Write rules as code

OpenFisca is an open source platform to write rules as code. Describe your tax and benefit system, provide a situation as input (i.e income), ask for a calculation as output (i.e. income tax), and get your results.

• For economists: OpenFisca allows you to use survey data to simulate the impact of a reform on a given government’s budget and on a population’s standard of living.
• For developers: OpenFisca allows you to easily create web applications based on your simulation results, thanks to the web API. You can build a great variety of other services by coding formulas, hosting your own instance or building your own extensions.
• For public administrations: OpenFisca allows you to stop building your micro-simulation software and tax & benefit calculators on your own. Instead, contribute to OpenFisca, collaborate with other administrations and reduce the bill for the taxpayer.