He make an error, indeed In fact, the tax we will be a bit lower than your (correct) calculation, because the calculation should be made on 90% of the income o

He make an error, indeed In fact, the tax we will be a bit lower than your (correct) calculation, because the calculation should be made on 90% of the income only. So, the result is 1530 € (there's another insignificant reduction after calculation). And that's an effective 6,6% tax rate.