diff --git a/web-app/src/components/collapse/CollapseActive.vue b/web-app/src/components/collapse/CollapseActive.vue
index b9f8e9a..9e7cbd6 100644
--- a/web-app/src/components/collapse/CollapseActive.vue
+++ b/web-app/src/components/collapse/CollapseActive.vue
@@ -113,7 +113,7 @@ const props = defineProps<{
 
 const showTaxMenu = ref(false);
 const newTaxRateIndex = ref<number | null>(null);
-const taxDue = ref<bigint>();
+const taxDue = ref<bigint>(0n);
 const taxPaidGes = ref<number>();
 const profit = ref<number>();
 const loading = ref<boolean>(false);