold?
DRS describes the threshold using retail sales and gross receipts into Connecticut, but the available registration guidance does not settle every marketplace accounting situation. Keep marketplace transaction and collection records, and ask DRS how your specific sales should be counted. Do not assume marketplace-collected tax means the transactions can automatically be excluded.
What sales tax rate should a seller charge in Connecticut?
The general Connecticut rate is 6.35% on most taxable goods and services, and the state does not add local sales-tax rates. Some products, services, or transactions may be exempt or subject to special treatment, so verify the taxability of what you sell using current DRS guidance.
How does a remote seller register for Connecticut sales tax?
Register online with the Connecticut Department of Revenue Services through myconneCT using the REG-1 Business Taxes Registration Application. DRS says new businesses must register electronically and that a temporary Sales and Use Tax Permit is available to print immediately after registration. Follow the account instructions for filing and payment.
Does storing inventory in Connecticut create sales tax nexus?
It can. DRS specifically requires an out-of-state retailer to register when tangible personal property is located in Connecticut on a marketplace facilitator’s premises, even if the seller is below the economic-nexus thresholds. Other storage arrangements should be reviewed based on their facts and current DRS guidance.
How we handle this for you
The mechanics in Connecticut are manageable on their own; the cost is the time it takes every single filing period, in every state you are registered in. We are a managed service: our team registers you with the Connecticut Department of Revenue Services, prepares and files your returns, and keeps you compliant period after period. You get one point of contact and one invoice — you do not get another dashboard to learn.
See our sales tax compliance services, check where you have obligations with the nexus calculator, or talk to us about Connecticut.
Official sources
- https://portal.ct.gov/drs/businesses/new-business-resource-center/registering-with-drs
- https://portal.ct.gov/drs/sales-tax/tax-information
- https://portal.ct.gov/DRS/DRS-Forms/Registration/Register-Your-Business
- https://portal.ct.gov/drs/sales-tax/other-helpful-information
Reviewed by Paul le Roux, CA(SA). Sales Tax Compliance USA handles US sales tax registration, filing and remittance for cross-border and domestic ecommerce sellers as a fully managed service.
This page is general information for educational purposes and does not constitute legal or tax advice. Sales tax rules change and depend on your specific facts. Consult a qualified tax professional about your own position.
Related guides
Other Connecticut guides: Amazon FBA · Economic nexus · Filing · Permit · Registration
Foreign sellers in nearby states: New York · Massachusetts
Selling into several states? Check where you have crossed a threshold with the free nexus diagnostic, see the full 51-state threshold table, or browse every state guide.