@Opus 17 - see my post above...
<<Even if your entire $20,000 of income is earned from working, it is likely that you have reached the maximum amount of additional child tax credit you can receive>>
OP states she is ineligible. I'll take that as 'zero' credit, which is not correct at $20,000 of earned income.
Based on 2 children under 17 and filing HOH, the additional CTC should be around $2625. OP certainly qualifies for the credit at $20,000 of earned income. It's just not $4,000.
