最常见的2种说法：
high-income people
high-earning people
例句：
1.我的背景是工薪阶层,在这些高收入人群中感到很不自在.
With my working-class background,I feel like a fish out of water among these high-income people.
2.调查显示,在供职于大型跨国公司的高收入人群中,有45%的人是“极限工作者”.
The research estimates 45 per cent of high-earning people working for large global companies have "extreme jobs".