Are you referring to the Term column of service listings? e.g. "1 month @ $25.00"? The price shown here is the expected renewal price, at the current time, in its full amount (all taxes, discounts, etc.). If you think this is wrong, can you provide an example scenario that illustrates that point? i.e., package pricing used for the service, taxes that apply, any coupon discounts, etc.
It might be possible to see a different amount when the invoice is created (e.g. off by a cent or something) compared to the renewal price, but it shouldn't be missing a second tax rule.