diff --git a/src/Calculation/DefaultCalculator.php b/src/Calculation/DefaultCalculator.php
new file mode 100644
index 0000000..e554fb5
--- /dev/null
+++ b/src/Calculation/DefaultCalculator.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Gloudemans\Shoppingcart\Calculation;
+
+use Gloudemans\Shoppingcart\CartItem;
+
+class DefaultCalculator {
+    static function getAttribute(string $attribute, CartItem $cartItem) {
+        $decimals = config('cart.format.decimals', 2);
+        
+        switch ($attribute) {
+            case 'discount':
+                return $cartItem->price * ($cartItem->getDiscountRate() / 100);
+            case 'tax':
+                return round($cartItem->priceTarget * ($cartItem->taxRate / 100), $decimals);
+            case 'priceTax':
+                return round($cartItem->priceTarget + $cartItem->tax, $decimals);
+            case 'discountTotal':
+                return round($cartItem->discount * $cartItem->qty, $decimals);
+            case 'priceTotal':
+                return round($cartItem->price * $cartItem->qty, $decimals);
+            case 'subtotal':
+                return max(round($cartItem->priceTotal - $cartItem->discountTotal, $decimals), 0);
+            case 'priceTarget':
+                return round(($cartItem->priceTotal - $cartItem->discountTotal) / $cartItem->qty, $decimals);
+            case 'taxTotal':
+                return round($cartItem->subtotal * ($cartItem->taxRate / 100), $decimals);
+            case 'total':
+                return round($cartItem->subtotal + $cartItem->taxTotal, $decimals);
+            default:
+                return;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Calculation/GrossPrice.php b/src/Calculation/GrossPrice.php
new file mode 100644
index 0000000..d622e12
--- /dev/null
+++ b/src/Calculation/GrossPrice.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Gloudemans\Shoppingcart\Calculation;
+
+use Gloudemans\Shoppingcart\CartItem;
+
+class GrossPrice {
+    static function getAttribute(string $attribute, CartItem $cartItem) {
+        $decimals = config('cart.format.decimals', 2);
+        
+        switch ($attribute) {
+            case 'priceNet':
+                return round($cartItem->price / (1 + ($cartItem->taxRate / 100)), $decimals);
+            case 'discount':
+                return $cartItem->priceNet * ($cartItem->getDiscountRate() / 100);
+            case 'tax':
+                return round($cartItem->priceTarget * ($cartItem->taxRate / 100), $decimals);
+            case 'priceTax':
+                return round($cartItem->priceTarget + $cartItem->tax, $decimals);
+            case 'discountTotal':
+                return round($cartItem->discount * $cartItem->qty, $decimals);
+            case 'priceTotal':
+                return round($cartItem->priceNet * $cartItem->qty, $decimals);
+            case 'subtotal':
+                return max(round($cartItem->priceTotal - $cartItem->discountTotal, $decimals), 0);
+            case 'priceTarget':
+                return round(($cartItem->priceTotal - $cartItem->discountTotal) / $cartItem->qty, $decimals);
+            case 'taxTotal':
+                return round($cartItem->subtotal * ($cartItem->taxRate / 100), $decimals);
+            case 'total':
+                return round($cartItem->subtotal + $cartItem->taxTotal, $decimals);
+            default:
+                return;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/CartItem.php b/src/CartItem.php
index 675371b..b73d203 100644
--- a/src/CartItem.php
+++ b/src/CartItem.php
@@ -2,6 +2,7 @@
 
 namespace Gloudemans\Shoppingcart;
 
+use Gloudemans\Shoppingcart\Calculation\DefaultCalculator;
 use Gloudemans\Shoppingcart\Contracts\Buyable;
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Contracts\Support\Jsonable;
@@ -89,7 +90,7 @@ class CartItem implements Arrayable, Jsonable
      *
      * @var float
      */
-    private $discountRate = 0;
+    private float $discountRate = 0;
 
