“Rules as code”: coding the legislation for the benefit of citizens & rule-makers – with OpenFisca!
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This document discusses OpenFisca, an open-source tax-benefit modeling framework, and LexImpact, a tool built on OpenFisca that allows lawmakers to estimate the impact of proposed tax reforms. OpenFisca uses "rules as code" to code legislation computationally and run simulations on individual-level data. LexImpact addresses the problem that lawmakers often do not know the full impacts of proposals until after voting by allowing them to simulate proposals using anonymized survey data transformed into the OpenFisca format. It works by identifying relevant survey data, transforming it into anonymized OpenFisca data, and then using OpenFisca to quickly simulate the impacts of parametric tax reforms before voting.
“Rules as code”: coding the legislation for the benefit of citizens & rule-makers – with OpenFisca!
- 2. “Rules as code”: coding the legislation for the benefit of citizens & rule-makers – with OpenFisca!
- 3. WHO ARE WE
- 7. A modular mass micro-simulation framework
- 8. • Formulas • Conditions • Decisions, decisions, decisions... Rules 8 Example: The amount of income tax. Tax-benefit legislation are...
- 9. • An individual • Or a group of individuals Example: family, tax household, company... People 9 Applied on...
- 11. WHAT IS #RAC?
- 12. Typical mass micro-simulation framework
- 13. If you don’t have access to the exact dataset, you can’t use it
- 14. What if we wanted to use this data instead?
- 17. Separate data from rules => #RaC
- 18. 18
- 19. WHAT CAN WE DO WITH OPENFISCA / #RAC?
- 20. LexImpact Evaluate the impact of the Budget Bill ● Partnership with Parliament ● Evaluate the impact of the Budget Bill ● Propose amendments 20 LexImpact
- 21. “Today, Parliament has few means of evaluating amendments and proposals before passing a law.” Problem
- 22. “The impacts on the population and revenues are therefore too often discovered during debates...” Problem
- 23. “...or even once the law has been voted and implemented.” Problem
- 24. “Help our parliamentarians to estimate the impact of their amendments before voting!” Value Proposition
- 25. “LexImpact, an interface that allows you to quickly simulate the impact of parametric income tax reforms.” Solution
- 26. 26 Open LexImpact – Hypothetical Cases
- 27. 27 LexImpact Pop – Tax-Benefit Data
- 30. Step #1: Identify the survey data
- 31. ● Merge individuals & menages to create social households ● Transform social households into tax households ● Recreate necessary income data ○ Extrapolations sometimes needed ● Export to OpenFisca data Step #2: Transform survey data into OpenFisca data
- 32. Objective ● The model must be as precise as possible ● Without jeopardizing fiscal secrecy Step #3: Anonymization
- 33. ● Important concept in France, thus a custom anonymisation was necessary to access data: ○ Removing non essential data ○ Aggregating in household that represent >10 real households ○ Adding noise in recognizable data (salaries) ○ Using buckets (e.g. replacing date of birth by range of age that is sufficient for income tax) Step #3: Anonymization
- 34. 34 Step #4: Rock n’ roll
- 35. 35 Step #4: Rock n’ roll
- 36. QUESTIONS
- 37. THANKS FOR LISTENING ! contact@beta.gouv.fr contact@openfisca.org contact@leximpact.an.fr