I've been looking into it. First, nothing happens this year because the Jets are sprinting to file the IR form.
But from what I've read retirement is effectively the same as cutting a player in terms of cap. And after the Jets rolled over almost all salary from 2023 and 24 as prorated bonuses, those all would come due the year Rodgers retires or gets cut.
Which, at my current count, would be $63-66 million in dead cap
EDIT: I think they can weasel out of that hard number if they beg Rodgers to ride the pine in 2024, but their only leverage is another $30 million they are going to pay in 2025 which is going to force the issue. Currently in 2025 they have to choose to pay $51 million for 41 year old QB with injury history or cut him for $49 million in dead cap. Or, you know, give him more money up front and add on to $35 million they have in void years.
The Jets really boxed themselves in on this one