I think that Lob is referring to all tax and monthly deductions when he mentions 25%. I certainly never received a single tax bill that was anywhere near 25% of my salary. But if I were to count in the monthly deductions (AHV etc) then I could see it creeping up to around that point.

My advice to you is not to worry until you've spoken to someone about your last tax return. I honestly don't think it will be as bad as you think.