I don't know if it will work, but I entered a positive "pension" (ie, rental income) starting in 2015 and a second equivalent negative pension "starting" in 2017 and FIRECALC seems to have accepted the entry. Don't know if that will handle your interim rental income or not, but something to try. You can also enter a lump sum to sell your rental income property and what year in Portfolio Changes - as you probably already know. Good luck...