just a user,
There are several reports where you can do this.
I would use the Income and Expense Report. Select the date range and the categories needed. Be sure to click none first in case other items have been selected in the past. The Graphs and Reports are under the Tools tab
Just set the date range you need, select ALL accounts or specific as needed. Set group as needed, then at the bottom click None to deselect everything and over to the right you sill either see TYPE or INDIVIDUAL. If it says TYPE, then you already see a listing of all the categories, if you see BY INDIVIDUAL, click it to reveal the TYPE option and the category listing. Then click GENERATE and your off to the races.
The Tax option is there to work with any categories that you specifially mark as tax related, so it automatically chooses those.
It works well if you want to create specific tax reports. I have set the categories that I need to include in tax reports and then set up a saved report by fiscal year. If I need any new categories for the report I just have to then set them up as Tax related.