ProjectionLab currently supports some country-specific stuff like pension and savings plans. Since maintaining an accurate and up-to-date database of the various plans and regulations in each country is not scalable for a single-dev project, I suggest creating a github repo with a folder for each country, and then letting the community add country-specific stuff in some simple yaml/json format. Each country can have it’s own maintainer that verifies the data is correct and up to date. You’d then be able to source this data back into the app.