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Connecticut . Sales Tax Permit

Connecticut sales tax permit / seller's permit.

If your business sells taxable goods or services in Connecticut, you need a sales tax permit (also called a seller's permit). This guide explains nexus rules, post-Wayfair economic thresholds, the application process, and ongoing filing frequency.

Register for Connecticut sales tax →

When you need a Connecticut sales tax permit

Connecticut requires sales tax registration once your business has nexus in the state. Nexus can be:

Physical nexus . office, warehouse, employee, inventory, or affiliate in Connecticut.
Economic nexus (post-Wayfair) . reaching a sales or transaction threshold without any physical presence. Most Connecticut thresholds: $100,000 in sales or 200 transactions in the prior or current calendar year.
Click-through or marketplace nexus . commission-based referrals or marketplace facilitator obligations.

How to register for Connecticut sales tax

  1. 1Form your entity and obtain an EIN.
  2. 2Register with the Connecticut Department of Revenue. Application asks for entity info, NAICS code, projected gross sales.
  3. 3Receive your Connecticut permit number. Display it where required.
  4. 4File returns on the assigned cadence. Monthly, quarterly, or annually based on projected revenue.
FAQ

Frequently asked questions

Do I need a Connecticut sales tax permit?
If you sell taxable goods or services in {s["name"]} and have nexus (physical or economic), yes.
How much does a Connecticut sales tax permit cost?
Most states issue sales tax permits free. Some charge a small registration fee.
What is the Connecticut economic nexus threshold?
Common thresholds: $100,000 in sales or 200 transactions per year. Verify current {s["name"]} thresholds with the Department of Revenue.
Do I need to register for sales tax if I sell on Amazon or Etsy in Connecticut?
Marketplace facilitator laws often shift collection to the platform. You may still need to register and file zero-returns. State-specific.
How often do I file Connecticut sales tax returns?
Monthly, quarterly, or annually based on projected revenue. The Department of Revenue assigns frequency at registration.
What if I sell only digital products in Connecticut?
{s["name"]} taxability of digital products varies. Some are taxable, some not. Check current rules.
Does File.Business handle Connecticut sales tax registration?
Yes. We complete the application, deal with the Department of Revenue, and deliver the permit.

Ready to handle this the easy way?

Five minutes per filing. State fee passed through at cost. Audit trail and deadline tracking included.

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Disclosure. File.Business is a private business filing and compliance service. We are not a government agency and are not affiliated with the CT Secretary of the State or any Secretary of State office. You may file directly with the CT Secretary of the State. Information on this page is for general guidance only and is not legal, tax, or accounting advice. Fees and deadlines verified against the CT Secretary of the State as of June 2026 and may change. For entity-specific guidance, consult a licensed Connecticut attorney or CPA.

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File.Business is a private business filing and compliance service. We are not a government agency and are not affiliated with any Secretary of State office. You may file directly with the appropriate state agency. SOC 2 Type II audited. 220,000+ businesses formed since 2017.