diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index ecdbef3..1297e28 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -3,7 +3,7 @@ set(Boost_USE_STATIC_LIBS ON)
 find_package(Boost 1.62 COMPONENTS date_time REQUIRED)
 find_package(SQLite3 REQUIRED)
 #find_package(PkgConfig REQUIRED)
-find_package(XLNT REQUIRED)
+find_package(XLNT REQUIRED STATIC)
 find_package(JSONCPP REQUIRED)
 #pkg_check_modules(XLNT REQUIRED xlnt>=1.3)
 #pkg_check_modules(JSONCPP REQUIRED jsoncpp)
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index 1312dfc..29f4efd 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -9,6 +9,8 @@
 #include "sellerdialog.h"
 #include "settingsdialog.h"
 
+#include <utils.h>
+
 #include <excelreader.h>
 #include <posprinter.h>
 
@@ -58,11 +60,15 @@ MainWindow::MainWindow()
         marketplace_->clear();
         setSaleModel();
     });
+
+    ui_.sellerNoEdit->installEventFilter(this);
+    ui_.givenSpinBox->installEventFilter(this);
+
     connect(ui_.actionEditSeller, &QAction::triggered, this,
             &MainWindow::onActionEditSellerTriggered);
-    connect(ui_.sellerNoEdit, &QLineEdit::returnPressed, this,
-            &MainWindow::onSellerNoEditCheckSellerNo);
     connect(ui_.paidButton, &QPushButton::clicked, this, &MainWindow::onPaidButtonTriggered);
+    connect(ui_.givenSpinBox, QOverload<double>::of(&QDoubleSpinBox::valueChanged), this,
+            &MainWindow::onGivenSpinBoxValueChanged);
     connect(ui_.basketView->selectionModel(), &QItemSelectionModel::selectionChanged, this,
             &MainWindow::onBasketViewSelectionChanged);
     connect(ui_.cancelArticleButton, &QPushButton::clicked, this,
@@ -108,7 +114,6 @@ MainWindow::MainWindow()
             &MainWindow::onImportSalesJsonActionTriggered);
 
     readGeometry();
-    ui_.drawbackContainerWidget->setVisible(false);
     setWindowIcon(QIcon(":/misc/kima2.ico"));
 }
 
@@ -151,19 +156,61 @@ void MainWindow::onPaidButtonTriggered()
         dynamic_cast<BasketModel*>(ui_.basketView->model())->finishSale();
         ui_.lastPriceLabel1->setText(lastPrice);
         ui_.lastPriceLabel2->setText(lastPrice);
-        ui_.basketSumLabel->setText("  0,00 €");
+        ui_.basketSumLabel->setText(formatCentAsEuroString(0).c_str());
+        ui_.drawbackLabel->setText(formatCentAsEuroString(0).c_str());
+        ui_.drawbackContainerWidget->setEnabled(false);
+        ui_.sellerNoEdit->setFocus();
         statusBar()->showMessage("Verkaufsvorgang erfolgreich durchgeführt.", STATUSBAR_TIMEOUT);
     }
 }
 
-void MainWindow::onSellerNoEditCheckSellerNo()
+bool MainWindow::eventFilter(QObject* target, QEvent* event)
+{
+    if (target == ui_.sellerNoEdit) {
+        if (event->type() == QEvent::KeyPress) {
+            QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
+            if (keyEvent->key() == Qt::Key::Key_Enter || keyEvent->key() == Qt::Key::Key_Return) {
+                if (keyEvent->modifiers() == Qt::ControlModifier) {
+                    checkSellerNo(true);
+                } else {
+                    checkSellerNo(false);
+                }
+
+                return true;
+            }
+        }
+    } else if (target == ui_.givenSpinBox) {
+        if (event->type() == QEvent::KeyPress) {
+            QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
+            if (keyEvent->key() == Qt::Key::Key_Enter || keyEvent->key() == Qt::Key::Key_Return) {
+                if (keyEvent->modifiers() == Qt::ControlModifier) {
+                    onPaidButtonTriggered();
+                    return true;
+                }
+            } else if (keyEvent->key() == Qt::Key::Key_Escape) {
+                ui_.drawbackLabel->setText(formatCentAsEuroString(0).c_str());
+                ui_.drawbackContainerWidget->setEnabled(false);
+                ui_.sellerNoEdit->setFocus();
+            }
+        }
+    }
+    return QMainWindow::eventFilter(target, event);
+}
+
+void MainWindow::checkSellerNo(bool ctrlPressed)
 {
     using std::regex, std::regex_match, std::smatch;
 
     auto inputText = ui_.sellerNoEdit->text().toStdString();
 
     if (inputText.empty()) {
-        onPaidButtonTriggered();
+        if (ctrlPressed == false) {
+            onPaidButtonTriggered();
+        } else if (marketplace_->getBasket().size() > 0) {
+            ui_.drawbackContainerWidget->setEnabled(true);
+            ui_.givenSpinBox->setFocus();
+            ui_.givenSpinBox->selectAll();
+        }
         return;
     }
 
@@ -192,6 +239,14 @@ void MainWindow::onSellerNoEditCheckSellerNo()
     ui_.sellerNoEdit->clear();
 }
 
+void MainWindow::onGivenSpinBoxValueChanged(double value)
+{
+    int givenInCent = std::round(value * 100);
+    int basketSumInCent = marketplace_->getBasketSumInCent();
+    int drawback = givenInCent - basketSumInCent;
+    ui_.drawbackLabel->setText(formatCentAsEuroString(drawback).c_str());
+}
+
 void MainWindow::onBasketViewSelectionChanged(const QItemSelection& selected,
                                               [[maybe_unused]] const QItemSelection& deselected)
 {
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index ee99fd7..07cb554 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -29,14 +29,16 @@ class MainWindow : public QMainWindow
     void onCancelAllArticlesButtonClicked(bool checked);
     void onAboutQt();
     void onAbout();
+    virtual bool eventFilter(QObject *target, QEvent *event) override;
 
   protected:
     virtual void closeEvent(QCloseEvent* event) override;
 
   private:
     void onActionEditSellerTriggered();
-    void onSellerNoEditCheckSellerNo();
+    void checkSellerNo(bool ctrlPressed = false);
     void onPaidButtonTriggered();
+    void onGivenSpinBoxValueChanged(double value);
     void onImportSellerExcelActionTriggered();
     void onImportSellerJsonActionTriggered();
     void onExportSellerJsonActionTriggered();
diff --git a/src/gui/mainwindow.ui b/src/gui/mainwindow.ui
index 76efbb2..b215010 100644
--- a/src/gui/mainwindow.ui
+++ b/src/gui/mainwindow.ui
@@ -112,7 +112,7 @@
             </widget>
            </item>
            <item>
-            <widget class="QDoubleSpinBox" name="doubleSpinBox"/>
+            <widget class="QDoubleSpinBox" name="givenSpinBox"/>
            </item>
            <item>
             <widget class="QLabel" name="label_4">
@@ -125,7 +125,7 @@
             </widget>
            </item>
            <item>
-            <widget class="QLabel" name="label_5">
+            <widget class="QLabel" name="drawbackLabel">
              <property name="font">
               <font>
                <weight>75</weight>