Question: how much do you have to earn before you don't get tax credits?
Answer: You need to have earned at least $2,500 to qualify for the CTC. Then it phases out for income above $200,000 for single filers and $400,000 for joint filers. If your earned income is above the applicable threshold, you will get a partial credit. As a reminder, tax credits directly reduce the amount you owe the IRS.