Only kicks in if you're employed in a software job making more than 50k/yr.
ISA stops after repayment or ten years whichever happens first.
My favorite part of it is the ISA structure, it aligns the incentives between the school and the students. Universities don't have skin in the game, charge outrageous tuition fees and provide primarily signaling (even in the best cases). If Universities had to switch to an ISA model we'd see which ones were actually valuable - if they'd even be capable of adapting.