Club Drupal

  $actions['commerce_tax_remove_taxes'] = array(

    'label' => t('Remove taxes applied to a line item'),

    'parameter' => array(

      'commerce_line_item' => array(

        'type' => 'commerce_line_item',

        'label' => t('Line item'),

        'wrapped' => TRUE,

        'save' => TRUE,

        'restriction' => 'selector',

      ),

      'increase_base_price' => array(

        'type' => 'boolean',

        'label' => t('Increase the base price amount by the amount of display inclusive taxes removed.'),

        'description' => t('If left unchecked, a price of £2.95 including £0.49 VAT will be reduced to £2.46. If checked it will be set to £2.95 with no tax included.'),

        'default value' => FALSE,

        'restriction' => 'input',

      ),

      'tax_rates' => array(

        'type' => 'list<text>',

        'label' => t('Limit removal to only a certain set of tax rates'),

        'description' => t('If no tax rates are selected, all tax rates will be removed from the line item. Use ctrl + click (or command + click) to deselect a tax rate.'),

        'options list' => 'commerce_tax_rate_titles',

        'optional' => TRUE,

        'restriction' => 'input',

      ),

    ),

    'group' => t('Commerce Tax'),

  );

/**

 * Rules actions: removes all taxes applied to a line item.

 */

function commerce_tax_remove_taxes($line_item_wrapper, $increase_base_price, $tax_rates) {

  // Load all the tax component types to look for matching price components in

  // the line item's unit price. Filter the list by tax rates that should be

  // removed if only some were specified.

  $component_types = commerce_tax_commerce_price_component_type_info();

  if (!empty($tax_rates)) {

    foreach ($component_types as $name => $component_type) {

      if (!in_array($component_type['tax_rate'], $tax_rates)) {

        unset($component_types[$name]);

      }

    }

  }

  // Loop over the price components in the line item's unit price.

  $price = $line_item_wrapper->commerce_unit_price->value();

  $new_components = array();

  foreach ($price['data']['components'] as $key => $component) {

    // Look for components that match one of the defined tax price components.

    if (in_array($component['name'], array_keys($component_types))) {

      // Remove it from the components array.

      unset($price['data']['components'][$key]);

      // If the component was marked as "included" in the price amount, update

      // the price amount to reflect the difference.

      if (!empty($component['included'])) {

        $price['amount'] -= $component['price']['amount'];

        // If the user opted to increase the base price by the amount of the

        // display inclusive taxes removed, add them back as new price components.

        if (!empty($increase_base_price)) {

          $price['data']['components'][] = array(

            'name' => 'base_price',

            'price' => array(

              'amount' => $component['price']['amount'],

              'currency_code' => $component['price']['currency_code'],

              'data' => array(),

            ),

            'included' => TRUE,

          );

          $price['amount'] += $component['price']['amount'];

        }

      }

    }

  }

  $line_item_wrapper->commerce_unit_price = $price;

}