Post-tax-and-transfer Gini Coefficient Calculation
- Assoc Prof Jamus Jerome Lim asked whether the post-tax-and-transfer Gini coefficient uses a general formula or is applied uniquely per household, and whether the data for post-tax/transfer income comes from actual tax/CPF statements or assumptions about taxes/transfers by income decile.
- Chan Chun Sing explained that the Gini coefficient is computed from household surveys conducted by the Ministry of Manpower and the Department of Statistics, with adjustments for taxes and transfers.
- The calculation uses individual-level data where available from agencies like IRAS and CPFB, but estimates taxes and transfers at the household level when individual data is unavailable, such as using the Household Expenditure Survey for GST estimates based on household characteristics.