diff --git a/src/accounting-app/views/BalancePage.vue b/src/accounting-app/views/BalancePage.vue
index 1484584..66ec3bf 100644
--- a/src/accounting-app/views/BalancePage.vue
+++ b/src/accounting-app/views/BalancePage.vue
@@ -42,7 +42,8 @@ const pendingFiatCurrency = computed(() => {
   return tx?.fiat_currency ?? null
 })
 
-const balanceIsPositive = computed(() => (balance.value ?? 0) >= 0)
+// Castle API: positive = user owes castle, negative = castle owes user
+const castleOwesUser = computed(() => (balance.value ?? 0) <= 0)
 
 async function loadData() {
   if (!walletKey.value) return
@@ -120,17 +121,17 @@ function formatFiat(amount: number, currency: string): string {
         <div v-if="balance !== null" class="space-y-1">
           <div class="flex items-center gap-2">
             <component
-              :is="balanceIsPositive ? ArrowDown : ArrowUp"
+              :is="castleOwesUser ? ArrowDown : ArrowUp"
               class="w-5 h-5"
-              :class="balanceIsPositive ? 'text-green-500' : 'text-red-500'"
+              :class="castleOwesUser ? 'text-green-500' : 'text-red-500'"
             />
             <span class="text-3xl font-bold text-foreground">
               {{ formatAmount(balance) }}
             </span>
             <span class="text-lg text-muted-foreground">{{ balanceCurrency }}</span>
           </div>
-          <p class="text-sm" :class="balanceIsPositive ? 'text-green-600 dark:text-green-400' : 'text-red-600 dark:text-red-400'">
-            {{ balanceIsPositive ? t('castle.balance.owedToYou') : t('castle.balance.youOwe') }}
+          <p class="text-sm" :class="castleOwesUser ? 'text-green-600 dark:text-green-400' : 'text-red-600 dark:text-red-400'">
+            {{ castleOwesUser ? t('castle.balance.owedToYou') : t('castle.balance.youOwe') }}
           </p>
         </div>