Filling out your own tax return is not work you get paid for. A Refund is not compensation from working. A refund is a return of your own money from withholding or from refundable tax credits. Nobody is paying you to file your return. Earned income is only W2 wages and a net profit from self employment income on schedule C. It is for work other people pay you.
See IRS pub 596 page 7 for what Earned Income includes
https://www.irs.gov/publications/p596
