diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/LedgerUI.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/LedgerUI.kt
index dad2296..2b1c8d1 100644
--- a/Ledger/app/src/main/java/at/xaxa/ledger/ui/LedgerUI.kt
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/LedgerUI.kt
@@ -69,7 +69,10 @@ fun HeaderCard(modifier: Modifier = Modifier, balance: String, onCategoryButton:
                 elevation = 8.dp,
                 shape = RoundedCornerShape(12.dp),
                 clip = false
-            )
+            ),
+        onClick = {
+            onCategoryButton()
+        }
     ) {
         Row(
             modifier = Modifier
diff --git a/Ledger/app/src/main/java/at/xaxa/ledger/ui/category/overview/OverviewCategoryViewModel.kt b/Ledger/app/src/main/java/at/xaxa/ledger/ui/category/overview/OverviewCategoryViewModel.kt
index 5272fa7..684c5b4 100644
--- a/Ledger/app/src/main/java/at/xaxa/ledger/ui/category/overview/OverviewCategoryViewModel.kt
+++ b/Ledger/app/src/main/java/at/xaxa/ledger/ui/category/overview/OverviewCategoryViewModel.kt
@@ -1,6 +1,7 @@
 package at.xaxa.ledger.ui.category.overview
 
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.lifecycle.SavedStateHandle
@@ -9,7 +10,6 @@ import androidx.lifecycle.viewModelScope
 import at.xaxa.ledger.data.EntryRepository
 import at.xaxa.ledger.data.db.Category.CategoryEntity
 import at.xaxa.ledger.ui.category.add.CategoryListUIState
-import at.xaxa.ledger.ui.category.add.CategoryUIState
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flowOf
@@ -24,6 +24,8 @@ class OverviewCategoryViewModel(
     private val savedStateHandle: SavedStateHandle,
     private val repository: EntryRepository
 ) : ViewModel() {
+    var balance by mutableFloatStateOf(0.0f)
+        private set // Restrict external modification
     var categoryUiState by mutableStateOf(CategoryListUIState())
         private set
 
@@ -40,4 +42,9 @@ class OverviewCategoryViewModel(
 
         }
     }
+    fun calculateBalance() {
+        viewModelScope.launch {
+            balance = repository.calculateBalance()
+        }
+    }
 }