History
=======

Many people have contributed to Tax-Calculator and we hope the number of contributors will continue to grow.

## Origins of Tax-Calculator

Tax-Calculator is a descendant of [TAXCALC](https://www.nber.org/taxcalc/) and [Internet TAXSIM version 9](https://users.nber.org/~taxsim/taxsim9/), programs written by Dan Feenberg and Inna Shapiro, and hosted at [NBER](https://users.nber.org/). The code translation into Python concluded with the first addition to the Tax-Calculator GitHub source-code repository on July 29, 2014.

## Subsequent contributors to Tax-Calculator

The Tax-Calculator repository contains a [contributor list](https://github.com/PSLmodels/Tax-Calculator/graphs/contributors) containing everyone who has developed code that has been committed to the repository since the first commit on July 29, 2014.