Hi Louise!
I am assuming that you are referring to corporate taxes, and if I am incorrect please feel free to correct me!
When you post your corporate tax payments, whether they are federal or provincial, you will post the item as a D-, and to your Corporate taxes payable account. If you have separate accounts for federal and provincial taxes (Alberta is a good example of this), then you will need to have a separate account for each, and you will post your payments separately.
Any interest that is paid as a result can be claimed as an expense. You can simply set up an expense account called "Non-deductible interest" to hold these items.
Let me know if you have any other questions! Thanks!
