diff --git a/app/Http/Controllers/V1/Admin/Settings/CompanyCurrencyCheckTransactionsController.php b/app/Http/Controllers/V1/Admin/Settings/CompanyCurrencyCheckTransactionsController.php
new file mode 100644
index 00000000..3f7979d5
--- /dev/null
+++ b/app/Http/Controllers/V1/Admin/Settings/CompanyCurrencyCheckTransactionsController.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Crater\Http\Controllers\V1\Admin\Settings;
+
+use Crater\Http\Controllers\Controller;
+use Crater\Models\Company;
+use Illuminate\Http\Request;
+
+class CompanyCurrencyCheckTransactionsController extends Controller
+{
+    /**
+     * Handle the incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\Response
+     */
+    public function __invoke(Request $request)
+    {
+        $company = Company::find($request->header('company'));
+
+        $this->authorize('manage company', $company);
+
+        if ($company->hasTransactions()) {
+            return response()->json([
+                'success' => false,
+            ]);
+        }
+
+        return response()->json([
+            'success' => true,
+        ]);
+    }
+}
diff --git a/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php b/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php
index 264b0af7..f2c879c6 100644
--- a/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php
+++ b/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php
@@ -17,9 +17,20 @@ class UpdateCompanySettingsController extends Controller
      */
     public function __invoke(UpdateSettingsRequest $request)
     {
-        $this->authorize('manage company', Company::find($request->header('company')));
+        $company = Company::find($request->header('company'));
+        $this->authorize('manage company', $company);
 
-        CompanySetting::setSettings($request->settings, $request->header('company'));
+        $companyCurrency = CompanySetting::getSetting('currency', $request->header('company'));
+        $data = $request->settings;
+
+        if ($companyCurrency !== $data['currency'] && $company->hasTransactions()) {
+            return response()->json([
+                'success' => false,
+                'message' => 'You cannot change currency once transaction is created.'
+            ]);
+        }
+
+        CompanySetting::setSettings($data, $request->header('company'));
 
         return response()->json([
             'success' => true,
diff --git a/app/Http/Controllers/V1/PDF/EstimatePdfController.php b/app/Http/Controllers/V1/PDF/EstimatePdfController.php
index 80e96915..64f65cce 100644
--- a/app/Http/Controllers/V1/PDF/EstimatePdfController.php
+++ b/app/Http/Controllers/V1/PDF/EstimatePdfController.php
@@ -4,6 +4,7 @@ namespace Crater\Http\Controllers\V1\PDF;
 
 use Crater\Http\Controllers\Controller;
 use Crater\Models\Estimate;
+use Illuminate\Http\Request;
 
 class EstimatePdfController extends Controller
 {
@@ -13,8 +14,13 @@ class EstimatePdfController extends Controller
      * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\Response
      */
-    public function __invoke(Estimate $estimate)
+    public function __invoke(Request $request, Estimate $estimate)
     {
+        if ($request->has('preview')) {
+            return $estimate->getPDFData();
+        }
+
+
         return $estimate->getGeneratedPDFOrStream('estimate');
     }
 }
diff --git a/app/Http/Controllers/V1/PDF/InvoicePdfController.php b/app/Http/Controllers/V1/PDF/InvoicePdfController.php
index 07a78f45..6f3c47c9 100644
--- a/app/Http/Controllers/V1/PDF/InvoicePdfController.php
+++ b/app/Http/Controllers/V1/PDF/InvoicePdfController.php
@@ -4,6 +4,7 @@ namespace Crater\Http\Controllers\V1\PDF;
 
 use Crater\Http\Controllers\Controller;
 use Crater\Models\Invoice;
+use Illuminate\Http\Request;
 
