diff --git a/src/Helpers/helpers.php b/src/Helpers/helpers.php
index a833c222..17e8d140 100644
--- a/src/Helpers/helpers.php
+++ b/src/Helpers/helpers.php
@@ -6,7 +6,7 @@
 use Money\Money;
 use Money\Parser\DecimalMoneyParser;
 
-if (! function_exists('object_to_array_recursive')) {
+if (!function_exists('object_to_array_recursive')) {
     /**
      * Recursively cast an object into an array.
      *
@@ -23,7 +23,7 @@ function object_to_array_recursive($object)
     }
 }
 
-if (! function_exists('money')) {
+if (!function_exists('money')) {
     /**
      * Create a Money object from a Mollie Amount array.
      *
@@ -37,7 +37,7 @@ function money($value, string $currency)
     }
 }
 
-if (! function_exists('decimal_to_money')) {
+if (!function_exists('decimal_to_money')) {
     /**
      * Create a Money object from a decimal string / currency pair.
      *
@@ -53,7 +53,7 @@ function decimal_to_money(string $value, string $currency)
     }
 }
 
-if (! function_exists('mollie_array_to_money')) {
+if (!function_exists('mollie_array_to_money')) {
     /**
      * Create a Money object from a Mollie Amount array.
      *
@@ -66,7 +66,7 @@ function mollie_array_to_money(array $array)
     }
 }
 
-if (! function_exists('money_to_mollie_array')) {
+if (!function_exists('money_to_mollie_array')) {
     /**
      * Create a Mollie Amount array from a Money object.
      *
@@ -84,7 +84,7 @@ function money_to_mollie_array(Money $money)
     }
 }
 
-if (! function_exists('mollie_object_to_money')) {
+if (!function_exists('mollie_object_to_money')) {
     /**
      * Create a Money object from a Mollie Amount object.
      *
@@ -97,7 +97,7 @@ function mollie_object_to_money(object $object)
     }
 }
 
-if (! function_exists('money_to_decimal')) {
+if (!function_exists('money_to_decimal')) {
 
     /**
      * Format the money as basic decimal
diff --git a/src/Subscription.php b/src/Subscription.php
index 5397b43a..cb279b73 100644
--- a/src/Subscription.php
+++ b/src/Subscription.php
@@ -613,20 +613,22 @@ public function getCurrencyAttribute()
     }
 
     /**
-     * Gets the amount to be refunded for the subscription's unused time.
+     * Gets the amount to be reimbursed for the subscription's unused time.
+     *
+     * Result range value: (-X up to 0)
      *
      * @param  \Carbon\Carbon|null  $now
      * @return \Money\Money
      */
-    public function getReimburseAmountForUnusedTime(?Carbon $now = null): ?Money
+    public function getReimbursableAmountForUnusedTime(?Carbon $now = null): Money
     {
         $now = $now ?: now();
 
         if ($this->onTrial()) {
-            return null;
+            return $this->zero();
         }
         if (round($this->getCycleLeftAttribute($now), 5) == 0) {
-            return null;
+            return $this->zero();
         }
 
         return $this->reimbursableAmount()
@@ -792,12 +794,10 @@ protected function reimburse(Money $amount, array $overrides = [])
      */
     protected function reimbursableAmount()
     {
-        $zeroAmount = new Money('0.00', new Currency($this->currency));
-
         // Determine base amount eligible to reimburse
         $latestProcessedOrderItem = $this->latestProcessedOrderItem();
         if (!$latestProcessedOrderItem) {
-            return $zeroAmount;
+            return $this->zero();
         }
 
         $reimbursableAmount = $latestProcessedOrderItem->getTotal()
@@ -831,7 +831,7 @@ protected function reimbursableAmount()
 
         // Guard against a negative value
         if ($reimbursableAmount->isNegative()) {
-            return $zeroAmount;
+            return $this->zero();
         }
 
         return $reimbursableAmount;
@@ -971,4 +971,9 @@ public function latestProcessedOrderItem()
     {
         return $this->orderItems()->processed()->orderByDesc('process_at')->first();
     }
+
+    private function zero(): Money
+    {
+        return new Money('0.00', new Currency($this->currency));
+    }
 }
diff --git a/tests/SubscriptionTest.php b/tests/SubscriptionTest.php
index c1691c25..add5c51b 100644
--- a/tests/SubscriptionTest.php
+++ b/tests/SubscriptionTest.php
@@ -8,7 +8,6 @@
 use Laravel\Cashier\Cashier;
 use Laravel\Cashier\Events\SubscriptionResumed;
 use Laravel\Cashier\Subscription;
-use Laravel\Cashier\Tests\Database\Factories\OrderFactory;
 use Laravel\Cashier\Tests\Database\Factories\OrderItemFactory;
 use Laravel\Cashier\Tests\Database\Factories\SubscriptionFactory;
 use Laravel\Cashier\Tests\Fixtures\User;
@@ -592,7 +591,7 @@ public function canQueryRecurringSubscriptions()
     }
 
     /** @test */
-    public function halfWayThroughSubscriptionReturnsPositiveReimburesmentAmount()
+    public function halfwayThroughSubscriptionReturnsPositiveReimbursementAmount()
     {
         $this->withConfiguredPlans();
 
@@ -611,7 +610,7 @@ public function halfWayThroughSubscriptionReturnsPositiveReimburesmentAmount()
 
         $this->assertEquals(
             money('-50', 'EUR'),
-            $subscriptionHalfWayThrough->getReimburseAmountForUnusedTime()
+            $subscriptionHalfWayThrough->getReimbursableAmountForUnusedTime()
         );
     }
 
@@ -634,8 +633,8 @@ public function nonReimbursableSubscriptionReturnsNoReimbursementAmount()
             ]);
 
         $this->assertEquals(
-            null,
-            $nonReimbursable->getReimburseAmountForUnusedTime()
+            money(0, 'EUR'),
+            $nonReimbursable->getReimbursableAmountForUnusedTime()
         );
     }
 }