but-for income

基本解释

Moving away from a reliance on user fees is not only a challenge for China, but for many middle-income countries.
解决依靠病人付费问题不仅对中国，对许多中等收入国家，也都是项挑战。
Life expectancy at age 65 has risen a lot at the top of the income distribution, but much less for lower-income workers.
65岁以上人口的平均寿命在收入分配高端人群中提高了很多，而在低端工人中却提高得极少。
Globalization extends and deepens a capitalist system that has for generations been lifting American living standards — for high-income households, of course, but for low-income ones as well.
全球化扩展和深化了世代以来提高美国人生活水平的资本体系的力量，高收入家庭因此受益，当然，低收入家庭也因此受益。

It might be zero for some people, but it's actually-- it is--the standard rate for people who have not negligible income is 15%.
对某些收益较少的人来说税率是零,但实际上...,对于大部分投资获利的人来说,标准税率是15%
耶鲁公开课 - 金融市场课程节选

Recent research shows that the mortgage interest deduction increases homeownership for higher-income households in some areas but not for other households.
FORBES: Capping Itemized Deductions IS Housing Policy
C-corporations are clearly not for every high-income trader, but some many want to consider using one.
FORBES: Post-Fiscal Cliff Tax Tips For Traders
But demand for health care is income-elastic: as people get richer they spend proportionately more on it.
ECONOMIST: The government paints a clearer picture