diff --git a/app/Http/Controllers/PreviewController.php b/app/Http/Controllers/PreviewController.php
index 08537427a5d5..a23465d688d1 100644
--- a/app/Http/Controllers/PreviewController.php
+++ b/app/Http/Controllers/PreviewController.php
@@ -29,6 +29,7 @@ use App\Utils\HostedPDF\NinjaPdf;
 use App\Utils\HtmlEngine;
 use App\Utils\Ninja;
 use App\Utils\PhantomJS\Phantom;
+use App\Utils\Traits\GeneratesCounter;
 use App\Utils\Traits\MakesHash;
 use App\Utils\Traits\MakesInvoiceHtml;
 use App\Utils\Traits\Pdf\PageNumbering;
@@ -40,6 +41,7 @@ use Twig\Error\SyntaxError;
 
 class PreviewController extends BaseController
 {
+    use GeneratesCounter;
     use MakesHash;
     use MakesInvoiceHtml;
     use PageNumbering;
@@ -404,23 +406,24 @@ class PreviewController extends BaseController
 
             /** @var \App\Models\Client $client */
             $client = Client::factory()->create([
-                'user_id' => auth()->user()->id,
+                'user_id' => $user->id,
                 'company_id' => $company->id,
             ]);
 
             /** @var \App\Models\ClientContact $contact */
             $contact = ClientContact::factory()->create([
-                'user_id' => auth()->user()->id,
+                'user_id' => $user->id,
                 'company_id' => $company->id,
                 'client_id' => $client->id,
                 'is_primary' => 1,
                 'send_email' => true,
             ]);
 
-            /** @var \App\Models\Invoice $invoice */
+            $settings = $company->settings;
 
+            /** @var \App\Models\Invoice $invoice */
             $invoice = Invoice::factory()->create([
-                'user_id' => auth()->user()->id,
+                'user_id' => $user->id,
                 'company_id' => $company->id,
                 'client_id' => $client->id,
                 'terms' => $company->settings->invoice_terms,
@@ -428,8 +431,18 @@ class PreviewController extends BaseController
                 'public_notes' => 'Sample Public Notes',
             ]);
 
+            if ($settings->invoice_number_pattern) {
+                $invoice->number = $this->getFormattedEntityNumber(
+                    $invoice,
+                    rand(1, 9999),
+                    $settings->counter_padding ?: 4,
+                    $settings->invoice_number_pattern,
+                );
+                $invoice->save();
+            }
+
             $invitation = InvoiceInvitation::factory()->create([
-                'user_id' => auth()->user()->id,
+                'user_id' => $user->id,
                 'company_id' => $company->id,
                 'invoice_id' => $invoice->id,
                 'client_contact_id' => $contact->id,
@@ -454,7 +467,7 @@ class PreviewController extends BaseController
                 'template' => $design->elements([
                     'client' => $invoice->client,
                     'entity' => $invoice,
-                    'pdf_variables' => (array) $invoice->company->settings->pdf_variables,
+                    'pdf_variables' => (array) $settings->pdf_variables,
                     'products' => request()->design['design']['product'],
                 ]),
                 'variables' => $html->generateLabelsAndValues(),
diff --git a/app/Services/Pdf/PdfMock.php b/app/Services/Pdf/PdfMock.php
index cb57315902a6..f552482fe48d 100644
--- a/app/Services/Pdf/PdfMock.php
+++ b/app/Services/Pdf/PdfMock.php
@@ -27,11 +27,13 @@ use App\Models\PurchaseOrderInvitation;
 use App\Models\Quote;
 use App\Models\QuoteInvitation;
 use App\Models\Vendor;
+use App\Utils\Traits\GeneratesCounter;
 use App\Utils\Traits\MakesHash;
 
 class PdfMock
 {
     use MakesHash;
+    use GeneratesCounter;
 
     private mixed $mock;
 
@@ -206,6 +208,20 @@ class PdfMock
      */
     public function getStubVariables(): array
     {
+        $entity_pattern = $this->entity_string.'_number_pattern';
+        $entity_number = '0029';
+
+        if (!empty($this->settings->{$entity_pattern})) {
+            // Although $this->mock is the Invoice/etc entity,
+            // we need the invitation to get company details.
+            $entity_number = $this->getFormattedEntityNumber(
+                $this->mock->invitation,
+                (int) $entity_number,
+                $this->settings->counter_padding,
+                $this->settings->{$entity_pattern},
+            );
+        }
+
         return ['values' =>
          [
     '$client.shipping_postal_code' => '46420',
@@ -370,7 +386,7 @@ class PdfMock
     '$company.phone' => $this->settings->phone,
     '$company.state' => $this->settings->state,
     '$credit.number' => '0029',
-    '$entity_number' => '0029',
+    '$entity_number' => $entity_number,
     '$credit_number' => '0029',
     '$global_margin' => '6.35mm',
     '$contact.phone' => '681-480-9828',
diff --git a/app/Utils/Traits/GeneratesCounter.php b/app/Utils/Traits/GeneratesCounter.php
index 731e39a504ea..39448d02dbb3 100644
--- a/app/Utils/Traits/GeneratesCounter.php
+++ b/app/Utils/Traits/GeneratesCounter.php
@@ -288,7 +288,6 @@ trait GeneratesCounter
      */
     public function getNextProjectNumber(Project $project): string
     {
-        
         $entity_number = $this->getNextEntityNumber(Project::class, $project->client, false);
 
         return $this->replaceUserVars($project, $entity_number);
@@ -412,7 +411,7 @@ trait GeneratesCounter
      *
      * @param      string $pattern
      * @param      string $prefix
-     * @return     string The padded and prefixed entity number
+     * @return     string The padded, prefixed and unique entity number
      */
     private function checkEntityNumber($class, $entity, $counter, $padding, $pattern, $prefix = ''): string
     {
@@ -420,11 +419,7 @@ trait GeneratesCounter
         $check_counter = 1;
 
         do {
-            $number = $this->padCounter($counter, $padding);
-
-            $number = $this->applyNumberPattern($entity, $number, $pattern);
-
-            $number = $this->prefixCounter($number, $prefix);
+            $number = $this->getFormattedEntityNumber($entity, $counter, $padding, $pattern);
 
             $check = $class::where('company_id', $entity->company_id)->where('number', $number)->withTrashed()->exists();
 
@@ -443,6 +438,26 @@ trait GeneratesCounter
         return $number;
     }
 
+    /**
+     * Formats the entity number according to pattern, prefix and padding.
+     *
+     * @param Collection $entity The entity ie App\Models\Client, Invoice, Quote etc
+     * @param int $counter The counter
+     * @param int $padding The padding
+     * @param      string $pattern
+     * @param      string $prefix
+     *
+     * @return     string The padded and prefixed entity number
+     */
+    public function getFormattedEntityNumber($entity, $counter, $padding, $pattern, $prefix = ''): string
+    {
+        $number = $this->padCounter($counter, $padding);
+
+        $number = $this->applyNumberPattern($entity, $number, $pattern);
+
+        return $this->prefixCounter($number, $prefix);
+    }
+
     /*Check if a number is available for use. */
     public function checkNumberAvailable($class, $entity, $number): bool
     {