@NCperson Is it because they could use 2019 to lookback but didn't?
You can look back and use your 2019 income for the EIC credit instead of 2020 & 2021. How to use the Lookback provision
https://ttlc.intuit.com/community/earned-income-credit/help/how-do-i-use-the-lookback-provision-to-m...
