How is the «Apply Customer Tax» («Before Discount» / «After Discount») option handled?

dmitrii_fediuk · February 2, 2017, 4:59pm

magento/magento2/blob/2.1.3/app/code/Magento/Tax/etc/adminhtml/system.xml#L54-L58


<field id="apply_after_discount" translate="label comment" type="select" sortOrder="40" showInDefault="1" showInWebsite="1" showInStore="0" canRestore="1">
    <label>Apply Customer Tax</label>
    <source_model>Magento\Tax\Model\System\Config\Source\Apply</source_model>
    <backend_model>Magento\Tax\Model\Config\Notification</backend_model>
</field>

github.com

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


$this->_options = [
    ['value' => 0, 'label' => __('Before Discount')],
    ['value' => 1, 'label' => __('After Discount')],
];

github.com

magento/magento2/blob/2.1.3/app/code/Magento/Tax/Model/Config.php#L40-L40


const CONFIG_XML_PATH_APPLY_AFTER_DISCOUNT = 'tax/calculation/apply_after_discount';

github.com

magento/magento2/blob/2.1.3/app/code/Magento/Tax/Model/Config.php#L180-L193


/**
 * Check what taxes should be applied after discount
 *
 * @param   null|string|bool|int|Store $store
 * @return  bool
 */
public function applyTaxAfterDiscount($store = null)
{
    return (bool)$this->_scopeConfig->getValue(
        self::CONFIG_XML_PATH_APPLY_AFTER_DISCOUNT,
        \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
        $store
    );
}

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

dmitrii_fediuk · February 2, 2017, 5:03pm