Federal Individual Income Tax Microsimulation Model
Python Tcl Other
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README.md

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Tax-Calculator

Tax-Calculator simulates the US federal individual income tax system. In conjunction with micro data that represent the US population and a set of behavioral assumptions, Tax-Calculator can be used to conduct revenue scoring and distributional analyses of tax policies. Tax-Calculator is written in Python, an interpreted language that can execute on Windows, Mac, or Linux.

Disclaimer

Results will change as the underlying models improve. A fundamental reason for adopting open source methods in this project is so that people from all backgrounds can contribute to the models that our society uses to assess economic policy; when community-contributed improvements are incorporated, the model will produce different results.

Getting Started

There are two common ways to get started with Tax-Calculator:

The first way is to install the Tax-Calculator repository on your computer. Do this by following the instructions in our Contributor Guide. After the installation you can read the source code and either use Tax-Calculator as is or develop new Tax-Calculator capabilities.

When using Tax-Calculator on your computer you will have to supply your own input data on tax filing units because the repository does not include a representative sample of tax filing units. However, you can use it to estimate tax liabilities and marginal tax rates for any collection of filing units specified in Internet-TAXSIM input format using the simtax.py command-line interface to Tax-Calculator. And you can also process your own CSV-formatted data using the inctax.py command-line interface to Tax-Calculator, but when doing this be sure to read the data-preparation guidelines.

When developing new Tax-Calculator capabilities be sure to read about our coding style and testing procedures after you have read completely the Contributor Guide.

The second way is to access Tax-Calculator through our web application, TaxBrain. This way allows you to generate aggregate and distributional tax reform estimates using a nationally representative sample of tax filing units that is not part of the Tax-Calculator repository.

And, of course, you can get started with Tax-Calculator both ways.