Maintenance CPI calculator
For child and spousal maintenance. First check the index, reference month and adjustment rules in your agreement or court order. This does not calculate Spanish social security pension increases.
Calculation inputs
Result
- Previous payment
- Difference per monthly payment
- Equivalent difference over 12 monthly payments
- Index change or percentage
- Period
- Calculation source
- Calculation date
Indicative comparison: published indices have three decimal places. For an annual adjustment using the published rate, use the first method.
The 12-payment equivalent is not an arrears statement and does not establish a legally payable balance.
How it is calculated
Annual or manual rate: amount × (1 + percentage / 100). Month comparison: amount × ending index / starting index. The final payment is rounded to cents; differences use that rounded result. Annual rates are not added together.
Source: INE national general CPI, base 2025 indices and annual change. Only available final observations are included; unpublished months are not substituted. Optional INE refresh keeps the dated snapshot if the connection fails.
View CPI at INE · Official annual rate series
Amounts are processed in your browser: they are not saved or sent to INE. Refreshing data only requests the two public series.
For the applicable month, multiple adjustments or arrears, check your agreement or seek individual advice.