Visit your nearest DMV location with an appointment(!) to register your new or used vehicle. Be sure to come equipped with the materials listed below:

• Bill of Sale (Form H-31)
• Connecticut Insurance Identification Card: Proof of Connecticut insurance is required. Minimum coverage includes:
  • $25,000 for bodily injury to one person
  • $50,000 for bodily injury per accident
  • $25,000 for property damage
• Connecticut Registration and Title Application (Form H-13B): Completed by the owner.
• Identification: An acceptable form of identification is required for each person listed as an owner.
• Proof of Ownership: If the vehicle was purchased in Connecticut and is newer than 20 model years old, a title is required. For vehicles 20 or more model years old, the previous owner’s registration may be used instead of a title.
• Be prepared to pay the registration fee, sales tax, and any applicable extra fees.

Source: Connecticut DMV (Register your new vehicle or vessel), Connecticut Insurance Department (Auto Insurance)

There is no statewide requirement for a new firearm owner to register a firearm.