量入为出（量入爲出）　

◎ 量入为出 liàngrù-wéichū

(1) [base one‘s expenditure upon one‘s income;live within income; plan one‘s expenditure in the light of one‘s income]∶支出在数量或程度上不超过收入

居家过日子要量入为出

(2) [make ends meet; spend no more than one‘s income; stretch one‘s legs according to the coverlet]∶根据收入情况确定支出限度

并用筹策,计较府库,量入为出。——《三国志·卫觊传》