Is Recovery Rebate based on 2020 income or 2019 income

In my 2020 TurboTax Federal Income return I cannot find a "Recovery Rebate Credit Worksheet".

I need to find it because the IRS is not allowing any of a TurboTax stipulated amount of $2429.

There seems to be some confusion surrounding whether your refund is based on income from 2019 or 2020.

I need to know because my 2019 income exceeded IRS guidelines for a rebate. My 2020 income however is well within the guidelines. Is TT correct (based on 2020) or the IRS (based on 2019)?

And how do I find the "Recovery Rebate Credit Worksheet.