What is the IDACI?
The income deprivation affecting children index (IDACI) measures the proportion of all children aged 0 to 15 living in income-deprived families in different local areas called lower-layer super output areas (LSOAs) across England. Each LSOA usually has between 1,000 and 3,000 residents or 400 to 1,200 households.
Each LSOA gets an IDACI score of between 0 and 1. For example, a score of 0.38 would mean that 38% of children aged 0 to 15 live in income-deprived families in that area.
LSOAs are then ranked according to their levels of deprivation relative to that of other areas, with 1 being the most deprived.
The IDACI is a subset of the index of multiple deprivation (IMD)
The IMD and IDACI were most recently published in 2025. However, funding calculations for 2025-26 and 2026-27 are based on