Product::getTaxValueSum

public function getTaxValueSum()
{
	$value = 0;

	if($this->data['TAX_RATE'] > 0)
	{
		if($this->data['TAX_INCLUDED'] === 'Y')
		{
			$value = $this->round($this->getRawValue('PRICE_RAW_SUM') - $this->getRawValue('PRICE_RAW_SUM') / (1 + $this->data['TAX_RATE']/100));
		}
		else
		{
			$value = $this->round($this->getRawValue('PRICE_SUM') - $this->getRawValue('PRICE_EXCLUSIVE_SUM'));
		}
	}

	return $value;
}