Updating an Italian maintenance allowance with Istat indices

Enter the allowance set by the court and the month of the order: the tool brings it to the month you choose with Istat’s FOI index.

Italian court orders and separation agreements that set a maintenance allowance for a child or a spouse (assegno di mantenimento) commonly provide that it is adjusted to Istat indices. That means the FOI index excluding tobacco, the series Istat publishes for revaluing money, applied in full, not at the 75% some leases use. The starting point is the month of the order, or the month the order itself names, and the adjustment is usually made once a year, on the anniversary. The calculation is the allowance × target month index / starting month index, with the linking coefficient 1.214 if the period crosses the January 2026 change of base. An allowance of €600 a month set in March 2022, brought to September 2026, becomes €691.20: coefficient 1.152, 15.2%. For parents living abroad and paying or receiving in euros, the same rule applies; if the order names another index, frequency or amount, the order prevails.

Allowance updated to September 2026

€477.45

coefficient 1.061 · +6.1%

€450.00

FOI index September 2023119.3 (base 2015)
FOI index September 2026104.3 (base 2025)
Base-linking coefficients1.214
Increase€27.45
New allowance€477.45
Assumptions

Istat method: ratio of the FOI indices excluding tobacco for the two months, times the base-linking coefficients (1.373 · 1.071 · 1.214), coefficient rounded to three decimals. Method and sources

Checked by Radif Partners · Editorial policy · Method and sources

A €600 allowance, year by year

FOI excluding tobacco (Istat); 2015 to 2025 base link 1.214.
Adjustment inCoefficient from March 2022ChangeAllowance due
March 20231.0747.4%€644.40
March 20241.0868.6%€651.60
March 20251.10510.5%€663.00
March 20261.12112.1%€672.60

Each row starts again from the original allowance and the month of the order, not from the previous year’s figure, so rounding does not build up. The result matches, within a few cents, an allowance updated every year with the twelve-month change.

Check the order first

  • The starting month: usually the month of the order, sometimes a different date it sets.
  • The frequency: annual is the norm; another frequency changes the target month.
  • The index: unless the order says otherwise, the FOI excluding tobacco, see Istat Rivaluta.
  • Extraordinary expenses: not indexed with the allowance; they are shared as the order provides.

The method is set out in the Istat revaluation. For the French equivalent, see child support indexation in France. This page explains a calculation, not your rights in a specific case.

Frequently asked questions

Does the receiving parent have to ask for the Istat adjustment each year?

It depends on the order. Where it provides for automatic adjustment to Istat indices, the updated amount is due without a new court decision, but it is sensible to send the paying parent the calculation and the months used, in writing. If the order says nothing about indexation, check with a lawyer before claiming a different amount.

Can past years of missed adjustments be claimed?

The tool lets you rebuild them: for each year, bring the allowance from the month of the order to that year’s anniversary month and compare it with what was paid. Whether, and how far back, the differences can still be claimed is a legal question that involves limitation periods; an Italian family lawyer should assess it.

I pay from abroad in another currency: which amount is indexed?

The euro amount set in the order. The Istat adjustment is calculated in euros, and the currency conversion of each payment is a separate matter, governed by the order or by how payments have been made. Enter the euro allowance in the tool; it does not handle exchange rates.

Related pages and calculations

Monetary revaluation (Italy)

Revalue an Italian debt, damages award or price from the month it was due to today with the Istat coefficient.

Istat revaluation (Italy)

Revalue an amount between two months with Italy’s FOI index, using Istat’s base-linking coefficients and official rounding.

Child support indexation

How a French child support or maintenance payment is uprated each year with the consumer price index excluding tobacco.

Official sources

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Official indices checked in 2026, site checked on