I believe the actual IRS tax code implementation is in a separate repo here: https://github.com/IRS-Public/direct-file while the originally linked repo is the fact graph tooling decoupled from the tax implementation.
Look like many of them are specifically the xml files here:
https://github.com/IRS-Public/direct-file/tree/e0d5c84451cc5...
I was just reading through those! A bit dizzying
specifically here https://github.com/IRS-Public/direct-file/tree/main/direct-f...
From https://github.com/IRS-Public/fact-graph/blob/main/docs/fact...:
> Standardize Fact Dictionaries as a canonical format for declaratively modeling tax logic
Re:IRS Open Sources its Fact Graph
by MangoToupe on Wednesday October 15, 2025 @09:44PM
(#45600594)
As far as I am aware, fact just means shared assumption. This seems entirely reasonable for a tax code.
Re:IRS Open Sources its Fact Graph
by classified on Thursday October 16, 2025 @06:43AM
(#45603798)
It looks like just an HTTP interface to a database, not the actual data.
It’s pretty cool to see the way that the IRS handles defining and maintaining its tax calculations, but also a machine-readable tax code seems cool too.