The EIC is based on several factors such as age, earned income, adjusted gross income, filing status, whether the taxpayer had no qualifying child, had one qualifying child, or had two or more qualifying children, etc. The Earned Income Credit (EIC) tables can be accessed in the IRS Instructions for Form 1040 and 1040-SR starting on page 47, as well as in IRS Publication 596 Earned Income Credit (EIC), starting on page 31.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.