After you file

You will not know what it means to you until you enter all of your information into the software.   We do not know what you have in box 1---which is really important.   If you earned a low amount of income, then the employer did not withhold federal tax, based on the W-4 you provided to them that indicated how many dependents you have and the anticipated child tax credit you may be getting.  Enter all of your information including the W-2 exactly as it appears.

Enter your dependents in MY INFO.    As for claiming the 19 year old----does the 19 year old meet the criteria to be claimed?     The two younger children should make you eligible for the child tax credit.  You cannot get the CTC for the 19 year old, but you might be getting a $500 credit for other dependents for the 19 year old.

IRS interview to help determine who can be claimed:

https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent

WHO CAN I CLAIM AS A DEPENDENT?

You can claim a child, relative, friend, or fiancé (etc.) as a dependent on your 2024 taxes as long as they meet the following requirements:

Qualifying child

• They're related to you.
• They aren't claimed as a dependent by someone else.
• They're a U.S. citizen, resident alien, national, or a Canadian or Mexican resident.
• They aren’t filing a joint return with their spouse.
• They're under the age of 19 (or 24 for full-time students).
• No age limit for permanently and totally disabled children.
• They lived with you for more than half the year (exceptions apply).
• They didn't provide more than half of their own support for the year.

Qualifying relative

• They don't have to be related to you (despite the name).
• They aren't claimed as a dependent by someone else.
• They're a U.S. citizen, resident alien, national, or a Canadian or Mexican resident.
• They aren’t filing a joint return with their spouse.
• They lived with you the entire year (exceptions apply).
• They made less than $5050 in 2024 (not counting Social Security)
• You provided more than half of their financial support.