Magento 2 – how to show including & excluding tax price on product option?

Step 1: First you need to add di.xml in the following path:

app/code/Magemonkey/PriceAdjustment/etc/frontend

Now add the below code:

<?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\Tax\Observer\UpdateProductOptionsObserver" type="Magemonkey\PriceAdjustment\Observer\UpdateProductOptionsObserver" />
</config>

<?xml version="1.0"?>

</config>

Step 2: Next, you need to add module.xml file in the following path:

app/code/Magemonkey/PriceAdjustment/etc

Add the below code:

<?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="Magemonkey_PriceAdjustment" setup_version="1.0.0">
        <sequence>
            <module name="Magento_Tax"/>
        </sequence>
    </module>
</config>

<?xml version="1.0"?>

</sequence>

</module>

</config>

Step 3: Now you need to add registration.php file in the following path:

app/code/Magemonkey/PriceAdjustment

Add the below code:

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

<?php

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

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

'Magemonkey_PriceAdjustment',

__DIR__

);

Step 4: Lastly, you need to add the UpdateProductOptionsObserver.php file in the following path:

app/code/Magemonkey/PriceAdjustment/Observer

And add the below code:

<?php
namespace Magemonkey\PriceAdjustment\Observer;

use Magento\Framework\Event\ObserverInterface;

class UpdateProductOptionsObserver extends \Magento\Tax\Observer\UpdateProductOptionsObserver
{
    /**
     * Tax data
     *
     * @var \Magento\Tax\Helper\Data
     */
    protected $taxData;

    /**
     * @var \Magento\Framework\Registry
     */
    protected $registry;

    /**
     * @param \Magento\Tax\Helper\Data $taxData
     * @param \Magento\Framework\Registry $registry
     */
    public function __construct(
        \Magento\Tax\Helper\Data $taxData,
        \Magento\Framework\Registry $registry
    ) {
        $this->taxData = $taxData;
        $this->registry = $registry;
    }

    /**
     * Change default JavaScript templates for options rendering
     *
     * @param \Magento\Framework\Event\Observer $observer
     * @return $this
     */
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $response = $observer->getEvent()->getResponseObject();
        $options = $response->getAdditionalOptions();

        $_product = $this->registry->registry('current_product');
        if (!$_product) {
            return $this;
        }

        $algorithm = $this->taxData->getCalculationAlgorithm();
        $options['calculationAlgorithm'] = $algorithm;
        // prepare correct template for options render
        if ($this->taxData->displayBothPrices()) {
            $options['optionTemplate'] = sprintf(
                '<%%= data.label %%>'
                . '<%% if (data.finalPrice.value) { %%>'
                . ' +<%%= data.basePrice.formatted %%> (%1$s <%%= data.finalPrice.formatted %%>)'
                . '<%% } %%>',
                __('Incl. tax:')
            );
        } elseif ($this->taxData->priceIncludesTax() && $this->taxData->displayPriceExcludingTax()) {
            $options['optionTemplate'] = sprintf(
                '<%%= data.label %%>'
                . '<%% if (data.basePrice.value) { %%>'
                . ' +<%%= data.basePrice.formatted %%>'
                . '<%% } %%>'
            );
        }

        $response->setAdditionalOptions($options);
        return $this;
    }
}

<?php

namespace Magemonkey\PriceAdjustment\Observer;

use Magento\Framework\Event\ObserverInterface;

class UpdateProductOptionsObserver extends \Magento\Tax\Observer\UpdateProductOptionsObserver

{

/**

* Tax data

* @var \Magento\Tax\Helper\Data

protected $taxData;

/**

* @var \Magento\Framework\Registry

protected $registry;

/**

* @param \Magento\Tax\Helper\Data $taxData

* @param \Magento\Framework\Registry $registry

public function __construct(

\Magento\Tax\Helper\Data $taxData,

\Magento\Framework\Registry $registry

) {

$this->taxData = $taxData;

$this->registry = $registry;

}

/**

* Change default JavaScript templates for options rendering

* @param \Magento\Framework\Event\Observer $observer

* @return $this

public function execute(\Magento\Framework\Event\Observer $observer)

{

$response = $observer->getEvent()->getResponseObject();

$options = $response->getAdditionalOptions();

$_product = $this->registry->registry('current_product');

if (!$_product) {

return $this;

}

$algorithm = $this->taxData->getCalculationAlgorithm();

$options['calculationAlgorithm'] = $algorithm;

// prepare correct template for options render

if ($this->taxData->displayBothPrices()) {

$options['optionTemplate'] = sprintf(

'<%%= data.label %%>'

. '<%% if (data.finalPrice.value) { %%>'

. ' +<%%= data.basePrice.formatted %%> (%1$s <%%= data.finalPrice.formatted %%>)'

. '<%% } %%>',

__('Incl. tax:')

);

} elseif ($this->taxData->priceIncludesTax() && $this->taxData->displayPriceExcludingTax()) {

$options['optionTemplate'] = sprintf(

'<%%= data.label %%>'

. '<%% if (data.basePrice.value) { %%>'

. ' +<%%= data.basePrice.formatted %%>'

. '<%% } %%>'

);

}

$response->setAdditionalOptions($options);

return $this;

}

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