I did not notice where "twice" became 20% in the course of this discussion but I agree, it's hard to estimate the maximum affordable salary with 20% precision.

I did not notice where "twice" became 20% in the course of this discussion but I agree, it's hard to estimate the maximum affordable salary with 20% precision. It's quite easy to estimate within 100% though if you had been in the field long enough. More importantly, it does not even have to be in any error band as all it takes to suffer from anxiety over being paid too much is to believe your own estimate. It is not worth it for me as there are plenty of jobs where I'd get just as much or more and be confident the company can afford it.