Uprating a French child support payment

Enter the current monthly amount, the index month in force at the ruling and the latest index month: the tool applies the ratio.

A child support or maintenance payment set by a French court or agreement (pension alimentaire) is normally indexed on consumer prices and must be uprated every year by the parent who pays, without waiting to be asked and without a new hearing. Unless the ruling says otherwise, the new amount is the current amount multiplied by the last index published on the uprating date and divided by the last index published on the date of the ruling. The default index is Insee’s consumer price index excluding tobacco for all households (base 2025). For an uprating on 1 January 2026, the last index published was that of November 2025: 99.87. The latest month now available is September 2026 at 103.07, published on 16 October 2026. The uprating date is the one in the ruling, often 1 January, 1 July or the anniversary of the judgment. Where the Caf manages the payment through financial intermediation, it applies the uprating itself.

Indexed payment

€412.32

+€12.32 · +3.08%

€400.00

CPI excluding tobacco September 2026103.07
CPI excluding tobacco September 202599.99
Change3.08%
Assumptions

Consumer price index, all households, France, excluding tobacco (base 2025, Insee series 011814056). If the ruling names another index, use its values. Method and sources

Checked by Radif Partners · Editorial policy · Method and sources

Example: a ruling of March 2023, uprated on 1 January 2026

A judgment of 1 March 2023 set the payment at €350 a month. On that day the last index in the Journal officiel was January 2023 (95.03). On 1 January 2026 it was November 2025 (99.87). The uprated amount is 350 × 99.87 / 95.03 = €367.83 a month. Select those two months in the calculator to reproduce it.

Latest monthly index values

Source: Insee, CPI excluding tobacco, all households, series 011814056.
MonthIndex (base 2025)Journal officiel
September 2026103.0716 October 2026
August 2026103.3517 September 2026
July 2026102.6715 August 2026
June 2026102.0912 July 2026
May 2026102.3714 June 2026
April 2026102.2416 May 2026

Insee extended the base 2025 series backwards, so a ruling from 2010 or 2015 can be uprated with it directly; the calculator goes back to 1996. The series is on Insee series 011814056, the rules of the uprating on Service-public.fr, annual uprating of child support (F2010), and the choice of index months on Insee, revising child support (Réviser une pension alimentaire).

When the ruling is unclear

If the ruling lacks an element of the formula, the official guidance points to a request for interpretation to the family judge (juge aux affaires familiales) of the court that ruled. The calculator does not replace that step. For a rent rather than a payment, see rent increases in 2026; for the Italian equivalent, maintenance indexation in Italy.

Frequently asked questions

The other parent never uprated the payment: how far back can I claim?

The official guidance says arrears from missed uprating can be claimed for the last five years, under the general limitation rule of article 2224 of the Civil Code. Each year’s arrears are the difference between what was paid and what should have been paid. A commissaire de justice can recover them if the paying parent refuses.

The ruling names the urban blue- and white-collar index: does that change the result?

Yes, slightly. That is a different Insee series, and if the ruling names it you must use its values for both months. This calculator uses the all-households series excluding tobacco, the default one; for another series, take its two values from Insee and apply the same ratio, or ask the family court to interpret an unclear ruling.

Should the uprated amount be rounded to the euro?

Only if the ruling or agreement asks for it. Otherwise keep the amount to the cent, as the calculator does. Some rulings ask for rounding to the nearest euro or the euro above; follow their wording exactly, since that is what a court would apply in a dispute about the amount due.

Related pages and calculations

Rent increase 2026

What a landlord in France may ask for in 2026, by when, from what date, and what to put in the request.

Maintenance allowance update (Italy)

An Italian maintenance allowance brought up to date with Istat indices from the month of the court order.

France: annual rent review

How a French residential rent is reviewed once a year with the IRL, and the cases where no increase is allowed.

Official sources

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Official indices checked in 2026, site checked on