Magento Tax Rate Based on Shipping Destination

Question

How can I change tax rates, when changing the shipping destination while checkout?

I didn't find settings for that in the backend (correct my if I'm wrong) so I think I have to solve that with an own module.

Where do I start with that project?

Example-Goal:

• German Shop (19% VAT)
• Swiss Client (Export from Germany to non-EU country: 0% VAT)
• Shipping to border Germany-Switzerland to save shipping costs => I have to calculate with 19% VAT because the product is not (yet) leaving the country, even the customer is in Switzerland and gets still 0% VAT from Magento)

Any ideas, which classes and methods have to be changed for that?

Thanks in advance.

Answer 1

I solved my task.

I override the Mage_Tax_Model_Calculation method getRateRequest. Here I can add my own logic before the switch statement which used $basedOn to assign the $address.

    //override basedOn
    $basedOn = 'billing';
    if ($shippingAddress != null && $billingAddress != null) {
        if ($shippingAddress->getData('country_id') != $billingAddress->getData('country_id') && $shippingAddress->getData('country_id') == 'DE') {
            $basedOn = 'shipping';
        }
    }
    // needed to still work if one of both addresses is null
    if ($shippingAddress == null || $billingAddress == null) {
        $basedOn = 'default';
    }
    else  {
        $ship = $shippingAddress->getData('country_id');
        $bill = $billingAddress->getData('country_id');
        if(empty($ship) || empty($bill))  {
            $basedOn = 'default';
        }
    }