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. You can also check our TAX related Extensions : VAT Exemption (Relief) for Magento 2 Tax Exempt for Magento 2 Partial Tax Exempt For Woocommerce Vat Exempt (Relief) Plugin For Woocommerce Related Posts : Magento 2 Tax Guide for US Sellers A Complete Guide For VAT Relief / TAX Exemption Different Tax Rates with Different Magento View Magento 2 : With Tax or Without Tax Working Flow Magento 2 Tax Guide for EU Sellers Magento 2 : How Tax Apply After Discount Magento 2 Tax Exempt by Tax ClassId Tax Exemption Guide USA Tax Setting in Magento 2 Tax Case Rounding Issues and Solution for Magento Jul 23rd, 2019|