IPA: //ˈæftərˌtæks//
KK: /ˈæftərˌtæks/
Remaining amount of money after taxes have been taken out.
The aftertax income is what you actually take home after deductions.
The word 'aftertax' is formed from 'after' (from Old English 'æfter', meaning following in time or place) and 'tax' (from Latin 'taxare', meaning to assess or estimate). The term 'aftertax' refers to the amount remaining after taxes have been deducted.
Think of 'after' meaning following and 'tax' as the amount assessed — so 'aftertax' means what you have left after the taxes are taken out.
No commonly confused words.