https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit/who-qualifies-for-the-ea...

Earned Income Tax Credit (EITC) Relief

If your earned income was higher in 2019 than in 2020, you can use the 2019 amount to figure your EITC for 2020. This temporary relief is provided through the Taxpayer Certainty and Disaster Tax Relief Act of 2020.

To figure the credit, see Publication 596, Earned Income Credit.