You may claim them as dependents----as for getting money "back"----you no longer receive the child tax credit for them. You lose the child tax credit in the tax year that the child turns 17. The stimulus checks follow that same rule so you cannot get stimulus checks for them. You get the $500 credit for other dependents for claiming them.
CREDIT FOR OTHER DEPENDENTS
Claiming your 19 year old is "iffy"----when did she turn 19? And was she a full-time student in 2020? If she was not a full-time student in 2020 and had over $4300 of income then you cannot claim her.
Use this IRS tool to determine if you can claim the older daughter.
IRS interview to help determine who can be claimed:
Your daughters can file their own tax returns to seek refunds of tax withheld from their paychecks. The younger one MUST say on her return that she can be claimed as someone else's dependent. You need to determine whether the older girl needs to say yes or no to that question.
not sure what you are asking. if they are working they will have to file their own returns to report their income. under no circumstances do their earnings get reported on your return. so the next issue is can you claim either or both of them as dependents. if so they must so indicate on their returns even if you don't actually claim them
to be a dependent they must either be a qualifying child or a qualifying relative
you can claim him/her as a qualifying child if all these tests are met:
• he/she had the same principal abode as you for more than ½ the tax year. Temporary absences like for school are ignored
• if he/she is not a full-time student, he's/she’s under 19 at the end of the tax year. If a full-time student, he's/she’s under 24 at the end of the tax year.
• he/she hasn't provided over ½ his/her own support
• he/she didn't file a joint return unless there was no tax liability but merely filing jointly to facilitate refund of taxes withheld or estimates paid
or you can claim him/her as a qualifying relative if all these tests are met:
• his/her gross income for 2020 was less than $4,300
• you provided over ½ his/her support
• he/she isn't a qualifying child of another taxpayer