Named second driver: must you tell your insurer?

Yes, once their use becomes regular. A relative who borrows the car once stays covered by compulsory third-party liability (RC, responsabilité civile) with no paperwork; someone who takes it every week must be named in the policy. In Belgium, leaving them out does not cost the same under RC as under omnium (comprehensive cover), nor in good faith as in bad.

Do you have to declare a second driver?

Yes, and timing matters more than the label. A second driver is someone who uses your car in a regular and predictable way without being its main user: the partner who takes it on Saturdays, the daughter who drives it to classes on Tuesdays and Thursdays.

The standard contract imposed by the Royal Decree of 16 April 2018 requires the policyholder to declare accurately, when signing, everything used to assess the risk (article 2), then any significant and lasting increase in risk during the contract (article 6). A new regular driver is part of that.

General conditions change the vocabulary, not the principle. ACM Insurance, in its general conditions dated September 2025, defines an "authorised driver" as anyone other than the drivers named in the particular conditions who may exceptionally drive the vehicle. The whole rule sits in that adverb.

Main, second or occasional driver: which status fits whom?

The test is neither ownership nor family ties. It is frequency.

Test-Achats, the Belgian consumer association, notes that some insurers cap occasional use at three times a month. That is not a legal rule: only the definition in your general conditions decides.

What does a forgotten second driver cost under RC?

Less than people think if the omission was in good faith, far more if it was deliberate.

Article 45 of the standard contract separates two cases. Unintentional omission: the insurer compensates the victim, then may turn to the policyholder, up to a maximum of €250. Intentional omission: recourse covers all of its net outlay, and article 3 also lets it ask for the contract to be declared void. Take an at-fault collision that costs the insurer €18,000, caused by a 20-year-old daughter who drives three times a week without being named. If her parents genuinely did not know she had to be declared, recourse is capped at €250. If they knowingly presented her as occasional to pay less, the insurer can claim the full €18,000.

Good faith is hard to prove after the fact.

Is the rule the same under omnium?

No. Omnium is not governed by the RC standard contract; it falls directly under the Insurance Act of 4 April 2014. For an unintentional omission attributable to the policyholder, article 60 lets the insurer reduce its payout in proportion to the premium paid versus the premium that should have been paid. Example: an omnium premium of €700 instead of the €900 the policy would have cost with the second driver; on €6,000 of own damage, the payout drops to about €4,667, before the deductible. An intentional omission (article 59) opens the way to nullity.

A young second driver: which deductible?

This is the case where declaring saves money. Ethias says so on its page on young occasional drivers, published in January 2021: for a driver under 26, an €800 deductible applies after an at-fault accident if they are not listed in the policy. If they are, a €500 deductible only applies to at-fault accidents on Friday, Saturday and Sunday nights and on the eve of public holidays, between midnight and 7 a.m. In return, the same page announces a 15% surcharge on the RC premium.

The age threshold and the amounts vary from one policy to the next. Other companies set the cut-off at 23.

Does a second driver earn bonus?

Not on a degree of their own, since the bonus-malus degree (the Belgian no-claims scale) belongs to the policyholder's contract. They do build a history, and that is where Belgian insurers diverge most.

AG Insurance, in an August 2024 article, advises adding your child to your policy as a habitual driver: the years of experience gathered will count later when setting their starting degree, otherwise set at 11 for private use. Ethias, by contrast, asks that a young person who drives the vehicle habitually have the policy moved into their name, with a bonus-malus recalculated on their profile. ACM sets an entry degree of 11, lowered by one point per year of licence if you can prove you were validly insured for twelve consecutive months during the last five years, without saying whether being named on a parent's policy is enough.

Three insurers, three readings. Ask in writing before building a plan on it.

Who takes the malus after a claim by the second driver?

The policyholder. But the claims history certificate lists, for each claim, the name and date of birth of the driver who caused it: a future insurer will know who was at the wheel. One-off lending follows the same mechanics, covered in our article on lending your car.

Four points to check in your particular conditions

• The named list of drivers, with their status (main, habitual, named occasional).
• Any exclusive-driving clause, which leaves anyone not named outside cover.
• Increased deductibles tied to the driver's age or absence from the policy, under RC as well as omnium.
• The definition of an occasional driver in the general conditions, to see where your insurer draws the line.

An ambiguous line gets clarified by email with your broker or insurer. If a disagreement persists, the Insurance Ombudsman, Belgium's free out-of-court complaints service, reviews the case, and the FSMA, the Belgian Financial Services and Markets Authority, supervises how intermediaries follow conduct rules.

Verdict for a household with several drivers

To compare policies on their driver rules rather than on the advertised premium, start from the ranking of the best car insurers, take the quiz, then move to the offer comparison. Our guide to car insurance for young drivers takes the question further for a first policy in their own name. This site informs and compares; it is not an insurance intermediary and gives no individual recommendation.