I prepared a 2020 return for a C Corp that made a few thousand dollars. The principle told me that this was the first time in years that he hadn't lost money. I have the 2019 return so I can see that but there is no indication of any carry forward. If I know the loss for TY 2018 and 2019 can I just enter that in the 2020 return or do I need to amend those years.