diff --git a/README.md b/README.md
index 114a90f..3e8891e 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,10 @@ Same approach for the order/cart display.
 - Scrolling loads more lines progressively
 - Ensures the selected line is always visible (expands count if needed)
 
-### 3. Portrait Mode (6-inch Display)
+### 3. Hide Invoice Button
+Hides the "Invoice" button on the payment stage (Payment Screen) and expands the Customer/Partner button to full width, preventing cashiers from using this button.
+
+### 4. Portrait Mode (6-inch Display)
 
 A dedicated compact layout for portrait-orientation small screens. Designed for devices like 6-inch Android POS terminals where the standard Odoo two-column layout clutters the screen.
 
@@ -123,6 +126,8 @@ pos_ui_optimization/
 │       │   │       ├── order_display_patch.js # Incremental order line rendering
 │       │   │       └── order_display_patch.xml
 │       │   ├── screens/
+│       │   │   ├── payment_screen/
+│       │   │   │   └── payment_screen_patch.xml # Hide Invoice button patch
 │       │   │   └── product_screen/
 │       │   │       ├── portrait_mode_patch.js # Tab state (products/cart/numpad)
 │       │   │       ├── portrait_screen.xml    # Portrait layout XML patch
diff --git a/__manifest__.py b/__manifest__.py
index 5f21a88..570e32d 100644
--- a/__manifest__.py
+++ b/__manifest__.py
@@ -26,6 +26,8 @@ Features
             'pos_ui_optimization/static/src/app/components/order_display/order_display_patch.xml',
             'pos_ui_optimization/static/src/app/screens/product_screen/product_screen_patch.js',
             'pos_ui_optimization/static/src/app/screens/product_screen/product_screen_patch.xml',
+            # Payment screen patches
+            'pos_ui_optimization/static/src/app/screens/payment_screen/payment_screen_patch.xml',
             # Portrait mode — service must load first
             'pos_ui_optimization/static/src/app/services/portrait_mode.js',
             # Navbar display-mode toggle
diff --git a/static/src/app/screens/payment_screen/payment_screen_patch.xml b/static/src/app/screens/payment_screen/payment_screen_patch.xml
new file mode 100644
index 0000000..34d511d
--- /dev/null
+++ b/static/src/app/screens/payment_screen/payment_screen_patch.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="template" xml:space="preserve">
+    <t t-inherit="point_of_sale.PaymentScreenButtons" t-inherit-mode="extension" owl="1">
+        <xpath expr="//button[hasclass('js_invoice')]" position="attributes">
+            <attribute name="t-if">false</attribute>
+        </xpath>
+        <xpath expr="//button[hasclass('partner-button')]" position="attributes">
+            <attribute name="class">button partner-button btn btn-lg w-100 lh-lg text-truncate</attribute>
+        </xpath>
+    </t>
+</templates>