Create a free tax coupon in Magento 2 programmatically

In some special cases, you might want to give a free tax for customers, right? I will show you how to create a free tax coupon in Magento 2 programmatically.

If your Magento store doesn’t collect tax, then you don’t have any problem; however, if the store is collecting taxes, you will find a trouble where Magento store doesn’t provide such a way to free tax for a tax-calculated order.

The common solution for this is to use a special coupon to allow free tax for the order.

What we’ll do is to create an observer for the event sales_quote_address_collect_totals_before and apply free tax class for the order items.

This is how to implement it.

The first step is to define an observer in events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_quote_address_collect_totals_before">
        <observer name="vendor_module_free_tax_coupon"
                  instance="Vendor\Module\Observer\FreeTaxCoupon" />
    </event>
</config>

Then we will need to implement the Vendor\Module\Observer\FreeTaxCoupon observer.

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Quote\Model\Quote;

class RemoveOrderTaxFromProduct implements ObserverInterface
{

    public function execute(Observer $observer)
    {
        /** @var Quote $quote */
        $quote = $observer->getEvent()->getQuote();

        $couponCode = $quote->getCouponCode();
        $taxFreeCouponCode = 'FREETAXCOUPON';

        if ($couponCode === $taxFreeCouponCode) {
            /** @var \Magento\Quote\Model\Quote\Item $item */
            foreach ($quote->getAllItems() as $item) {
                $product = $item->getProduct();
                $product->setTaxClassId(0);
            }
        }
    }
}

You can replace the FREETAXCOUPON by the coupon you want.

Also, you can extract the coupon out as a config or maps with a coupon (Marketing section) to make it convenient for store admin to manage.

That’s how you create a free tax coupon in Magento 2 programmatically.

Have fun!