Since it was phrased as an offer, couldn't you just turn it down? Might it be the kind of offer you can't refuse, you know, with the horseheads in your beds etc.?

Your reduced salary won't incentivize hard work, you'll be demoted to your previous commission targets, you'll be eager to work for your previous salary, you'll get the "raise" again, the salary won't incentivize hard work, and this cycle will continue forever, raising and sinking your salary like some sort of cruel… lava lamp.

Wow! They say Americans are bad at math. Thanks, Sweden, for making us look good!

Same thing happened to my wife. Time to start looking for another job.

Yuck! Start looking for a new job! A place the values their employees won't pull something like that!

I would suggest you speak to your HR.

This is the kind of thing that leads to career management. Where the management part involves managing your boss and their expectations. The situation is usually compounded by the fact that our society mistakes sociopathy as leadership often enough that we have a lot of bad people in management.

bosses do it everywhere. and that's why sales folks just almost not reach their targets...

If it's a raise, how is your salary being reduced?

Know your rights at work folks. This could very well be illegal depending on how OP is employed and the laws in Sweden.