Negative balances can occur when a transaction posts to your account, but the settled amount is greater than your available Brink's Travel + Expense account balance.
Normally, if a merchant preauthorizes a transaction for an amount greater than the Brink's Travel + Expense account balance, the Brink's Travel + Expense card will generally be declined. However, in rare circumstances, a merchant may process a transaction without prior authorization, or more commonly, a settled amount ends up being greater than the preauthorized amount, and there is not enough available balance in your Brink's Travel + Expense account at the time the transaction is posted.
If this occurs, your account balance will fall into a negative number, and you may be notified to load more funds into your Brink's Travel + Expense account, but you will not be charged an overdraft fee.
For example, say you have $100 available in your Brink's Travel + Expense account balance, and you ring up a $100 dinner bill. So your card is preauthorized for $100. But since you received fantastic service, you decide to leave a $50 tip. When the restaurant transaction settles, the posted amount is actually $150. Since you only had a $100 balance, your balance would fall into the negative (-$50)
While this does not happen often, it is important to keep track of your balance and reload funds as needed. To help track your balance, the Brink's Travel + Expense account holder can opt to receive alerts when the balance in the account falls below a certain threshold.