Estimating your CAF rights for child-related benefits is not just about entering an income into a simulator. Several parameters interact: household composition, income brackets, age of the children, chosen childcare method. The result varies significantly from one family to another, even with identical incomes. This guide details the variables that actually impact the estimated amount and the input errors that distort the simulation.
Family allowances and family supplement: amounts according to income brackets
Family allowances are paid from the moment there are two dependent children under 20 years old. Their amount depends on the household’s annual income, divided into three brackets. The family supplement, on the other hand, is aimed at families with at least three children aged 3 to 21 years.
| Benefit | Income bracket | Main condition |
|---|---|---|
| Family allowances – full rate | Income below the first ceiling | At least 2 dependent children |
| Family allowances – reduced rate (divided by 2) | Income between the 1st and 2nd ceilings | At least 2 dependent children |
| Family allowances – minimum rate (divided by 4) | Income above the 2nd ceiling | At least 2 dependent children |
| Family supplement (full or increased rate) | Under income ceiling | 3 children aged 3 to 21 years |
Income ceilings vary each year and are raised on April 1st. A household that exceeds a ceiling by a few euros moves into the next bracket, which can halve the amount. The simulation allows you to check which bracket the household falls into before taking any steps.
To delve deeper into the calculation of CAF rights for children, it is essential to accurately identify the income taken into account: these are the resources from N-2 (2024 income for an estimate in 2026), and not the current monthly salary.
CMG after the September 2025 reform: what the simulation does not always show
The free choice of childcare supplement has been thoroughly restructured. Since September 2025, the minimal out-of-pocket expense of 15% has been eliminated. The amount of aid now adjusts according to the household’s income, the number of children, and the actual hours of care used.
This change has a concrete effect on the simulation. Before the reform, two families with similar incomes received a similar CMG. The new scale introduces finer granularity, making prior estimation even more useful.
CMG and single-parent families: extension up to 12 years
Since September 1, 2025, single-parent families receive the CMG until the child is 12 years old, compared to 6 years previously. A solo parent who thought they no longer qualified for this aid after their child’s entry into primary school needs to restart a simulation.
Shared custody and dual rights to CMG
Since December 1, 2025, each parent in equitable shared custody can open a separate right to CMG. During the simulation, each parent must therefore estimate their rights individually, providing their own household situation and resources.
This dual opening of rights does not spontaneously appear in all simulators. Sometimes, it is necessary to perform two separate simulations, one for each parent, to obtain a complete estimate.
Back-to-school allowance: ceilings and automatic payment
The back-to-school allowance (ARS) is paid each year in mid-August to families whose resources are below a ceiling set according to the number of children. The amount varies according to the child’s age and can reach 466 euros per child for the oldest ones.
Three age brackets determine the amount:
- Children aged 6 to 10 years: lowest amount of the three brackets
- Children aged 11 to 14 years: intermediate amount
- Children aged 15 to 18 years: highest amount, which can go up to 466 euros
Payment is automatic for children aged 6 to 15 years already known to the CAF. However, for young people aged 16 to 18 years, a declaration of schooling or apprenticeship is necessary. Without this step, the ARS is not paid, even if the household meets the income conditions.
Common errors that distort the estimation of CAF rights
The reliability of a simulation depends on the quality of the information entered. Several errors frequently occur and produce results that are misaligned with actual rights.
- Confusing net income and taxable income: the CAF considers the net categorized income before deductions, as it appears on the tax notice, not the net monthly salary
- Forgetting to declare a child in shared custody: each parent must report the situation for the sharing of rights to be taken into account
- Failing to update a change in family situation (separation, birth, move): the CAF calculates based on the last known declaration, which can block or reduce a benefit
- Using current year income instead of that from N-2: the resources taken into account are those declared two years before the payment period
The official simulator on caf.fr remains the most reliable tool to cross-check all these parameters. It covers family allowances, CMG, ARS, housing assistance, and activity bonus in a single simulation.
A discrepancy of a few euros in declared income can shift a household from one bracket to another, significantly altering the amount received. Checking your tax notice before starting the simulation remains the most cost-effective action for obtaining an accurate estimate.
