Talking publicly about your income is taboo. Depends on where you are. In my experience it seems to vary quite a bit - generally a complete no-no in the US,

Talking publicly about your income is taboo. Depends on where you are. In my experience it seems to vary quite a bit - generally a complete no-no in the US, a little less extreme but uncommon in the UK, can be talked about among friends/co-workers in France/, topic of casual small-talk in Japan.