Families will receive advanced 1st payments starting July 15, 2021, the rest can be claimed on the 2021 tax return.
To qualify for advance Child Tax Credit payments
Filed a 2019 or 2020 tax return. On that return you must claim the Child Tax Credit.
If you did not file a return there is still a way to receive the payments.
If you have provided the IRS with your info in 2020 to receive the Economic Impact Payment see this link to do so https://www.irs.gov/credits-deductions/child-tax-credit-non-filer-sign-up-tool;
Have lived in the United States the majority of the year or file a joint return with a spouse who lived in the United States the majority of the year
A child who qualifies that is younger than the age of 18 as of December 2021, this child must have a valid Social Security number
Even Though you may have qualified for the credit in 2020, you may not qualify in 2021. The credit has certain income levels that begin to phase out for married and filing a joint return or if filing as a qualifying widow or widower at 150,000; head of household at 112,500; single filer or are married and filing a separate return at $75,000.
To opt out use this link: https://www.irs.gov/credits-deductions/child-tax-credit-update-portal