Recent developments of the SimPaths dynamic microsimulation framework

SimPaths is an open-source framework for modelling individual and household life course events, jointly developed at the Centre for Microsimulation and Policy Analysis and the University of Glasgow (Bronka et al., 2025). The framework is designed to project life histories through time, building up a detailed picture of career paths, family (inter)relations, health, and financial circumstances. The modular nature of the SimPaths framework is designed to facilitate analysis of alternative assumptions concerning the tax and benefit system, sensitivity to parameter estimates and alternative approaches for projecting labour/leisure and consumption/savings decisions. SimPaths builds upon standardised assumptions and data sources, which facilitates adaptation to alternative countries.

The presentation will focus on recent developments of the SimPaths framework, centred around: • Introduction of new health and well-being variables (MCS, PCS, life satisfaction) for the UK model • Development of a new wealth module for the UK model • Updated release for the model for Italy • First release for the models for Poland, Spain, Germany, Spain • Development of macro modules (all countries) • Development of migration modules (all countries) • Development of inter-household transfer modules (all countries) • Improved model documentation

Strategies for internal validation will also be discussed.