Monthly income — the total earnings or salary received in one month.
彼の月収は手取りで二十万円だ。
His monthly take-home pay is 200,000 yen.
月収が増えれば生活が楽になるだろう。
If your monthly income increases, life will probably become easier.
業界によって平均月収は大きく異なる。
Average monthly income varies greatly by industry.