Connecticut Economic Nexus: The $100K AND 200-Transaction Conjunctive Threshold That Keeps High-Revenue, Low-Volume Sellers Clear

How Connecticut's AND Standard Differs From the OR Majority

After South Dakota v. Wayfair (2018), the vast majority of states adopted some version of the $100,000/200-transaction threshold. But the critical difference is the conjunction: most states use OR, meaning you trigger nexus by exceeding either the revenue threshold or the transaction threshold. Connecticut chose AND, meaning you must exceed both before the state considers you to have economic nexus.

This distinction creates a meaningful safe harbor for two types of sellers:

• High-revenue, low-volume sellers — a B2B wholesaler shipping 50 large orders totaling $200,000 into Connecticut has no nexus because they fall below the 200-transaction prong, despite far exceeding the revenue prong.
• High-volume, low-revenue sellers — a seller of $5 stickers with 300 Connecticut orders totaling $1,500 has no nexus because they fall below the $100,000 revenue prong, despite exceeding the transaction count.

In an OR state, both of these sellers would have nexus. In Connecticut, neither does. The AND rule is structurally more seller-friendly because it requires a business to be both large and active in the state before the compliance obligation kicks in.

Five Worked Examples: How the AND Rule Actually Plays Out

The AND standard is the single most confusing aspect of Connecticut's economic nexus regime. These numbered scenarios show exactly how both prongs interact — something no other guide walks through with concrete numbers.

What Counts as a “Transaction” in Connecticut

Connecticut defines a transaction as each separate retail sale into the state. The details matter when you are close to the 200-transaction line:

• Multi-item orders: One order containing five products is one transaction, not five. Connecticut counts the sale, not individual line items.
• Subscription renewals: Each monthly charge for a SaaS product or subscription box counts as a separate transaction. A customer subscribing in January generates 12 transactions by December.
• Fully refunded orders: A sale that is fully refunded reduces your transaction count by one. The sale is treated as if it never occurred.
• Partially refunded orders: A partial refund (e.g., one item returned from a three-item order) still counts as one transaction. The revenue figure is reduced, but the transaction stands.
• Free-shipping thresholds and bundled orders: If a customer places two separate orders on the same day, those are two transactions. If they combine items into one order to qualify for free shipping, that is one transaction.

For SaaS companies, the subscription-renewal rule is critical. A SaaS product with 20 Connecticut customers paying monthly generates 240 transactions per year — already past the 200-transaction prong. The only question is whether revenue also exceeds $100,000. At $42/month per customer ($10,080 annual revenue from those 20 customers), the answer is no. Scale to 100 customers at $100/month, and both prongs are easily met.

The 12-Month Rolling Lookback Period

Connecticut measures both prongs over the preceding 12-month period. This is a rolling window, not a calendar-year test. You must continuously monitor your trailing 12-month totals for both revenue and transaction count.

A practical implication: a seller who had a strong Q4 holiday season in Connecticut may find that their rolling 12-month total crosses the thresholds in November or December. But 12 months later, as those holiday sales roll off the trailing window, the seller might fall back below one or both prongs. Connecticut has not published explicit guidance on whether nexus “turns off” once a seller drops back below — the safest approach is to continue filing once you have registered, and consult a tax advisor before ceasing to collect.

Connecticut vs. New York: Two AND Rules, Very Different Thresholds

Connecticut is not the only state with a conjunctive AND standard. New York also uses AND — but at a significantly higher revenue threshold. Here is how they compare:

The practical takeaway: New York's AND rule is far more permissive on the revenue side ($500K vs. $100K) but more restrictive on transaction count (100 vs. 200). A seller with $200,000 in revenue and 150 transactions has nexus in Connecticut (both prongs met) but not in New York (below $500K revenue). A seller with $600,000 in revenue but only 80 transactions has nexus in neither state — despite generating over half a million dollars in each.

