Turn in your plates/cancel the registration.

But where and how

Cancel your registration. Towns get their information from DMV. Maybe wouldn't hurt to notify your town's assessor also

https://portal.ct.gov/dmv/vehicle-services/cancel-registration-plates?language=en_US

Did you get any kind of paperwork that you no longer own it?

Just went through this, go to motor vehicle and cancel your registration. Then take the paperwork to the assessors office in your town.

Cancel registration, send plates to DMV.

How is the car not in your possession? Even if totaled it is still yours.

What would you do with a totaled car babe

You should have received documentation from whomever took the car.

Cancel the registration first, insurance second. If you cancel insurance first, the DMV will fine you $200.

The DMV

Cancel registration online, keep receipt, take insurance off after or you will incur the $200 fine. Keep receipt, bring to town hall to make sure you are off the tax rolls. If not have your insurance agent/company write a letter with VIN number and date the vehicle was removed.

If the town charge you, give them the insurance claim stating total loss. They will adjust it from date of lost

Bill of sale to the assessor, boom done

All you have to do is cancel your reg on the DMV website. You don't need to send plates back, you can destroy them and throw in garbage. You can also cancel your insurance BEFORE without any fines/fees like someone mentioned as long as the vehicle isn't leased or financed, and even then you still most likely would not be charged anything.

cancel registration, bring assessor copy of cancellation and total loss letter from your insurance company

You don't have to do that anymore.

Give cityhall your total loss papers.

Plates DO NOT have to go back to the DMV anymore. Save yourself the headache and cancel your registration online. The DMV should automatically notify the tax assessor in your town that the registration has been cancelled but print out and save the cancelled registration receipt just in case. If you want to transfer your plates to a new car select “held by customer” when the website asks for the plate disposition. If you select “cancelled” or “lost/stolen” at that prompt I’m pretty sure the plates can’t be transferred.

Car insurance is a cluster fuck. Wicked unprofessional industry. It’s a complete pain in the ass to figure out what’s going on sometimes

Well that's good to know. And also sucks. A few years ago I tried to do it this way/backwards and my insurance wouldn't let me; they required proof of canceled plates before they would cancel my (prepaid) insurance plan.

Edit: whoops thought this was the MA sub. So doesn't apply??