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OpenFisca

COLLECTIVE
Open source
rules as code
law
python
Fiscal Host:

The most widely adopted free and open-source engine to write rules as code

This is OpenFisca's pageOpenFisca
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Become a financial contributor.

Financial Contributions

Custom contribution
Donation

Support OpenFisca with no voting rights, or as an addition to a membership. Thank you! 🙇

Starts at
€1 EUR

Latest activity by

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Membership
Individuals [colleges A, D and E]

For individuals to get voting rights at the Foundation. Indexed on mean daily income in country of activity. Please calculate your contribution by ... Read more

Starts at
€0.50 EUR / year

Latest activity by

+ 13
Membership
Service providers [college C]

For legal entities selling OpenFisca implementation or support services. Yearly contribution is 3% of gross revenue from OpenFisca-related activity... Read more

Starts at
€50 EUR

Latest activity by

Membership
Legal entities users [college B]

For legal entities that use OpenFisca. Yearly contribution is indexed on national GNI per capita. Please calculate your contribution by finding yo... Read more

Starts at
€240 EUR / year

Latest activity by

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Top financial contributors

Individuals

1
Salsa Digital

€3,306 EUR since Jan 2025

2
Sandra Chakroun

€45 EUR since Dec 2023

3
Emmanuel Raviart

€45 EUR since Jan 2025

4
Mahdi Ben Jelloul

€45 EUR since Jan 2025

5
Hamish Fraser

€45 EUR since Jan 2025

6
Nadia Webster

€45 EUR since Jan 2025

7
Taka

€45 EUR since Jan 2025

8
Maxime BOLLENGIER

€45 EUR since Jan 2025

9
maukoquiroga

€45 EUR since Jan 2025

10
Thomas Guillet

€30 EUR since Jan 2025

11
Matti Schneider

€30 EUR since Jan 2025

12
Dorine Lambinet

€30 EUR since Jan 2025

13
Benoît-cty

€30 EUR since Jan 2025

14
Pia

€30 EUR since Jan 2025

15
Lallemand Chloé

€30 EUR since Jan 2025

Organizations

1
The Tides Foundation

€4,593.73 EUR since Apr 2024

2
Codeur·euses en Liberté

€1,000 EUR since Jan 2025

3
Verb

€550 EUR since Jan 2025

OpenFisca is all of us

Our contributors 22

Thank you for supporting OpenFisca.

Sandra Chakroun

Admin

€45 EUR

Matti Schneider

Admin

The Tides Fou...

€4,594 EUR

Salsa Digital

Service providers [college C]

€3,306 EUR

Codeur·euses ...

Service providers [college C]

€1,000 EUR

Verb

Service providers [college C]

€550 EUR

Emmanuel Raviart

Individuals [colleges A, D ...

€45 EUR

Mahdi Ben Jel...

Individuals [colleges A, D ...

€45 EUR

Hamish Fraser

Individuals [colleges A, D ...

€45 EUR

Nadia Webster

Individuals [colleges A, D ...

€45 EUR

Taka

Individuals [colleges A, D ...

€45 EUR

Maxime BOLLEN...

Individuals [colleges A, D ...

€45 EUR

Budget

Transparent and open finances.

View all transactions →
Monthly financial contribution to OpenFisca (Service prov...

Credit from Verb to OpenFisca •

+€550.00EUR
Completed
Contribution #825123
Yearly financial contribution to OpenFisca (Individuals [...

Credit from maukoquiroga to OpenFisca •

+€45.00EUR
Completed
Contribution #824993
Yearly financial contribution to OpenFisca (Individuals [...

Credit from Paul Dutronc-Postel to OpenFisca •

+€30.00EUR
Completed
Contribution #824857
€
Today’s balance

€9,017.68 EUR

Total raised

€9,017.68 EUR

Total disbursed

--.-- EUR

Estimated annual budget

€16,129.73 EUR

About

The most widely adopted free and open-source engine to write rules as code

Government departments, lawmakers and civil society finally share a common language to debate and activate social and fiscal policies: OpenFisca enables collaboratively modelling laws and regulations and making them computable over open APIs for developers, datascientists and researchers.

Policy experts and governments

OpenFisca enables institutions to efficiently share regulation updates and to pool IT costs. Interconnecting rules across public bodies in the form of legible parameters and executable code provides algorithmic transparency and reduces the bill for the taxpayer.

Developers and datascientists

OpenFisca enables developers to easily deliver apps calculating complex taxes and benefits through its JSON web API, and datascientists to compute large-scale through its vectorial Python API. Contributing formulas and coding extensions enables building services for any business.

Economists and researchers

OpenFisca enables economists and researchers to use survey and administrative data to simulate the impact of any past or future reform on the income distribution of a given population. Linking all computed taxes and benefits enables analysing how multiple reforms interact.

International recognition

  • OpenFisca is recommended by the OECD to enable “better policy outcomes and enhanced service delivery”.
  • Received the Edge of Government Innovation Award 2023 at the World Government Summit
  • Received the Most Innovative Open-Source Software Award 2019 by the European Commission
  • Recognised as a Digital Public Good by the United Nations Development Programme (UNDP), UNICEF and Norad.

Learn all about OpenFisca on openfisca.org!

Our team

Sandra Chakroun

Admin

Matti Schneider

Admin