Unless you had an extension for your 2019 return, it is too late for you to amend your 2019 return to get any additional refund for claiming your child. You can amend 2020 to claim your child if you were the custodial parent for that tax year. Claiming your child for 2020 will mean you get the child-related credits and the recovery rebate credit for claiming the child. Your amended return must be filed by mail; it cannot be e-filed. Use a mailing service to track it so you will know it was received; you will have a long wait of four to six months -- or longer -- for the IRS to process it.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
You can watch for information here:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
Are you the custodial parent? Do you have an agreement with the other parent to allow the other parent to claim them--due to divorce or that you live apart and share custody? Did one of you sign a Form 8332?
If there is a signed 8332 then the custodial parent retains the right to file as Head of Household, get earned income credit and the childcare credit. The non-custodial parent gets the child tax credit for children under the age of 17.
As far as the IRS is concerned, the custodial parent is the one with whom the child spent the most nights during the tax year--at least 183 nights.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
