ㄌㄧㄤˋliàngㄖㄨˋㄨㄟˊwéiㄔㄨchū

  1. 根據稅收多寡制定支出限度禮記·王制》:國用以為。」泛指根據收入斟酌開支三國志··魏書·》:府庫量入為出。」·〉:何若量入為出?」」。

to assess one's income and spend accordingly (idiom)​; to live within one's means, You can only spend what you earn.