Any contribution you make to an IRA, Traditional or Roth, after May 17, 2021 is based on your 2021 taxable compensation, not 2020.
IRS website for deduction limits - https://www.irs.gov/retirement-plans/ira-deduction-limits
IRS website for contribution limits - https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-ira-contribution-li...
