diff --git a/app/DataMapper/InvoiceItem.php b/app/DataMapper/InvoiceItem.php
index ccfe5138240e..6349e057ba31 100644
--- a/app/DataMapper/InvoiceItem.php
+++ b/app/DataMapper/InvoiceItem.php
@@ -51,7 +51,7 @@ class InvoiceItem
 
     public $custom_value4 = '';
 
-    public $type_id = 1; //1 = product, 2 = service, 3 unpaid gateway fee, 4 paid gateway fee
+    public $type_id = 1; //1 = product, 2 = service, 3 unpaid gateway fee, 4 paid gateway fee, 5 late fee
 
     public static $casts = [
         'type_id' => 'string',
diff --git a/app/Jobs/Ninja/SendReminders.php b/app/Jobs/Ninja/SendReminders.php
index a10e45075cb4..530795612cd9 100644
--- a/app/Jobs/Ninja/SendReminders.php
+++ b/app/Jobs/Ninja/SendReminders.php
@@ -11,8 +11,13 @@
 
 namespace App\Jobs\Ninja;
 
+use App\DataMapper\InvoiceItem;
+use App\Events\Invoice\InvoiceWasEmailed;
+use App\Jobs\Entity\EmailEntity;
 use App\Libraries\MultiDB;
 use App\Models\Invoice;
+use App\Utils\Ninja;
+use App\Utils\Traits\MakesDates;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Foundation\Bus\Dispatchable;
@@ -21,7 +26,7 @@ use Illuminate\Queue\SerializesModels;
 
 class SendReminders implements ShouldQueue
 {
-    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels, MakesDates;
 
     /**
      * Create a new job instance.
@@ -73,6 +78,7 @@ class SendReminders implements ShouldQueue
         $invoices = Invoice::where('is_deleted', 0)
                            ->where('balance', '>', 0)
                            ->whereDate('next_send_date', '<=', now()->startOfDay())
+                           ->whereNotNull('next_send_date')
                            ->cursor();
 
         //we only need invoices that are payable
@@ -84,29 +90,129 @@ class SendReminders implements ShouldQueue
 
                 $reminder_template = $invoice->calculateTemplate('invoice');
 
-                if($reminder_template == 'reminder1'){
-
-                }
-                elseif($reminder_template == 'reminder2'){
-
-                }
-                elseif($reminder_template == 'reminder3'){
-                    
-                }
-                elseif($reminder_template == 'endless_reminder'){
-
-                }
-
-                //@todo
+                if(in_array($reminder_template, ['reminder1', 'reminder2', 'reminder3', 'endless_reminder']))
+                    $this->sendReminder($invoice, $reminder_template);
 
