Code to change incl_tax text in Total and Subtotal to incl_GST - By WebToffee

function.php

<?php //Do not add this line of code
add_filter('wf_pklist_alter_tax_inclusive_text','wf_pklist_remove_tax_text',10,3);
function wf_pklist_remove_tax_text($incl_tax_text, $template_type, $order)
{
	if($template_type=='invoice')
	{
		$incl_tax_text='Incl. GST';
	}
	return $incl_tax_text;
}