OpenFisca

What it does

A free engine for writing rules as code: legislation is modelled as code to calculate taxes and benefits through a JSON web API, run analysis with a vectorial Python API and simulate the impact of reforms on income distribution. A Python framework with open country packages, for policy experts and governments, developers and data scientists, and researchers. The page does not state the licence.

Where it fits on the map

• Company tax department › Direct & International Tax › Corporate income-tax compliancepartly covered
• Company tax department › Tax Policy & Stakeholder Engagement › Tax policy & stakeholder engagementpartly covered
• Tax authority › Policy, Legislation & Revenue Analysis › Reform costing & microsimulationcovered
• Tax authority › Policy, Legislation & Revenue Analysis › Rules as code & legislative draftingcovered

  Named as a project to start with: Catala writes the statute article by article next to the law; OpenFisca serves a country's rules as an API. Pick by how close to the legal text you must stay.

In the processes

• Corporate income tax returnStep 2 · Tax adjustments & return calculation

Similar projects

Of the same kind, for a shared jurisdiction or tax area. Not a ranking.

• CatalaProgramming language for writing law as code, next to the legal text it implements.
• DGFiP calculette-irThe M-language rules of the DGFiP engine that computes French income tax and the real-estate wealth tax (IFI).
• EUROMODThe EU tax-benefit microsimulation model, maintained by the Joint Research Centre.
• GETTSIMThe German Taxes and Transfers Simulator: a microsimulation model of German taxes and benefits.
• IRS Fact GraphKnowledge-graph rules engine that models the US Internal Revenue Code, the calculation core of Direct File.
• IRS Form BuilderScala library that turns flow XML, fact dictionaries and locale files into questionnaire sites on Fact Graph.

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