Check headroom clearance and the floor-opening length you need so the stair maintains the code minimum all the way up.
Headroom is the vertical clearance measured from the tread nosing line. It is most often pinched at the floor opening at the top of the stair. This calculator gives the code minimum and the opening length needed so a climber clears the floor edge above all the way up.
The IRC requires at least 80 inches (6 feet 8 inches) measured vertically from the tread nosing line, at every point along the stair.
Vertically, from a line connecting the tread nosings up to the ceiling or floor structure above. Inspectors check it along the whole flight, not just the ends.
Lengthen the floor opening, move the stair start point, or reduce the pitch so it reaches the opening sooner. Headroom is set by framing, so fix it at design stage.