Apply Free shipping Cart rule on subtotal after discount in Magento 2

If you want to apply cart price rules like free shipping after discount and tax calculation, then you need to do customization in the sales rule module.

To add new option in the cart price rule condition drop-down, You need to create custom extension like “Magemonkeys_Cartrule”.

1. Create registration.php in app/code/Magemonkeys/Cartrule/

<?php 
\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Magemonkeys_Cartrule',
    __DIR__
);

<?php

\Magento\Framework\Component\ComponentRegistrar::register(

\Magento\Framework\Component\ComponentRegistrar::MODULE,

'Magemonkeys_Cartrule',

__DIR__

);

2. Create module.xml in app/code/Magemonkeys/Cartrule/etc/

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd">
    <module name="Magemonkeys_Cartrule" setup_version="1.0.0">
    </module>
</config>

<?xml version="1.0"?>

</module>

</config>

3. Create di.xml in app/code/Magemonkeys/Cartrule/etc/adminhtml/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">    
    <preference for="Magento\SalesRule\Model\Rule\Condition\Address" type="Magemonkeys\Cartrule\Model\Rule\Condition\Address" />
</config>

<?xml version="1.0"?>

</config>

4. Create Address.php in app/code/Magemonkeys/Cartrule/Model/Rule/Condition/Address.php

<?php

namespace Magemonkeys\Cartrule\Model\Rule\Condition;

/**
 * Class Address
 */
class Address extends \Magento\SalesRule\Model\Rule\Condition\Address
{
    
    /**
     * Load attribute options
     * @return $this
     */
    public function loadAttributeOptions()
    {
        $attributes = [
            'base_subtotal_with_discount' => __('Subtotal (Excl. Tax)'),
            'base_subtotal' => __('Subtotal'),
            'total_qty' => __('Total Items Quantity'),
            'weight' => __('Total Weight'),
            'shipping_method' => __('Shipping Method'),
            'postcode' => __('Shipping Postcode'),
            'region' => __('Shipping Region'),
            'region_id' => __('Shipping State/Province'),
            'country_id' => __('Shipping Country'),
        ];

        $this->setAttributeOption($attributes);

        return $this;
    }

    /**
     * Get input type
     * @return numeric
     */
    public function getInputType()
    {
        switch ($this->getAttribute()) {
            case 'base_subtotal_with_discount':
            case 'base_subtotal':
            case 'weight':
            case 'total_qty':
                return 'numeric';

            case 'shipping_method':
            case 'payment_method':
            case 'country_id':
            case 'region_id':
                return 'select';
        }
        return 'string';
    }

}

<?php

namespace Magemonkeys\Cartrule\Model\Rule\Condition;

/**

* Class Address

class Address extends \Magento\SalesRule\Model\Rule\Condition\Address

{

/**

* Load attribute options

* @return $this

public function loadAttributeOptions()

{

$attributes = [

'base_subtotal_with_discount' => __('Subtotal (Excl. Tax)'),

'base_subtotal' => __('Subtotal'),

'total_qty' => __('Total Items Quantity'),

'weight' => __('Total Weight'),

'shipping_method' => __('Shipping Method'),

'postcode' => __('Shipping Postcode'),

'region' => __('Shipping Region'),

'region_id' => __('Shipping State/Province'),

'country_id' => __('Shipping Country'),

];

$this->setAttributeOption($attributes);

return $this;

}

/**

* Get input type

* @return numeric

public function getInputType()

{

switch ($this->getAttribute()) {

case 'base_subtotal_with_discount':

case 'base_subtotal':

case 'weight':

case 'total_qty':

return 'numeric';

case 'shipping_method':

case 'payment_method':

case 'country_id':

case 'region_id':

return 'select';

}

return 'string';

}

5. Run php bin/magento setup:upgrade command

So you can see the “Subtotal (Excl. Tax)” option in cart price rule’s condition drop-down.

Note: This option has already added by Magento in Magento 2.3.2+ version

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