This code is used to change the "incl. tax" text to "incl. VAT" in invoice document - By WebToffee

functions.php

<?php //Do not add this line of code
//To remove incl_tax text from subtotal
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. VAT';
	}
	return $incl_tax_text;
}