You don't need to indicate that anywhere. Who are you filing 2018 with? You will need to enter your 2027 AGI to efile2018.
if you used Turbo Tax for 2017.....
How to find last year's AGI
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/00/25947
