1 cut the sub flooring in that small area and replace it so the transition between the carpet and stair tread is level and acceptable.
Top of stairs transition to carpet.
Simple to do cheap complies with code assuming the existing stairs.
Cut away excess foam to clear a space to nail down a tack strip.
3 use some sort of transition piece between the stair tread to carpet when new carpet is installed.
Or you can have laminate on the stairs and need to finish the carpet up to the top stair of laminate.
Installing laminate on top stair to carpet can work both ways.
2 bevel cut the back edge of the stair tread to minimize the height difference.
On the top several steps and adding progressively thicker layers of masonite 1 8 on the fourth one down 1 4 on the third etc.
You d be gradually increasing the height of several treads and the transition at the top of the stairs would be less abrupt.
New carpet will be installed so some sort of transition piece can be used if possible.
Find ideas and inspiration for carpet stairs wood floor transition to add to your own home.
I believe here are my options to correct this.
If you do not have a new tack strip you can use a track strip you removed after pulling up the carpet from your staircase.
Here is a quick step by step guide on how to transition hardwood steps into carpet.
The tacks should be facing toward the back of the landing tread.