There is a “lookback” option that allows you to use your 2019 amounts for earned income credit or child tax credit. You can choose whether to use your 2019 amount or your 2020 amount. Choose whichever amount gives you a better tax refund for your 2020 refund.
You can see this and choose in the earned income credit section in Deductions and Credits.
You still MUST enter all of your 2020 income into your 2020 tax return, including any unemployment you received.
