diff --git a/src/card/services/card.service.ts b/src/card/services/card.service.ts
index 5c2dc4e..4cb0a51 100644
--- a/src/card/services/card.service.ts
+++ b/src/card/services/card.service.ts
@@ -148,11 +148,18 @@ export class CardService {
   async transferToChild(juniorId: string, amount: number) {
     const card = await this.getCardByCustomerId(juniorId);
 
+    this.logger.debug(`Transfer to child - juniorId: ${juniorId}, parentId: ${card.parentId}, cardId: ${card.id}`);
+    this.logger.debug(`Card account - balance: ${card.account.balance}, reserved: ${card.account.reservedBalance}`);
+
     const fundingAccount = card.parentId
       ? await this.accountService.getAccountByCustomerId(card.parentId)
       : card.account;
 
+    this.logger.debug(`Funding account - balance: ${fundingAccount.balance}, reserved: ${fundingAccount.reservedBalance}, available: ${fundingAccount.balance - fundingAccount.reservedBalance}`);
+    this.logger.debug(`Amount requested: ${amount}`);
+
     if (amount > fundingAccount.balance - fundingAccount.reservedBalance) {
+      this.logger.error(`Insufficient balance - requested: ${amount}, available: ${fundingAccount.balance - fundingAccount.reservedBalance}`);
       throw new BadRequestException('CARD.INSUFFICIENT_BALANCE');
     }