         });
-        //iterate through all the reminder emails due today
-        //
-        //determine which reminder
-        //
-        //determine late fees
-        //
-        //send
+
+    }
+
+    private function checkSendSetting($invoice, $template)
+    {
+        switch ($template) {
+            case 'reminder1':
+                return $invoice->client->getSetting('enable_reminder1');
+                break;
+            case 'reminder2':
+                return $invoice->client->getSetting('enable_reminder2');
+                break;
+            case 'reminder3':
+                return $invoice->client->getSetting('enable_reminder3');
+                break;
+            case 'endless_reminder':
+                return $invoice->client->getSetting('enable_reminder_endless');
+                break;            
+            default:
+                return false;
+                break;
+        }
+    }
+
+    private function calculateNextSendDate($invoice, $template)
+    {
+        
+    }
+
+    private function sendReminder($invoice, $template)
+    {
+        $invoice = $this->calcLateFee($invoice, $template);
+
+        $invoice->invitations->each(function ($invitation) use($template, $invoice){
+
+            //only send if enable_reminder setting is toggled to yes
+            if($this->checkSendSetting($invoice, $template))
+                EmailEntity::dispatch($invitation, $invitation->company, $template);
+
+        });
+
+            if ($invoice->invitations->count() > 0)
+                event(new InvoiceWasEmailed($invoice->invitations->first(), $invoice->company, Ninja::eventVars()));
+
+            $invoice->last_sent_date = now();
+            $invoice->reminder_last_send = now();
+            $invoice->next_send_date = $this->calculateNextSendDate($invoice, $template);
+
+            if(in_array($template, ['reminder1', 'reminder2', 'reminder3']))
+                $invoice->{$template."_send"} = now();
+
+            //calculate next_send_date
+
+            $invoice->save();
+    }
+
+    private function calcLateFee($invoice, $template) :Invoice
+    {
+        $late_fee_amount = 0;
+        $late_fee_percent = 0;
+
+        switch ($template) {
+            case 'reminder1':
+                $late_fee_amount = $invoice->client->getSetting('late_fee_amount1');
+                $late_fee_percent = $invoice->client->getSetting('late_fee_percent1');
+                break;
+            case 'reminder2':
+                $late_fee_amount = $invoice->client->getSetting('late_fee_amount2');
+                $late_fee_percent = $invoice->client->getSetting('late_fee_percent2');
+                break;
+            case 'reminder3':
+                $late_fee_amount = $invoice->client->getSetting('late_fee_amount3');
+                $late_fee_percent = $invoice->client->getSetting('late_fee_percent3');
+                break;
+            case 'endless_reminder':
+                $late_fee_amount = $invoice->client->getSetting('late_fee_endless_amount');
+                $late_fee_percent = $invoice->client->getSetting('late_fee_endless_percent');
+                break;            
+            default:
+                $late_fee_amount = 0;
+                $late_fee_percent = 0;
+                break;
+        }
+
+        return $this->setLateFee($invoice, $late_fee_amount, $late_fee_percent);
+
+    }
+
+
+    private function setLateFee($invoice, $amount, $percent) :Invoice
+    {
+        if ($amount <= 0 && $percent <= 0) {
+            return $invoice;
+        }
+
+        $fee = $amount;
+
+        if ($invoice->partial > 0) 
+            $fee += round($invoice->partial * $percent / 100, 2);
+        else
+            $fee += round($invoice->balance * $percent / 100, 2);
+
+        $invoice_item = new InvoiceItem;
+        $invoice_item->type_id = '5';
+        $invoice_item->product_key = trans('texts.fee');
+        $invoice_item->notes = ctrans('texts.late_fee_added', ['date' => $this->formatDate(now()->startOfDay(), $invoice->client->date_format())]);
+        $invoice_item->quantity = 1;
+        $invoice_item->cost = $fee;
+
+        $invoice_items = $invoice->line_items;
+        $invoice_items[] = $invoice_item;
+
+        $invoice->line_items = $invoice_items;
+
+        /**Refresh Invoice values*/
+        $invoice = $invoice->calc()->getInvoice();
+
+        return $invoice;
+
     }
 
 }
\ No newline at end of file
diff --git a/app/Utils/Traits/MakesReminders.php b/app/Utils/Traits/MakesReminders.php
index 9754573b401a..1c039de1fa98 100644
--- a/app/Utils/Traits/MakesReminders.php
+++ b/app/Utils/Traits/MakesReminders.php
@@ -190,22 +190,22 @@ trait MakesReminders
             return $entity_string;
 
         //if the invoice
-        if ($client->getSetting('enable_reminder1') !== false && $this->inReminderWindow(
+        if ($this->inReminderWindow(
             $client->getSetting('schedule_reminder1'),
             $client->getSetting('num_days_reminder1')
         )) {
             return 'reminder1';
-        } elseif ($client->getSetting('enable_reminder2') !== false && $this->inReminderWindow(
+        } elseif ($this->inReminderWindow(
             $client->getSetting('schedule_reminder2'),
             $client->getSetting('num_days_reminder2')
         )) {
             return 'reminder2';
-        } elseif ($client->getSetting('enable_reminder3') !== false && $this->inReminderWindow(
+        } elseif ($this->inReminderWindow(
             $client->getSetting('schedule_reminder3'),
             $client->getSetting('num_days_reminder3')
         )) {
             return 'reminder3';
-        } elseif($client->getSetting('enable_reminder_endless') !== false && $this->checkEndlessReminder(
+        } elseif($this->checkEndlessReminder(
             $this->last_sent_date, 
             $client->getSetting('endless_reminder_frequency_id')
         )){