My past salary is an irrelevant information for my potential future employer. If they ask about it, my response would be: "Why would you like to know it?" Any a

My past salary is an irrelevant information for my potential future employer. If they ask about it, my response would be: "Why would you like to know it?" Any answer to this question is bad. If they do not bail out and stop asking at this point, then I bail out. The point is that if I want, I can completely change my way of life by switching to a job which pays 50 % of my current salary. Or 400 % of my current salary. It does not matter. What matters is that it is solely my decision and none of my potential future employer's business. If they want to know my current salary, it is a red flag. I do not care about them knowing it, but there is a high risk that they will use that information to try to make an offer which they think that I ought to consider good. They can offer e.g. my current salary + their negotiating margin and think "hey, we have offered you more than you have now, so you ought to be happy". While in reality, the only person who can responsibly decide whether I am happy about it or not is me. Note that I am not criticizing companies which want to hire for cheap. This is all right. But they need to do it transparently, from the beginning. They should say it clearly and upfront: for this position, our budget is somewhere in this range ... are you interested or not? This is a fair way to go.