Is there a way I can amend the amount manually?
The amount I owe is 9% of my total tax liability (so I fulfilled the 90% requirement) and I also paid 160% of my last years tax liability (which fulfills the 110% of previous years tax for 150k+ income). I also filled out the Other tax situations > Underpayment penalty section. However, TT is still calculating that I owe underpayment penalty + interest.