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Child support calculator for a child — estimated amountTable of contents
Child support is one of the key obligations in family law. Most often it concerns children, but in specific situations the maintenance duty can also cover other close relatives. Below is a clear explanation: who is entitled, when the obligation arises, and how the court assesses the amount.
This guide is practical and focuses on the kinds of evidence and arguments that typically matter in support cases.
If you need the procedure in detail, see: How to file a child support claim and Child support case — how the proceedings look.
Child support is a financial obligation for the maintenance and development of the entitled person. In practice it usually concerns children, but the duty can also apply to a spouse, parents or other relatives if statutory conditions are met.
The obligation arises when the entitled person cannot support themselves or their justified needs are not met by the obligated person. For children this means they are entitled to a standard of living similar to the parents’ standard. The outcome is always based on a court’s assessment, not an automatic rule.
In some situations support may also be owed to a spouse after divorce or separation. In practice the key issues include need (or significant deterioration of the spouse’s situation) and fault in the breakdown of the marriage. See: Spousal maintenance — rules, limits and examples.\n\nSupport can also be owed by grandparents or adult children toward a parent, but only in exceptional cases. For grandparents, the duty is generally subsidiary — it applies when parents cannot provide support. For adult children, a parent usually must show need and the children’s ability to pay. See: Child support from grandparents and Support for a parent from adult children.
There is no single age that ends the obligation. As a rule, it lasts until the child can support themselves, which may include continued education or special health circumstances. See: How long child support is paid and Child support for an adult child.
In practice the court checks whether the child genuinely pursues self‑reliance, for example by continuing education in a real and consistent way. It is worth collecting evidence that shows educational activity or health limitations.
If the child changes their study path or takes breaks, the court evaluates whether this is justified and whether support is still needed.
This is the most common case. The duty rests on both parents — one may fulfill it mainly through personal care, the other through monetary payments. The court considers each parent’s real contribution to care and their financial capacity.
In practice it matters whether care is alternating and which parent bears most daily costs. Personal care is often treated as a contribution to maintenance.
With alternating custody, courts may reduce the amount if costs are shared evenly, but large income differences can still justify ongoing payments.
Personal care often includes not only time, but also organizing the child’s daily life (school, doctors, activities). This affects how the monetary part of support is allocated.
For disputes about custody or parenting plans, see: Custody and parental rights vs. child support.
If the situation is urgent, a party can request interim support for the duration of proceedings: Interim child support before judgment. This is often crucial when the child needs stable funds early in the case.
In divorce cases, child support is often decided in the divorce judgment. See: Divorce and child support.
There is no fixed “support table.” The amount is assessed individually based on two main criteria.
The court examines real, justified needs, including:
Needs depend on the child’s age and situation. Costs of rehabilitation, treatment, tutoring or development activities can be justified when they reflect real needs and the family’s standard of living.
It helps to briefly explain why specific costs are necessary, which makes the cost breakdown more credible.
The court looks at whether the expenses are reasonable and necessary in the circumstances, not whether they seem “luxury” in everyday terms. It helps to explain why specific costs are needed.
The court considers current income and earning potential, including:
If a parent does not work but could, the court may use hypothetical income. This is a common area of dispute.
Where income is disputed, bank statements, asset information and other evidence of actual living standards can help the court assess real capacity.
In practice courts may examine business income, rent or civil contracts, as well as the obligor’s actual standard of living. A fuller financial picture reduces arguments about “hidden” income.
The court also considers the other parent’s care contribution, other support obligations and special needs. Travel and contact costs may also matter.
For a deeper explanation of criteria, see: Child support amounts: criteria and rules.
That guide also includes cost breakdown examples and practical notes on evidence preparation.
This section also covers special cases, for example support for an adult child, a child with disability, or situations where a parent has limited income. The core principles remain the same, but evidence and arguments are usually more detailed.
Turning 18 does not automatically end support. If the child continues education and cannot support themselves, the obligation may continue. For a child with disability, the court looks at increased treatment and care costs.
Questions also arise about back child support and arrears. Courts can award support for a past period if it is shown that the child’s needs were not met. See: Back child support and arrears.
In atypical cases, evidence matters even more: school certificates, medical records, therapy invoices and treatment costs. The better documented the needs, the easier it is to justify the amount requested.
For disability‑related cases, it is useful to add official decisions and documentation from support institutions, along with summaries of recurring care costs.
It is also worth listing irregular but significant expenses (camps, equipment, rehabilitation) and spreading them across months in the cost sheet.
If the child’s situation is urgent, it may be possible to request interim support or accelerated procedures. See: Interim child support before judgment and Immediate child support.
The Child support calculator provides an indicative amount based on net income and number of children. It is a helpful tool for preparation, but it does not replace the court’s decision.
The calculator result may differ from a judgment when:
If support is not paid, enforcement tools and the support fund may apply: Non‑payment of child support — enforcement and bailiff and Alimony fund — when it applies. If circumstances change, you can seek a modification: Increase of child support — when and how or Reduction or termination of child support.
The calculator can also be a starting point for mediation or settlement, but discussions should rely on a concrete cost breakdown and evidence of expenses. This reduces disputes about “real” costs.
In more complex cases, a short written summary with key figures and documents can make legal consultations and claim preparation much easier.
For a fuller explanation of criteria and amounts, see: Child support amounts: criteria and rules.
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