'post-withholding' originates from the combination of 'post-' meaning 'after' and 'withholding' referring to the act of deducting taxes or other amounts from a paycheck.

The term 'post-withholding' evolved from the financial jargon used in payroll and accounting to describe net income after deductions.

Initially, it referred to the process of withholding taxes, but over time it evolved to specifically denote the remaining amount after such deductions.