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Welcome to the Open Tax Society

Free, open and collaborative tax technologies

Buiding the technological future of tax with open-source code and data, ethical AI, and a lot of collaboration!
Join The Open Tax Society

Our Initiatives

The Open Tax Initiatives are open-source tools and frameworks to support professionals, academics, tax administrations, and civic technologists.

Open Tax calendar

A structured global repository of tax obligations & deadlines.

Open Tax Systems

Algorithmic, rule-based representations of tax regimes.

Open Tax Data

A centralized dataset of public tax disclosures from MNEs (ETRs, CbCR, etc.)

Open TP Benchmarks

Transfer pricing comparables shared by practitioners.

Open Tax AI

A free chatbot trained on public data to support research and understanding.

View all initiatives

Make tax systems more accessible, computable, and collaborative.

Learn more

The Open Tax Society is a nonprofit association dedicated to transforming global tax knowledge into open, structured, and computable public infrastructure.

Its approach is rooted in the belief that tax systems should be transparent, intelligible, and reusable.

TaxTech deserves Open-source standards

Free

Because tax knowledge should not be behind a paywall and because tax systems need to be better structured

Transparent

Because tax professionals deserve to know how data are treated and transformed. No to black boxes!

Automation ready

Because tax knowledge needs to be usable in automated financial processes to empower tax professionals.

Collaborative

Because all tax professionals possess a piece of the incredibly complex puzzle of tax systems! We all need to contribute.

TP modeling tools
Integrated Tax Calendars

Enabling the digitalization of tax use cases

From automated tax calendars to profound tax modelling, tax technologies require shared knowledge.

Hero contributors

“I truly believe that technology can help make tax systems both easier and safer for taxpayers and also more efficient from the point of view of governments and tax administrations.”
Walid Eljaafari
CEO of Algonomia
“As a young tax professional I believe that we can collaborate to build share knowledge repositories, instead of falling into the usual trap of relying on external knowledge and data providers.”
Virginie Cheng
Tax apprentice at Cerba Healthcare
“Open source is the gold standard and as an engineer and lead developer at Algonomia, coding Tax software for almost a decade, I am certain that it can improve how tax knowledge is built and shared.”
Youssef Balma
Lead developer at Algonomia
“AI represents the next frontier in terms of technology, and it is our role as data-scientists to ensure that its use contributes to the improvement of Tax systems.”
Zhengxiao Ying
data-scientist at Algonomia

Trusted By

Multinational Enterprises, Tax adivsory firms and academics who contribute to or use the various Initiatives (and accept to be referenced)

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Our News and events

The Open Tax Society produces content, training materials, webinars and takes part in various events! Stay informed.

See our news and events