compute

A function which returns the tax amount for the requested tax, passing all parameter information in a single call.

Syntax

value = compute ( $taxname, $earnings, $ytdearnings, $filingstatus, $exemptions, $stateexemptions, $payperiods, $paydate, $misc, $aux, $ytdtax )

• value - A float result.
• $taxname - A string naming the specific tax from the table to be computed.
• $earnings - Gross earnings for the current pay period.
• $ytdearnings - Year-to-date earnings prior to the current pay period.
• $filingstatus - Numeric value representing the employee's filing status for this tax. (see filingstatus)
• $exemptions - Total from Form W-4 Step 3, line 3.
• $stateexemptions - State exemptions claimed by the employee.
• $payperiods - Number representing the total number of pay periods in a year.
• $paydate - A Date object representing the check date. Default is current date.
• $misc - A numeric value required by some formulas. When this field is required, the tax object will have specific instructions in the $miscellaneous_instructions field. (see tax)
• $aux - A numeric value required by some formulas. When this field is required, the tax object will have specific instructions in the $auxiliary_instructions field. (see tax)
• $ytdtax - Year-to-date tax amount withheld for this tax prior to the current period.

Examples

Ohio state tax for a married employee:

<?php
include 'taxes.php';
// take the default for most parameters:
$amt = compute('OH',            // tax name
                2000,           // gross earnings
                0,              // ytd earnings
                $filingMarried);// filing status
print $amt;
?>

Federal is a litte more complicated, because it need most of the parameters. This example assumes the employee has signed a 2020 or later W-4:

<?php
include 'taxes.php';
$amt = compute('Federal Income Tax',
                2000,          // earnings this period
                6000,          // ytd earnings
                $filingMarried,
                2500,          // exemptions=W-4 total credits
                0,             // state exemptions. use -1 for
                               // nonresident alien
                24,            // bi-monthly
                0,             // paydate (take default)
                1000,          // misc = step 4(a) - 4(b)
                1,             // aux = step 2(b), multiple jobs
                1130.01        // ytd tax withheld
                );
print $amt;
?>

For employees who haven’t signed a 2020 or later W-4, use the following:

<?php
include 'taxes.php';
$amt = compute('FIT',
                2000,          // earnings this period
                6000,          // ytd earnings
                $filingMarried,
                4,             // exemptions=W-4 exemptions
                0,             // state exemptions not used
                24,            // bi-monthly
                0,             // paydate (take default)
                0,             // misc for supplemental ytdearnings
                0,             // aux for resident alien
                1130.01        // ytd tax withheld
                );
print $amt;
?>