Similarly in the UK going over £80k in income prevents you from claiming child benefit, and going over £100k makes you ineligible for a host of other benefits. A salary bump from 99k to 100k would be very expensive for you if had young children.

Stupidly though, a married couple each earning £99k would be able to use all benefits, but a couple where one earns £101k and the other £20k would lose out.