You can create merchant fees that can be attached to your memberships and packages to be passed along to your clients
Click into Account Settings from the drop down arrow by your name (top right corner) -> Click into the Fees Tab. Click the "+" sign to start creating your fees and taxes to pass along to your clients.
Adding Fees and Taxes
Click the "+" sign to create your fees and taxes you wish to transfer to your clients...once you have created your fees/taxes you can then attach them to your memberships and packages. (You will be asked if you wish to add a fee when you create a package or membership in Client Billing).