diff --git a/gui/platform_edit.ui b/gui/platform_edit.ui
index 5e89f0b..e6d1f00 100644
--- a/gui/platform_edit.ui
+++ b/gui/platform_edit.ui
@@ -80,7 +80,7 @@
     <item row="2" column="3">
      <widget class="QCheckBox" name="fund_deal_fee_check">
       <property name="enabled">
-       <bool>false</bool>
+       <bool>true</bool>
       </property>
       <property name="checked">
        <bool>true</bool>
diff --git a/src/main_window.py b/src/main_window.py
index 24a5eea..fed54dd 100644
--- a/src/main_window.py
+++ b/src/main_window.py
@@ -66,7 +66,6 @@ class SIPPCompare(QMainWindow):
     def init_variables(self):
         self.optional_boxes     = self.platform_win.get_optional_boxes()
         self.fund_plat_fee      = self.platform_win.get_fund_plat_fee()
-        self.fund_deal_fee      = self.platform_win.get_fund_deal_fee()
         self.share_plat_fee     = self.platform_win.get_share_plat_fee()
         self.share_deal_fee     = self.platform_win.get_share_deal_fee()
 
@@ -77,16 +76,21 @@ class SIPPCompare(QMainWindow):
             self.plat_name = None
 
         if self.optional_boxes[1]:
+            self.fund_deal_fee = self.platform_win.get_fund_deal_fee()
+        else:
+            self.fund_deal_fee = None
+
+        if self.optional_boxes[2]:
             self.share_plat_max_fee = self.platform_win.get_share_plat_max_fee()
         else:
             self.share_plat_max_fee = None
 
-        if self.optional_boxes[2]:
+        if self.optional_boxes[3]:
             self.share_deal_reduce_trades = self.platform_win.get_share_deal_reduce_trades()
         else:
             self.share_deal_reduce_trades = None
 
-        if self.optional_boxes[3]:
+        if self.optional_boxes[4]:
             self.share_deal_reduce_amount = self.platform_win.get_share_deal_reduce_amount()
         else:
             self.share_deal_reduce_amount = None
@@ -101,7 +105,8 @@ class SIPPCompare(QMainWindow):
         slider_val: int = self.mix_slider.value()
         funds_value = (slider_val / 100) * value_num
         fund_trades_num = int(self.fund_trades_combo.currentText())
-        self.fund_deal_fees = fund_trades_num * self.fund_deal_fee
+        if self.fund_deal_fee is not None:
+            self.fund_deal_fees = fund_trades_num * self.fund_deal_fee
 
         for i in range(1, len(self.fund_plat_fee[0])):
             band = self.fund_plat_fee[0][i]
diff --git a/src/platform_edit.py b/src/platform_edit.py
index 1510695..4f51d58 100644
--- a/src/platform_edit.py
+++ b/src/platform_edit.py
@@ -34,13 +34,13 @@ class PlatformEdit(QWidget):
             self.save_but.setEnabled(True)
 
         self.required_fields = [
-            self.fund_deal_fee_box,
             self.share_plat_fee_box,
             self.share_deal_fee_box
         ]
 
         self.optional_fields = [
             self.plat_name_box,
+            self.fund_deal_fee_box,
             self.share_plat_max_fee_box,
             self.share_deal_reduce_trades_box,
             self.share_deal_reduce_amount_box
@@ -48,12 +48,14 @@ class PlatformEdit(QWidget):
 
         self.optional_check_boxes = [
             self.plat_name_check,
+            self.fund_deal_fee_check,
             self.share_plat_max_fee_check,
             self.share_deal_reduce_trades_check,
             self.share_deal_reduce_amount_check
         ]
 
         self.check_boxes_ticked = [
+            True,
             True,
             False,
             False,