cash income; cash earnings
Refers to income received in cash, as opposed to bank transfers or other non-cash payments. Often used in contexts like part-time jobs, side businesses, or tax reporting.
I cover my living expenses with cash income from my part-time job.
If you have cash income, you may need to file a tax return.
収入 is a general term for income, while 現金収入 specifically means income received in cash.
現金 means 'cash' itself, whereas 現金収入 is the income received in cash.
Compound of 現金 (cash) and 収入 (income).