Who lets you check the model
| Institution | Public code | What is there |
|---|---|---|
| Congressional Budget Office | 33 public repositories | Tax, premium-growth, legal-status, budgetary-feedback and other models in Python, Stata and R. |
| Policy Simulation Library | 44 public repositories | Tax-Calculator, OG-Core, OG-USA, Cost-of-Capital-Calculator. |
| The Budget Lab at Yale | 29 public repositories | Tax-Simulator, Tariff-Model, tariff-rate-tracker (MIT license), and a versioned archive of chart specifications. |
| Tax Foundation | 69 public repositories — but not the model | Datasets, publication data and interactives are public. We found no repository containing the Taxes and Growth macroeconomic model, which is the thing in dispute in Exhibit 2. |
| Joint Committee on Taxation | Documentation only | Publishes methodology overviews (The Joint Committee on Taxation Revenue Estimating Process, February 2019) and states its model weights in its analysis of the 2017 tax law (JCX-69-17). No public code located. |
| Heritage, CEI, CIS, Groundwork | None located | No public model or code repository of their own found. |
Source. GitHub organization pages inspected directly, September 2026; repository counts as of October 5, 2026; Joint Committee on Taxation, The Joint Committee on Taxation Revenue Estimating Process, February 2019, and JCX-69-17, December 22, 2017.
Method and data
Method. “None located” is not “none exists.” This records what a determined search found in September 2026, and any institution listed here can point to a repository we missed. Repository counts include everything in the organization, not only models — which is why the Tax Foundation row is the interesting one: a high count, and not the model. A table rather than a bar chart because the counts are not comparable quantities and the caveat cannot be drawn.
Download CSV. Data and chart licensed CC BY 4.0.
Higgins Strategy. “Who lets you check the model” Exhibit 5, The Same Question, Different Numbers (Study III). October 12, 2026. https://higginsstrategy.com/charts/e3-5-public-models/