diff --git a/functions.php b/functions.php
index 6ba217cd..9a375f70 100644
--- a/functions.php
+++ b/functions.php
@@ -745,7 +745,7 @@ function shortenClient($client) {
     return strtoupper(substr($shortened, 0, 3));
 }
 
-function roundUpToNearest15($time) {
+function roundToNearest15($time) {
     // Extract hours, minutes, and seconds from the time string
     list($hours, $minutes, $seconds) = explode(':', $time);
     
@@ -755,9 +755,13 @@ function roundUpToNearest15($time) {
     // Calculate the remainder when divided by 900 seconds (15 minutes)
     $remainder = $totalSeconds % 900;
     
-    // If there's any remainder, round up to the next 15 minutes
-    if ($remainder > 0) {
+    // If the total seconds is less than 15 minutes, round up to 15 minutes
+    if ($totalSeconds < 900) {
+        $totalSeconds = 900;
+    } else if ($remainder > 450) {  // If remainder is more than 7.5 minutes (450 seconds), round up
         $totalSeconds += (900 - $remainder);
+    } else {  // Else round down
+        $totalSeconds -= $remainder;
     }
     
     // Convert total seconds to the decimal format
diff --git a/ticket_invoice_add_modal.php b/ticket_invoice_add_modal.php
index 22719d1b..2b53a340 100644
--- a/ticket_invoice_add_modal.php
+++ b/ticket_invoice_add_modal.php
@@ -141,7 +141,7 @@
                                     <div class="input-group-prepend">
                                         <span class="input-group-text"><i class="fa fa-fw fa-balance-scale"></i></span>
                                     </div>
-                                    <input type="text" class="form-control" inputmode="numeric" pattern="-?[0-9]*\.?[0-9]{0,2}" name="qty" value="<?php echo roundUpToNearest15($ticket_total_reply_time); ?>" required>
+                                    <input type="text" class="form-control" inputmode="numeric" pattern="-?[0-9]*\.?[0-9]{0,2}" name="qty" value="<?php echo roundToNearest15($ticket_total_reply_time); ?>" required>
                                 </div>
                             </div>
 
@@ -155,7 +155,7 @@
                                     <div class="input-group-prepend">
                                         <span class="input-group-text"><i class="fa fa-fw fa-dollar-sign"></i></span>
                                     </div>
-                                    <input type="text" class="form-control" inputmode="numeric" pattern="-?[0-9]*\.?[0-9]{0,2}" name="price" value="<?php echo number_format(roundUpToNearest15($ticket_total_reply_time) * $client_rate,2); ?>" required>
+                                    <input type="text" class="form-control" inputmode="numeric" pattern="-?[0-9]*\.?[0-9]{0,2}" name="price" value="<?php echo number_format(roundToNearest15($ticket_total_reply_time) * $client_rate,2); ?>" required>
                                 </div>
                             </div>