Project Taxes
You can set the tax behavior of each project in the Tax panel in the main window.

"Use Debt Specific" - The project will have no effect on taxes, and each debt/credit decides its own tax amounts.

"Override Debt Specific" - The taxes selected in the Tax panel will be the ONLY taxes that are calculated for Debt/Credits attached to the Project

"Merge Debt Specific and Project" - A tax will be calculate for a Debt/Credit if it is selected for the Debt/Credit OR the Project.