What insurers actually charge for your children

Children are priced differently to adults on a family policy, often with a condition that's easy to miss on the headline offer. Here's what to look for, and what to ask before you apply.

Work through your children's ages person by person See how adding your family to an employer scheme affects your tax

Why children's pricing rules change what a second child costs

A family policy rarely prices each child the way it prices the adults on it. Many insurers charge a single premium for children under an age limit, whatever the number of children, or they charge for the eldest child only and carry younger brothers and sisters without a further charge until that eldest one ages out. Either approach changes what adding a second or third child costs, and that difference rarely shows up on a quote page by itself.

What the eldest-child rule does to the arithmetic

Where an insurer runs an eldest-child-only offer, the premium for the children on the policy is set by whichever child is oldest, as long as that child is under the stated age limit. Add a second child while the eldest still sits under that limit and the household premium does not move. Once the eldest child passes the limit, the next-oldest becomes the one the premium is based on, and the household can see a charge appear where there had not been one before.

Why this is hard to see on the headline page

Insurers often advertise the eldest-child-only offer as a feature of the policy. The detail that decides whether it helps your family sits further into the terms than the headline, where it is set out at all. That detail includes the age at which the offer stops applying, whether it covers stepchildren and adopted children on the same basis as a natural child, and whether a newborn is added to the free group automatically or needs a request. Some insurers publish no rule on this at all, which tells you the answer will come from asking.

Working through your own household, child by child, is one way to see where a rule like this might apply. The person-by-person guide shows how to go through each child by age and spot where it might be worth checking with an insurer.

Before you apply

What to ask an insurer about covering children

A family policy's price on paper can hide several separate rules about children. Before you apply, it helps to ask about each of these directly.

  • Whether only the eldest child is charged for

    Some insurers price a family policy so that younger children are covered alongside a fee-paying eldest child, up to an age limit — ask whether this applies to the policy you're looking at and what that limit is.

  • What happens when a child reaches the age limit

    Children's cover often runs out at a set age, after which a child moves onto adult pricing or needs separate cover — ask what happens on that birthday.

  • What happens to the younger children once the eldest ages out

    Where a policy prices around an eldest child under a certain age, ask whether a younger sibling then takes on the eldest-child rate, or whether the household simply loses the arrangement altogether.

  • Whether a newborn can be added outside renewal

    Ask if there's a window for adding a baby to the policy as soon as they're born, and whether that addition goes through the same underwriting as any other new family member.

  • Who is excluded from a children's offer

    Reduced-price or free child cover sometimes excludes step-children, grandchildren living in the household, or children beyond a certain number — ask for the exact wording.

  • Whether the rule can change at renewal

    A pricing arrangement for children may apply only at the point of taking out the policy — ask whether the insurer can alter or withdraw it when the policy comes up for renewal.

If an insurer's own terms don't mention one of these points, that's worth raising directly — the absence of a published rule isn't the same as no rule at all.

What it means when an insurer doesn't publish a children's pricing rule

Not every insurer sets out how it treats children on a family policy in the same place, and some set it out nowhere at all. That gap is worth noticing. If a children's pricing rule isn't written down anywhere you can find it, the fair reading is that you ask for it directly, before you commit to anything.

You're entitled to ask. An insurer or broker has to give you appropriate information about a policy in good time, and in a form you can understand (FCA ICOBS 6.1.5R, read 2 October 2026). Whether a child moves onto an adult premium at a certain age, or what happens when the eldest child in the household passes that age, falls squarely within what you're owed an answer about before you decide anything.

What to ask when nothing is published

  • Whether there's an age limit after which a child's premium changes
  • What happens at renewal if the eldest child passes that limit while a younger child is still covered
  • Whether a newborn can be added mid-policy, and within what window

Get the answer in writing where you can, so it sits alongside the rest of your policy documents.

Insurance Premium Tax on your family's policy

Private medical insurance carries Insurance Premium Tax, a tax built into the premium itself. It applies at the standard rate of 12% to most general insurance, including a family policy, so the quote your insurer gives you for covering your children already has this folded in (GOV.UK, read 2 October 2026).

Where the rate is published

GOV.UK publishes the standard rate for Insurance Premium Tax, which is the source for the 12% figure above. Rates set by government can change, so it's worth checking the current figure there.

This tax is separate from the benefit in kind that applies if your family is covered through an employer's scheme. If that's your situation, family cover through an employer scheme works through a different tax mechanism, which is worth understanding before you decide whether to add anyone to it.

Questions parents ask about children's cover

At what age does a child usually stop being covered on a family policy?

Insurers set their own cutoff, often somewhere in the late teens or early twenties, and some extend it further if the child stays in full-time education. There is no single age that applies everywhere, so check the policy wording for the age at which a child moves off the family plan, or needs a policy of their own.

Can a newborn be added to the policy straight away?

Many insurers let a newborn join without the medical underwriting a new adult applicant would normally go through, provided you add them within a set window after birth, often a matter of weeks. Miss that window and the child may need to apply afresh, answering health questions you would rather have skipped. Ask what the newborn addition window is, and what happens if you add the child after it has closed.

What happens when the eldest child passes the age limit?

Some insurers price a family policy by charging for the eldest child under a certain age and nothing extra for younger children until one of them becomes the eldest in turn. Once that eldest child passes the age limit, the pricing usually changes, either because they come off the family policy, move to adult pricing, or because the next child in line starts to be charged for. Ask the insurer what happens at that point.

Does every additional child add to the premium?

Not always. Under an eldest-child rule, a second or third child younger than the eldest can sometimes be added at no extra cost, because the rule prices the oldest child. Whether that applies to your family is worth checking directly with the insurer, since both the rule and its age limit vary.

Will a child be excluded from cover for a condition they already have?

Children can be underwritten in much the same way as adults, including the approach some insurers use where a recent condition is excluded for a period (moratorium underwriting). The detail of how long that exclusion lasts for a child sits with underwriting. Underwriting detail of this kind is covered more fully on PrivateHealthInsuranceQuote.co.uk.

Can an adult child stay on the family policy once they have left full-time education or started work?

Insurers generally define a dependent child by age, and sometimes by education status too. Once a child no longer meets that definition, they usually need a policy of their own. Check both the age and any education condition before assuming a child is covered simply because they still live at home.

What if the insurer does not publish a rule on how it treats children?

Some insurers do not set out an eldest-child rule, a newborn window or an age limit anywhere you can read before applying. That absence is itself worth knowing: it means the arithmetic of adding children to that policy will not be visible until you ask, so it is worth asking directly.

Does adding children to an employer's health scheme cost anything in tax?

Where an employer pays the premium for a spouse or children, that premium usually counts as a benefit in kind, taxed as part of the employee's income. How that works, including a change to how it appears on payslips from April 2027, is covered on the page about family cover through an employer scheme.

See what these rules mean for your own children

Go through each child's age and see where the eldest-child rule could apply to your family, as a question to take to an insurer.

Work through your household person by person Read about family cover through an employer scheme