Chase will charge you a fee of $34 each time you overdraw your account by more than $5. And once your account is overdrawn by that much, making additional purchases will result in more overdraft fees: $34 each time, no matter how small the transaction is. You can be charged a maximum of 3 Chase overdraft fees per day. But those fees will be refunded if your account balance is overdrawn by $5 or less at the end of the business day on which the overdraft occurs.
However, if your account is overdrawn for 5 consecutive business days, even by $5 or less, a $15 “extended overdraft fee” will be assessed.
For more information, including how to avoid fees, check out WalletHub’s article on overdraft protection.