How do I deal with payment of an invoice in the AP which are subject to a deduction or addition.

Example, Invoices which are subject to Government Tax (Witholding Tax - % base) these tax are deducted at the point of payment however, when enterig a cheque via AP we enter the cheque amount which is less tax leaving a balance on the invoice representing tax.

The second senario is where there is an invoice in AP, you are paying that invoice by wire transfer/ draft etc. there is a bank charge incurred.

Question: can these charges be entered at the time of applying that payment to the invoice, however charging the expense in the case of "bank charges" and a liability acoount in the case of the "tax"?