In Magento 2 Add Additional Tax Amount In Cart

We can achieve it through the event and Observer, where will use event sales_quote_address_collect_totals_after. Need to create a custom module and configure an event. Let’s say our module is Osc_Tax. Example of events code (app\code\Osc\Tax\etc\events.xml)

Example of Observer code (app\code\Osc\Tax\Observer\Customtax.php)

<?php namespace Osc\Tax\Observer;use \Magento\Framework\Event\ObserverInterface;use \Magento\Framework\Event\Observer;class Customtax implements ObserverInterface
{public $additionalTax = 4;public function execute(Observer $observer){
$getTotal = $observer->getData('total');   
if (count($getTotal->getAppliedTaxes()) > 0) {
            $getTotal->addTotalAmount('tax', $this->additionalTax);   
}
return $this;}}




In this Example code, $additionalTax variable have additional tax amount.






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