How to apply a credit card fee inclusive of cart and tax total?

[POD253]

We need to be able to apply a credit card fee to customers that is inclusive of cart AND tax total. 

Right now, we have a work around that applies a fee to the cart total - but not taxes. This is also problematic because customers are easily able to bypass this fee option and order with a card anyhow. We are basically operating on honor system, and banking on avoiding human error. 

Has anyone been able to develop a means of allocating tax charges to customers? 

Thank you! 

[Ray32]

Following. What are you currently using in order to charge the CC transaction fee to the customer?

[samnaniprints]

Is there any update on this. want to setup for my store as well. Thanks