“租金收益”常见的英文表达是 “rental income” 。
例如：
The rental income from this property has been increasing steadily over the past few years.（过去几年里，这处房产的租金收益一直在稳步增长。）
We rely on rental income to cover part of our living expenses.（我们依靠租金收益来支付部分生活开支。）