mon-entreprise

Here's that NPM package: https://www.npmjs.com/package/modele-social and https://github.com/betagouv/mon-entreprise This is incredible. I absolutely love the idea of official, government-supported machine readable versions of these kinds of rules.

Another huge French "tax" set is the social contributions, that makes our payrolls quite complex. Computing payrolls is handled by the private sector, contrary to the case of the income tax. But the French administration develops an open source set of online simulators : https://mon-entreprise.fr This is the source code of the underlying "tax" rules : https://github.com/betagouv/mon-entreprise/tree/master/model... Is uses an open source specific language that frames the writing of simple calculation rules, auto-generates an online documentation for non-developers and helps developers build automatic UIs. It is unfortunately not yet translated for English speakers and developers. https://publi.codes

If you read french or want to dive in the mostly english code, you can fork https://github.com/betagouv/mon-entreprise. It doesn't fill tax forms, but it's a set of simulations and a framework to write more models and generate UIs automatically.

Bonne lecture ;) https://github.com/betagouv/mon-entreprise/blob/master/mon-e...

Related : the french administration has built a custom language for another big set of tax rules, those that dictate our social security system (which collects 500 billons of € / year) It's presented on https://publi.codes but unfortunately we've not translated it yet. The language keywords themselves are in french, by design, to bridge the law and its official implementation. It's not yet used to compute taxes, just to simulate them on the official mon-entreprise.fr website. The "code" expressed in YAML is parsed to build the computation model (in TypeScript), to document this model on the Web (each variable has a Web page) and to generate typeform-like forms. It's in the https://github.com/betagouv/mon-entreprise monorepo, but it's also used to implement a model of our personnal climate impact, here : https://github.com/betagouv/ecolab-