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<!DOCTYPE html>
<!-- *** NEVER EDIT THIS FILE BY HAND *** -->
<!-- *** INSTEAD EDIT index.htmx FILE *** -->
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link href="docs.css" rel="stylesheet">
<title>Tax-Calculator</title>
</head>
<body>
<h1>Tax-Calculator</h1>
<div class="navbar">
<a href="index.html">Home</a>
<div class="dropdown">
<button class="dropbtn">About</button>
<div class="dropdown-content">
<a href="tc_starting.html">Getting Started</a>
<a href="tc_license.html">Open-Source License</a>
<a href="tc_history.html">Origins & History</a>
<a href="tc_roadmap.html">Future Directions</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn">Documentation</button>
<div class="dropdown-content">
<a href="tc_overview.html">Structural Overview</a>
<a href="uguide.html" target="_blank">User Guide</a>
<a href="cookbook.html" target="_blank">Python Cookbook</a>
<a href="https://github.com/PSLmodels/Tax-Calculator/blob/master/CONTRIBUTING.md#tax-calculator-contributor-guide" target="_blank">Contributor Guide</a>
</div>
</div>
</div>
<h3>What is Tax-Calculator?</h3>
<p>
Tax-Calculator is an open-source microsimulation model for
static analysis of USA federal income and payroll taxes.
</p>
<p>
When using
<a href="https://github.com/PSLmodels/taxdata#about-taxdata-repository"
target="_blank">micro data</a> that represent the USA
population, Tax-Calculator can estimate the aggregate revenue and
distributional effects of tax reforms under static analysis
assumptions.
<p>
Tax-Calculator can also process custom-created data on one or more
filing units permitting analysis of how tax reforms affect certain
people.
</p>
<p>
Tax-Calculator interacts with other models in the
<a href="https://www.pslmodels.org/" target="_blank">
Policy Simulation Library</a> to conduct non-static analysis.
</p>
<p>
Tax-Calculator is transparent because its Python source code and
embedded documentation are publicly available at the
<a href="https://github.com/PSLmodels/Tax-Calculator" target="_blank">
Tax-Calculator GitHub repository</a>.
</p>
<p>
Tax-Calculator can simulate an enormous number of tax reforms
because tax policy is parameterized using over 200 parameters that
can be changed by users <b>without doing any programming</b>.
And even a reform that is not able to be characterized using
currently-available parameters can be simulated by writing
supplementary Python code that characterizes the reform.
</p>
<p>
Tax-Calculator can estimate for each filing unit the marginal tax
rate generated by a small change in income. Marginal tax rates can
be generated for eighteen different kinds of income. And marginal
tax rates can be estimated under any parametric tax reform.
</p>
<p>
Tax-Calculator is extensively tested using hundreds of unit and
integration tests that achieve complete code coverage. Also, there
is an ongoing cross-model validation effort that uses large
randomly-generated samples of filing units to compare results
generated by Tax-Calculator with results from other tax models.
The cross-model validation work with NBER's TAXSIM-27 model is
described <a href="https://github.com/PSLmodels/Tax-Calculator/blob/master/taxcalc/validation/taxsim/README.md#validation-of-tax-calculator-against-internet-taxsim-27"
target="_blank">here</a>.
</p>
<h3>Latest Release</h3>
<p>
<a href="https://github.com/PSLmodels/Tax-Calculator/blob/master/RELEASES.md#2019-06-08-release-230" target="_blank">
2.3.0 (2019-06-08)
</a>
</p>
<p>
If you are already using Tax-Calculator, upgrade using the following
command:
<pre>
conda update -c PSLmodels taxcalc
</pre>
</p>
<p>
If you just getting started, read
<a href="tc_starting.html">these instructions</a>.
</p>
<h3>Disclaimer</h3>
<p>
Results will change as Tax-Calculator data and logic 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.
</p>
<h3>Citing Tax-Calculator</h3>
<p>
Please cite the source of your analysis as <q>Tax-Calculator release
#.#.#, author's calculations</q>. If you wish to provide a link to
Tax-Calculator, the preferred URL is:<br />
<kbd>https://PSLmodels.github.io/Tax-Calculator</kbd><br />
Additionally, we strongly recommend that you describe the input data
used, and provide a link to the materials required to replicate your
analysis or, at least, note that those materials are available upon
request.
</p>
<button onclick="topFunction()" id="topbutton" title="Go to top">Top</button>
<script src="docs.js"></script>
<br /><br />
</body>
</html>