I have a question about adjusters: I am working on a shop which has two tax zones (Switzerland and EU) and two tax rates (8% and 19%). The tax should always be included in the item price. From my understanding that is not possible for both tax zones at the same time. So I am having my eye on the adjusters.

I would use an adjuster to do the following: The client facing cart on the front end gets no adjustments. Only after the shipping address has been confirmed I would apply either one or the other adjustment (8% or 19% included) conditionally via the plugin to the order.

Does that make sense? Is that possible and if so is this even the best way to go or am I missing something which is more awesome?

If the answer is yes then I would invest more time and just dig into it.

Thanks in advance!

2 Answers 2


Answer is yes, you could use an adjuster to try and make the price "even" while in the cart.


I put together an example adjuster that checks for a shipping address in Switzerland or the EU, and then applies the 8% or 19% adjustment to the order's item subtotal. It does not include shipping in the tax amount.

You would still need to register this via a plugin, see this thread for an example.


    namespace Commerce\Adjusters;

    use Craft\Commerce_OrderAdjustmentModel;
    use Craft\Commerce_OrderModel;

    class MyAdjuster implements Commerce_AdjusterInterface {

      public function adjust(Commerce_OrderModel &$order, array $lineItems = []){

        $euCountries = array(
        'AT', 'BE', 'HR', 'BG', 'CY', 'CZ', 'DK', 'EE', 'FI', 'FR', 'DE', 'GR', 'HU', 'IE',
        'IT', 'LV', 'LT', 'LU', 'MT', 'NL', 'PL', 'PT', 'RO', 'SK', 'SI', 'ES', 'SE', 'GB'

        if($order->shippingMethodHandle !== NULL && sizeof($order->lineItems) > 0)

          $countryCode = $order->shippingAddress->getCountry()->iso;

          if(in_array($countryCode, $euCountries))
            // Country is in EU
            $salesTax = $order->itemSubtotal * 0.19;
          else if ( $countryCode == "CH" )
            // Country is Switzerland
            $salesTax = $order->itemSubtotal * 0.08;
            return [];

          $order->baseTax = $order->baseTax + $salesTax;

          $taxAdjuster = new Commerce_OrderAdjustmentModel();

          $taxAdjuster->type = "Tax";
          $taxAdjuster->name = "Sales Tax";
          $taxAdjuster->description = "Adds "+$salesTax+" of tax to the order";
          $taxAdjuster->amount = +$salesTax;
          $taxAdjuster->orderId = $order->id;
          // If your Adjuster affects lineItems rather than the total, you record the ids here
          $taxAdjuster->optionsJson = [ 'lineItemsAffected' => null ];
          $taxAdjuster->included = false;

          return [$taxAdjuster];
        } else {
          return [];

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