The earned income credit (EIC) is first calculated (actually looked up in a table) on your earned income then it is calculated on your total income (AGI). You get the lesser of the two calculated EIC numbers. See the 2022 EIC table at:
https://www.irs.gov/instructions/i1040tt#idm140702909059168
TurboTax does not use taxable income. It may appear that way because your earned income and taxable income are close to the same.
