How is the «Apply Discount On Prices» («Excluding Tax» / «Including Tax») option handled?

dmitry_fedyuk · February 2, 2017, 5:02pm

magento/magento2/blob/2.1.3/app/code/Magento/Tax/etc/adminhtml/system.xml#L59-L64


<field id="discount_tax" translate="label comment" type="select" sortOrder="50" showInDefault="1" showInWebsite="1" showInStore="0" canRestore="1">
    <label>Apply Discount On Prices</label>
    <source_model>Magento\Tax\Model\System\Config\Source\PriceType</source_model>
    <backend_model>Magento\Tax\Model\Config\Notification</backend_model>
    <comment>Apply discount on price including tax is calculated based on store tax if "Apply Tax after Discount" is selected.</comment>
</field>

github.com

magento/magento2/blob/2.1.3/app/code/Magento/Tax/Model/System/Config/Source/PriceType.php#L20-L23


$this->_options = [
    ['value' => 0, 'label' => __('Excluding Tax')],
    ['value' => 1, 'label' => __('Including Tax')],
];

github.com

magento/magento2/blob/2.1.3/app/code/Magento/Tax/Model/Config.php#L42-L42


const CONFIG_XML_PATH_DISCOUNT_TAX = 'tax/calculation/discount_tax';

github.com

magento/magento2/blob/2.1.3/app/code/Magento/Tax/Model/Config.php#L213-L226


/**
 * Get configuration setting "Apply Discount On Prices Including Tax" value
 *
 * @param   null|string|bool|int|Store $store
 * @return  bool
 */
public function discountTax($store = null)
{
    return (int)$this->_scopeConfig->getValue(
        self::CONFIG_XML_PATH_DISCOUNT_TAX,
        \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
        $store
    ) == 1;
}

Details: How is \Magento\Tax\Model\Config::discountTax() implemented and used?

dmitry_fedyuk · February 2, 2017, 5:03pm