Car insurance: which details move the premium

Third-party liability covers the damage you do to others — to their car, their property, their health. It is compulsory everywhere, because its purpose is not to protect you but the person you injure. The only question it settles is how high the sum insured should be.

Partial cover deals with damage to your own car that arises without a collision and without your involvement: theft, fire, broken glass, storm, hail, rodent damage, hitting an animal. It is the comparatively cheap cover, because its causes are rare and limited in size.

Comprehensive cover adds what you cause yourself, plus vandalism. In Switzerland that addition is sold as collision cover; in Germany it is simply part of the comprehensive policy. The meaning is the same. It is the most expensive block, because collisions you cause yourself are by far the most frequent kind of claim.

A premium is the price of an expected claim. The insurer estimates what a risk like yours costs in an average year and adds administration, reinsurance and margin on top. Everything you enter on an application serves one purpose: to sharpen that estimate.

Expected claims cost has two factors: how often something happens and how expensive it is when it does. Every rating characteristic works on one of them. Driving experience, where you live and how far you drive mostly explain frequency; vehicle value, repair costs and parts prices mostly explain severity. A characteristic moves the premium exactly to the extent that it explains one of those two.

Arithmetically the premium is a product, not a sum: a base premium is multiplied by factors, then the no-claims step is applied, then discounts and loadings for optional blocks and payment frequency. So a single unfavourable characteristic does not simply add on; it scales everything else. Which is why it pays to walk through the characteristics one by one rather than only comparing final figures.

The car's characteristics mostly drive severity, and they are the only ones you can still choose freely before buying. Germany groups them into rating classes, separately for liability, partial and comprehensive cover; Switzerland works from the vehicle's type code and its own vehicle categories. The filing system differs, the idea does not: what a model has cost statistically in the past shapes its tariff.

Which leads to something that surprises many buyers: two outwardly similar cars can sit far apart. What decides it is not size and shape but power, the price of the parts, how much work a front-end repair takes, and how often the model gets stolen.

The second group of characteristics describes not the car but how it is used. It explains frequency, and it holds the details with the most scope for later adjustment — because some of them change with your life and are not updated automatically.

Each of these details is also a duty. Permanently changing who drives, how far, or where the car is kept, without telling the insurer, saves little in the current year and risks a reduced payout when you claim. Here the honest application is not merely the clean option but the better one arithmetically.

The strongest single factor in the calculation is a clean record. Switzerland runs it as a bonus-malus step, Germany as a no-claims class. The movement is the same in both: every year without a reported claim moves you one step down, every reported claim several steps up. Recovery takes longer than the fall, and that asymmetry is the whole point.

Which produces a calculation worth doing before every claim. A small claim pays out today and costs a higher premium over the following years. If the damage is only a little above the excess, reporting it is often the more expensive deal. Many insurers also allow you to repay a small settled claim afterwards and keep your step; whether, and by when, is in the terms.

The step belongs to the person, not to the car. It travels with you when the car changes, and on a change of insurer it is transferred by a confirmation from the previous one. Within limits it can also be passed on inside a family — to a child or a partner starting a new policy. The conditions vary by company and are worth asking about before you sign.

Alongside the rating characteristics sits a list of add-ons you can switch on and off individually. It is the part of the policy you actually design — and the part where duplication hides.

The commonest silent expense is a benefit paid for twice: roadside assistance from the policy, from a motoring club membership and from the manufacturer's mobility guarantee; legal expenses from the car policy and from a general one; a breakdown package alongside a credit card benefit. An hour with every policy on the table finds such overlaps more reliably than any comparison engine.

Switching rarely pays because one company is fundamentally cheaper, but because something about your risk has changed: a different car, a move, fewer kilometres, a child with a licence, a no-claims step reached. Checking when something changes, rather than routinely every year, takes less time and finds more.

The notice periods are in the policy, not in statute alone. Both countries allow ordinary cancellation to the end of the contract period on a contractually fixed notice, plus an extraordinary right after a premium increase and after a settled claim. A change of keeper ends the contract in any case, and when you buy a different car the policy is usually transferred rather than replaced.

In practice there is one order: get the new cover confirmed in writing, then cancel the old one. For registration both countries require an electronic proof of insurance, which the new insurer sends to the licensing office directly. Without it the car stays put, however long ago the purchase contract was signed.

The biggest lever sits before the purchase, not after it. If you are torn between two cars, get a non-binding quote for each with identical details and extend the difference over the years you plan to keep it. For a young driver or a powerful car that gap regularly exceeds anything you could negotiate off the purchase price.

The second rule is just as obvious: the details have to be right, and stay right. An understated mileage, an undeclared second driver or an unreported change of use cost more when you claim than they saved over years. Insurance is the one item on a car where saving by omission is punished retroactively.

Carvexia is a party to no insurance contract and brokers none. The marketplace shows cars and prices; cover, premium and conditions are agreed with an insurer, and only what stands in their policy is binding.