Filing a 22 yr old not claimed by anyone in 2021 nor a tax return filed. She had a child born in 2021. No taxable income. Filing for EIP only. The system is allowing the full amount of the Child Tax Credit as refundable. I thought there had to be $2500 income for the CTC?   What simple thing am I missing?

If the above is so then 0 income taxpayers can file for the CTC?