In TurboTax, when you are in the earned income credit section, you will be asked if you want to use last year's earned income to calculate the credit. I encourage you to say yes and enter your 2019 earned income. If your earned income was different in 2019 than in 2020, you may get a higher EITC credit by using 2019 earned income. Try it both ways in TurboTax and see what works best for you.
For more information see EIC Lookback
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