The Treasury releases a number of the spreadsheet-based or R programming language modelling tools it uses to inform its economic and fiscal forecasts and its research and policy work.
Most of these modelling tools are updated two or three times a year to coincide with the release of the Treasury's latest forecasts in economic and fiscal updates.
Models and tools in R
These models are built in the R programming language and have web-based working applications (apps) that the public can use.
- Distribution Explorer - Allows users to explore the income distribution of households, families and individuals in New Zealand, using outputs created by the Treasury's Tax and Welfare Analysis (TAWA) model.
- Income Explorer - Allows users to explore the relationship between gross income and net income due to New Zealand's tax and welfare policies.
Spreadsheet models in MS Excel format
- Fiscal Strategy Model (FSM) - Projects the financial performance and the financial position of the government over a medium-term horizon.
- New Zealand Superannuation (NZS) Fund Contribution Rate Model - Calculates the government’s capital contributions to, and in future years withdrawals from, the New Zealand Superannuation Fund (NZSF).
- Long-Term Fiscal Model (LTFM) - Projects economic and fiscal variables such as nominal GDP and core Crown net debt that are used in the statements on the long-term fiscal position published by the Treasury every four years. The latest version is the Long-term Fiscal Model for He Tirohanga Mokopuna 2021.
- Aggregate Personal Income Tax Revenue Estimate Tool - Estimates the change in tax revenue when you modify the personal income tax system. Last updated in September 2022.