What does after-tax deduction mean?

after-tax deduction meaning in Law Dictionary

Taking a paycheck from a member of staff to pay for nondeductable expenditures. It decreases net gain for national and state taxes.

after-tax deduction meaning in Business Dictionary

A withholding from an income of a non-deductible cost, particularly union dues, charitable contributions or non-qualified cost savings contributions, that lowers the web earnings in the end applicable state and federal income taxes were deducted.