     /**
      * CartItem constructor.
@@ -396,56 +397,8 @@ class CartItem implements Arrayable, Jsonable
             case 'weightTotal':
                 return round($this->weight * $this->qty, $decimals);
         }
-
-        if (config('cart.gross_price')) {
-            switch ($attribute) {
-                case 'priceNet':
-                    return round($this->price / (1 + ($this->taxRate / 100)), $decimals);
-                case 'discount':
-                    return $this->priceNet * ($this->discountRate / 100);
-                case 'tax':
-                    return round($this->priceTarget * ($this->taxRate / 100), $decimals);
-                case 'priceTax':
-                    return round($this->priceTarget + $this->tax, $decimals);
-                case 'discountTotal':
-                    return round($this->discount * $this->qty, $decimals);
-                case 'priceTotal':
-                    return round($this->priceNet * $this->qty, $decimals);
-                case 'subtotal':
-                    return max(round($this->priceTotal - $this->discountTotal, $decimals), 0);
-                case 'priceTarget':
-                    return round(($this->priceTotal - $this->discountTotal) / $this->qty, $decimals);
-                case 'taxTotal':
-                    return round($this->subtotal * ($this->taxRate / 100), $decimals);
-                case 'total':
-                    return round($this->subtotal + $this->taxTotal, $decimals);
-                default:
-                    return;
-            }
-        } else {
-            switch ($attribute) {
-                case 'discount':
-                    return $this->price * ($this->discountRate / 100);
-                case 'tax':
-                    return round($this->priceTarget * ($this->taxRate / 100), $decimals);
-                case 'priceTax':
-                    return round($this->priceTarget + $this->tax, $decimals);
-                case 'discountTotal':
-                    return round($this->discount * $this->qty, $decimals);
-                case 'priceTotal':
-                    return round($this->price * $this->qty, $decimals);
-                case 'subtotal':
-                    return max(round($this->priceTotal - $this->discountTotal, $decimals), 0);
-                case 'priceTarget':
-                    return round(($this->priceTotal - $this->discountTotal) / $this->qty, $decimals);
-                case 'taxTotal':
-                    return round($this->subtotal * ($this->taxRate / 100), $decimals);
-                case 'total':
-                    return round($this->subtotal + $this->taxTotal, $decimals);
-                default:
-                    return;
-            }
-        }
+        
+        return call_user_func(config('cart.calculator', DefaultCalculator::class) . '::getAttribute', $attribute, $this);
     }
 
     /**
@@ -564,4 +517,15 @@ class CartItem implements Arrayable, Jsonable
 
         return number_format($value, $decimals, $decimalPoint, $thousandSeperator);
     }
-}
+
+    /**
+     * Getter for the raw internal discount rate.
+     * Should be used in calculators.
+     *
+     * @return float
+     */
+    public function getDiscountRate()
+    {
+        return $this->discountRate;
+    }
+}
\ No newline at end of file
diff --git a/src/Config/cart.php b/src/Config/cart.php
index 739265e..42f667a 100644
--- a/src/Config/cart.php
+++ b/src/Config/cart.php
@@ -12,7 +12,7 @@ return [
     |
     */
 
-    'gross_price' => false,
+    'calculator' => \Gloudemans\Shoppingcart\Calculation\DefaultCalculator::class,
 
     /*
     |--------------------------------------------------------------------------
diff --git a/tests/CartTest.php b/tests/CartTest.php
index 09e3526..0e45315 100644
--- a/tests/CartTest.php
+++ b/tests/CartTest.php
@@ -3,6 +3,7 @@
 namespace Gloudemans\Tests\Shoppingcart;
 
 use Carbon\Carbon;
+use Gloudemans\Shoppingcart\Calculation\GrossPrice;
 use Gloudemans\Shoppingcart\Cart;
 use Gloudemans\Shoppingcart\CartItem;
 use Gloudemans\Shoppingcart\ShoppingcartServiceProvider;
@@ -1378,7 +1379,7 @@ class CartTest extends TestCase
     public function it_use_gross_price_as_base_price()
     {
         $cart = $this->getCartDiscount(0);
-        config(['cart.gross_price' => true]);
+        config(['cart.calculator' => GrossPrice::class]);
 
         $cartItem = $cart->add(new BuyableProduct(1, 'First item', 100), 2);
 
@@ -1392,7 +1393,7 @@ class CartTest extends TestCase
     public function it_use_gross_price_and_it_use_correctly_rounded_values_for_totals_and_cart_summary()
     {
         $this->setConfigFormat(2, ',', '');
-        config(['cart.gross_price' => true]);
+        config(['cart.calculator' => GrossPrice::class]);
 
         $cart = $this->getCartDiscount(6);