Income from work. Like wages on a W2 or a Net Profit on Schedule C for self employment.
Some EIC articles
IRS- Earned Income Tax Credit info
https://www.irs.gov/Credits-&-Deductions/Individuals/Earned-Income-Tax-Credit
Turbo Tax EIC INFO
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/earned-income-cre...
