“We're down to one car”: what to tell the insurer, and when

Your friend is mostly right, and I'll explain why. But you're right that the bill should go down. It just won't go down by half, and the order you do things in matters more than what you say.

Why it won't drop by half

A two-car policy isn't two identical one-car policies. Each car carries its own set of coverages, and each costs a different amount depending on the car's value, how it's used and who drives it most. On top of that, many insurers give a multi-vehicle discount for insuring more than one car. When you take one off, you lose the car's premium but also that discount on the car that's left. So the saving is the second car's share minus the discount you just lost.

If his car was older and only carried liability while yours carries collision and comprehensive, his share may have been the smaller one. That's another reason the drop can be modest.

Why he stays on as a driver

Insurers generally ask you to list everyone in the household who holds a driver's license, or at least everyone with regular access to the cars. Selling his car doesn't change the fact that he lives with you and will drive yours. Taking him off the policy while he still drives your car could leave you with a claim problem if he has an accident in it. Some insurers let a household member be formally excluded, but in that case he would not be covered driving your car at all.

The honest version is the useful one: one car, two drivers, and your insurer will rate the car based on both of you.

The timeline

When	What to do	Why
Before the sale	Check your state's plate and registration rules	Some states require you to return plates or cancel registration, and some require insurance to stay in force until you do
Before the sale	Keep his car fully insured, including for test drives	It's still your car and your liability
The day the title transfers	Call the insurer and remove the vehicle	Coverage then matches what you own
The same call	Confirm he's listed as a driver on your car	Coverage matches who drives
After the call	Watch for a refund or credit for unused premium	Policies are generally refunded or credited for the unused portion
Next statement	Check the new premium against what you were quoted	Billing systems make mistakes

The most common mistake is removing the car a week early because the buyer "is basically taking it Saturday." Until the title changes hands, keep it insured.

If there's a loan on the car

If his car has a loan, the lender is listed on the policy and the loan will be paid off at the sale. Get the payoff confirmation and the title release before the car leaves the policy. The insurer may also need to know the lienholder has been removed.

Questions to ask on the call

1. "What's the new six-month or annual premium with one car and two listed drivers?"
2. "How much of the old premium was the multi-vehicle discount?"
3. "Is there a refund or credit for the unused premium on the car we sold, and when will it show up?"
4. "Does anything else change? Discounts, payment plan, billing date?"

Write down the answers and the date of the call.

Then shop it, eventually

Your situation just changed, and a changed household is a good moment to see whether your insurer is still competitive. You don't need to rush; get the sale done and the policy right first. At your next renewal, get two or three quotes for one car with both of you as drivers.

You'll still save something. You'll just save it without a gap in coverage or a driver who isn't on the policy.