 class InvoicePdfController extends Controller
 {
@@ -13,8 +14,12 @@ class InvoicePdfController extends Controller
      * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\Response
      */
-    public function __invoke(Invoice $invoice)
+    public function __invoke(Request $request, Invoice $invoice)
     {
+        if ($request->has('preview')) {
+            return $invoice->getPDFData();
+        }
+
         return $invoice->getGeneratedPDFOrStream('invoice');
     }
 }
diff --git a/app/Http/Controllers/V1/PDF/PaymentPdfController.php b/app/Http/Controllers/V1/PDF/PaymentPdfController.php
index c091e724..fec5fa4b 100644
--- a/app/Http/Controllers/V1/PDF/PaymentPdfController.php
+++ b/app/Http/Controllers/V1/PDF/PaymentPdfController.php
@@ -4,6 +4,7 @@ namespace Crater\Http\Controllers\V1\PDF;
 
 use Crater\Http\Controllers\Controller;
 use Crater\Models\Payment;
+use Illuminate\Http\Request;
 
 class PaymentPdfController extends Controller
 {
@@ -13,8 +14,12 @@ class PaymentPdfController extends Controller
      * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\Response
      */
-    public function __invoke(Payment $payment)
+    public function __invoke(Request $request, Payment $payment)
     {
+        if ($request->has('preview')) {
+            return view('app.pdf.payment.payment');
+        }
+
         return $payment->getGeneratedPDFOrStream('payment');
     }
 }
diff --git a/app/Models/Company.php b/app/Models/Company.php
index 2a3b2908..a0d9fddb 100644
--- a/app/Models/Company.php
+++ b/app/Models/Company.php
@@ -380,4 +380,21 @@ class Company extends Model implements HasMedia
             $model->taxes()->delete();
         }
     }
+
+    public function hasTransactions()
+    {
+        if (
+            $this->customers()->exists() ||
+            $this->items()->exists() ||
+            $this->invoices()->exists() ||
+            $this->estimates()->exists() ||
+            $this->expenses()->exists() ||
+            $this->payments()->exists() ||
+            $this->recurringInvoices()->exists()
+        ) {
+            return true;
+        }
+
+        return false;
+    }
 }
diff --git a/app/Models/Estimate.php b/app/Models/Estimate.php
index f9aa6eb3..5b7c3b8f 100644
--- a/app/Models/Estimate.php
+++ b/app/Models/Estimate.php
@@ -412,6 +412,10 @@ class Estimate extends Model implements HasMedia
             'taxes' => $taxes,
         ]);
 
+        if (request()->has('preview')) {
+            return view('app.pdf.estimate.'.$estimateTemplate);
+        }
+
         return PDF::loadView('app.pdf.estimate.'.$estimateTemplate);
     }
 
diff --git a/app/Models/Invoice.php b/app/Models/Invoice.php
index 396fc116..464390af 100644
--- a/app/Models/Invoice.php
+++ b/app/Models/Invoice.php
@@ -575,6 +575,10 @@ class Invoice extends Model implements HasMedia
             'taxes' => $taxes,
         ]);
 
+        if (request()->has('preview')) {
+            return view('app.pdf.invoice.'.$invoiceTemplate);
+        }
+
         return PDF::loadView('app.pdf.invoice.'.$invoiceTemplate);
     }
 
diff --git a/app/Models/Payment.php b/app/Models/Payment.php
index f0afd2c6..83a17441 100644
--- a/app/Models/Payment.php
+++ b/app/Models/Payment.php
@@ -375,6 +375,10 @@ class Payment extends Model implements HasMedia
             'logo' => $logo ?? null,
         ]);
 
+        if (request()->has('preview')) {
+            return view('app.pdf.payment.payment');
+        }
+
         return PDF::loadView('app.pdf.payment.payment');
     }
 
diff --git a/app/Models/RecurringInvoice.php b/app/Models/RecurringInvoice.php
index 6666ea5d..aa3ecabb 100644
--- a/app/Models/RecurringInvoice.php
+++ b/app/Models/RecurringInvoice.php
@@ -305,9 +305,15 @@ class RecurringInvoice extends Model
             ->setCustomer($this->customer_id)
             ->setNextNumbers();
 
