diff --git a/app/Models/Depreciable.php b/app/Models/Depreciable.php
index e22fb65a7..250894820 100644
--- a/app/Models/Depreciable.php
+++ b/app/Models/Depreciable.php
@@ -69,14 +69,14 @@ class Depreciable extends SnipeModel
     public function getLinearDepreciatedValue() // TODO - for testing it might be nice to have an optional $relative_to param here, defaulted to 'now'
     {
         if ($this->purchase_date) {
-            $months_passed = $this->purchase_date->diff(now())->m;
+            $months_passed = ($this->purchase_date->diff(now())->m)+($this->purchase_date->diff(now())->y*12);
         } else {
             return null;
         }
 
         if ($months_passed >= $this->get_depreciation()->months){
             //if there is a floor use it
-            if($this->get_depreciation()->deprecation_min->isNotEmpty()) {
+            if(!$this->get_depreciation()->depreciation_min == null) {
 
                 $current_value = $this->get_depreciation()->depreciation_min;