Hi there,
Also in the Magentos past there were trouble with the wrong calculating style with the taxes.
Elsewhere than for examlpe in the United States, the tax rate should be calculated first in the sum. Not the tax free sum first and after that the calculation with the tax rate. Now it gives wrong expression to the customer about the price.
The good way of doing things is show the tax rated sum and in the end there is also the sum of the taxes. Mentioned in one line.
Thank you,
Kati ("beginner" with the Even Booking)