+        $days = CompanySetting::getSetting('invoice_due_date_days', $this->company_id);
+
+        if (! $days || $days == "null") {
+            $days = 7;
+        }
+
         $newInvoice['creator_id'] = $this->creator_id;
         $newInvoice['invoice_date'] = Carbon::today()->format('Y-m-d');
-        $newInvoice['due_date'] = Carbon::today()->addDays(7)->format('Y-m-d');
+        $newInvoice['due_date'] = Carbon::today()->addDays($days)->format('Y-m-d');
         $newInvoice['status'] = Invoice::STATUS_DRAFT;
         $newInvoice['company_id'] = $this->company_id;
         $newInvoice['paid_status'] = Invoice::STATUS_UNPAID;
diff --git a/database/migrations/2022_03_03_063237_change_over_due_status_to_sent.php b/database/migrations/2022_03_03_063237_change_over_due_status_to_sent.php
new file mode 100644
index 00000000..a87a7351
--- /dev/null
+++ b/database/migrations/2022_03_03_063237_change_over_due_status_to_sent.php
@@ -0,0 +1,35 @@
+<?php
+
+use Crater\Models\Invoice;
+use Illuminate\Database\Migrations\Migration;
+
+class ChangeOverDueStatusToSent extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $overdueInvoices = Invoice::where('status', 'OVERDUE')->get();
+
+        if ($overdueInvoices) {
+            $overdueInvoices->map(function ($overdueInvoice) {
+                $overdueInvoice->status = Invoice::STATUS_SENT;
+                $overdueInvoice->overdue = true;
+                $overdueInvoice->save();
+            });
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}
diff --git a/resources/scripts/admin/stores/recurring-invoice.js b/resources/scripts/admin/stores/recurring-invoice.js
index cd0ee5eb..ece01072 100644
--- a/resources/scripts/admin/stores/recurring-invoice.js
+++ b/resources/scripts/admin/stores/recurring-invoice.js
@@ -40,12 +40,12 @@ export const useRecurringInvoiceStore = (useWindow = false) => {
         { label: 'Every 30 Minute', value: '*/30 * * * *' },
         { label: 'Every Hour', value: '0 * * * *' },
         { label: 'Every 2 Hour', value: '0 */2 * * *' },
-        { label: 'Twice A Day', value: '0 13-15 * * *' },
+        { label: 'Every day at midnight ', value: '0 0 * * *' },
         { label: 'Every Week', value: '0 0 * * 0' },
-        { label: 'Every 15 Days', value: '0 5 */15 * *' },
-        { label: 'First Day Of Month', value: '0 0 1 * *' },
+        { label: 'Every 15 days at midnight', value: '0 5 */15 * *' },
+        { label: 'On the first day of every month at 00:00', value: '0 0 1 * *' },
         { label: 'Every 6 Month', value: '0 0 1 */6 *' },
-        { label: 'Every Year', value: '0 0 1 1 *' },
+        { label: 'Every year on the first day of january at 00:00', value: '0 0 1 1 *' },
         { label: 'Custom', value: 'CUSTOM' },
       ],
     }),
diff --git a/routes/api.php b/routes/api.php
index 784760ea..b81cbd79 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -67,6 +67,7 @@ use Crater\Http\Controllers\V1\Admin\RecurringInvoice\RecurringInvoiceFrequencyC
 use Crater\Http\Controllers\V1\Admin\Role\AbilitiesController;
 use Crater\Http\Controllers\V1\Admin\Role\RolesController;
 use Crater\Http\Controllers\V1\Admin\Settings\CompanyController;
+use Crater\Http\Controllers\V1\Admin\Settings\CompanyCurrencyCheckTransactionsController;
 use Crater\Http\Controllers\V1\Admin\Settings\DiskController;
 use Crater\Http\Controllers\V1\Admin\Settings\GetCompanyMailConfigurationController;
 use Crater\Http\Controllers\V1\Admin\Settings\GetCompanySettingsController;
@@ -394,6 +395,8 @@ Route::prefix('/v1')->group(function () {
 
             Route::post('/settings', UpdateSettingsController::class);
 
+            Route::get('/company/has-transactions', CompanyCurrencyCheckTransactionsController::class);
+
 
             // Mails
             //----------------------------------