The $10.08 charge on your credit card consists of a $10 fee and an additional $0.08 in taxes. The fee is incurred when your account goes negative due to exceeding the number of waivers included in your plan. For every 100 waivers beyond your plan limit, there is a charge of $10. In this case, your account went negative by 101 waivers, resulting in a $10 fee. The additional $0.08 represents the applicable tax on the $10 fee.