diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 1ea9701..22dbb81 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,7 +12,7 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.ShapPlanner">
         <activity
-            android:name=".MainActivity"
+            android:name=".activities.MainActivity"
             android:exported="true"
             android:label="@string/app_name"
             android:theme="@style/Theme.ShapPlanner">
diff --git a/app/src/main/java/de/miaurizius/shap_planner/MainActivity.kt b/app/src/main/java/de/miaurizius/shap_planner/activities/MainActivity.kt
similarity index 96%
rename from app/src/main/java/de/miaurizius/shap_planner/MainActivity.kt
rename to app/src/main/java/de/miaurizius/shap_planner/activities/MainActivity.kt
index 5b4b217..c288778 100644
--- a/app/src/main/java/de/miaurizius/shap_planner/MainActivity.kt
+++ b/app/src/main/java/de/miaurizius/shap_planner/activities/MainActivity.kt
@@ -1,4 +1,4 @@
-package de.miaurizius.shap_planner
+package de.miaurizius.shap_planner.activities
 
 import android.os.Bundle
 import androidx.activity.ComponentActivity
diff --git a/app/src/main/java/de/miaurizius/shap_planner/entities/Expense.kt b/app/src/main/java/de/miaurizius/shap_planner/entities/Expense.kt
new file mode 100644
index 0000000..b9f3164
--- /dev/null
+++ b/app/src/main/java/de/miaurizius/shap_planner/entities/Expense.kt
@@ -0,0 +1,12 @@
+package de.miaurizius.shap_planner.entities
+
+import java.util.UUID
+
+data class Expense (
+    val id: UUID,
+    val amt: Double,
+    val desc: String,
+
+    val payerId: UUID,
+    val debtors: List<User>
+)
\ No newline at end of file
diff --git a/app/src/main/java/de/miaurizius/shap_planner/entities/User.kt b/app/src/main/java/de/miaurizius/shap_planner/entities/User.kt
new file mode 100644
index 0000000..60f5c05
--- /dev/null
+++ b/app/src/main/java/de/miaurizius/shap_planner/entities/User.kt
@@ -0,0 +1,8 @@
+package de.miaurizius.shap_planner.entities
+
+import java.util.UUID
+
+data class User (
+    val id: UUID,
+    val name: String,
+)
\ No newline at end of file