Scripting is best
Unfortunately, the only way to do this at the moment is with scripting in the reporting center, which would not persist outside of the report (in other words, you wouldn't see it in the project price in the UI, or when you create sales orders, etc.) Such scripting is not very complex once you know how to create a calculated field.
[Alternative: If you're desperate, and I do not recommend doing this, there is currently a bug in 5.2 whereby the Canadian Purchase Tax Code is being applied to the cost of items. You could use Canadian taxes for your project and make this work once you understand how Canadian taxes work. Note that this bug will be fixed once 5.5 comes out, so this is not a long-term solution, and may lead to other complications.]
The long-term solution is of course that we implement this in the software. Towards that end, I've added your name to the list of people who have requested this feature. It is definitely something we'll be looking at for the next major version.
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