or that purpose.)</p>
    <p>The function aims to produce the personal income tax payable for the inputs given
in the tax year <code>fy.year</code>. The function is specified to produce the most accurate 
calculation of personal income tax given the variables in the ATO's 2% sample files.
 However, many components are absent from these files, while other components could
 not be computed reliably.</p> 
<p>For the 2018-19 tax year, the function calculates</p><dl class='dl-horizontal'>
<dt>tax on ordinary tax