Marketplace Facilitator Exclusion in Connecticut

Connecticut's marketplace facilitator law, effective December 1, 2018, requires qualifying marketplaces to collect and remit Connecticut sales tax on behalf of third-party sellers. This is the same multi-channel dynamic that applies in most states: sales facilitated by Amazon, Etsy, Walmart Marketplace, and similar platforms are excluded from your personal threshold calculation for both revenue and transaction count.

As shown in Scenario 4 above, this exclusion can be the difference between having nexus and being completely clear. Sellers operating on multiple channels should carefully separate their marketplace-facilitated sales from direct-channel sales when tracking their Connecticut thresholds.

Remember: Shopify, WooCommerce, and BigCommerce are not marketplace facilitators. They are commerce platforms. All sales through your own storefront on these platforms are direct sales that count toward both Connecticut thresholds.

Registration via myconneCT: Step-by-Step

Once you determine that your rolling 12-month activity exceeds both $100,000 in gross revenue and 200 transactions into Connecticut, you must register to collect and remit Connecticut sales tax. Registration is done through myconneCT, the state's online tax portal.

1. Go to portal.ct.gov/DRS/myconneCT and create an account. You will need your federal EIN and basic business information.
2. Select “Register a New Business” and choose Sales and Use Tax as the tax type. Remote sellers select the out-of-state seller designation.
3. Provide your business details: legal name, DBA, physical address, mailing address, NAICS code, the date you first exceeded both thresholds, and ownership information.
4. Submit and await confirmation. The Department of Revenue Services (DRS) typically processes registrations within a few business days. You will receive a Connecticut sales tax registration number and your assigned filing frequency.
5. Begin collecting Connecticut sales tax on all taxable sales shipped to Connecticut customers. The statewide rate is 6.35% — no local rates to manage.

Connecticut does not charge a registration fee for remote sellers. The flat 6.35% statewide rate with no local taxes makes Connecticut one of the simplest states to administer once you are registered — no address-level rate lookups, no jurisdiction-specific returns.

Filing Frequency and Due Dates

Connecticut assigns filing frequency based on your expected annual tax liability:

• Monthly filers: Required when annual liability exceeds $4,000. Returns due by the last day of the month following the reporting period.
• Quarterly filers: For sellers with annual liability between $1,000 and $4,000. Returns due by the last day of the month following the quarter end (April 30, July 31, October 31, January 31).
• Annual filers: For sellers with liability under $1,000. Return due by January 31 for the prior calendar year.

All returns are filed through myconneCT. Connecticut requires destination-based sourcing for remote sellers, but since the state has a single statewide rate, the sourcing rule has no practical impact on rate calculation — it is 6.35% regardless of the customer's address within Connecticut.

Physical Nexus vs. Economic Nexus in Connecticut

Economic nexus is not the only way to trigger a Connecticut sales tax obligation. Physical nexus still applies. If you have employees, inventory, a warehouse, or an office in Connecticut, you have physical nexus regardless of your sales volume or transaction count. The AND threshold only governs economic nexus for remote sellers with no physical presence.

A seller using a third-party fulfillment center in Connecticut has physical nexus through inventory storage. That seller must register and collect regardless of whether they meet the $100,000/$200-transaction thresholds. The $100K economic nexus standard is specifically for sellers whose only connection to the state is through sales — no people, no property, no inventory.

Historical Context: From $250K to $100K

Connecticut was among the first states to enact an economic nexus law after Wayfair, effective December 1, 2018. The original threshold was $250,000 in gross revenue AND 200 transactions. On July 1, 2019, the revenue prong was reduced to $100,000, bringing the dollar figure in line with the national majority while retaining the conjunctive AND standard.

Sellers who were active in Connecticut between December 2018 and June 2019 and exceeded $250,000 AND 200 transactions during that window may have retroactive exposure if they never registered. If you believe this applies to your business, a voluntary disclosure agreement can limit your lookback period and reduce or eliminate penalties.