I'm filing for my 17 year old child. I've already claimed her on my taxes. I cannot find where to input the information that she is a dependent on someone else's taxes.

[KeshaH]

In the personal info section, on the screen where you add her state of residence, there are several statements with check boxes. The third one says "Another taxpayer can claim me as a dependent on their tax return". Check that box.

[xmasbaby0]

MY DEPENDENT HAD A JOB

If your dependent has a W-2 for his after-school job, summer job, etc. you do not include the information on your own return. You can still claim your child as a dependent on your own return.  He/she can file his own return for a refund of some of his withheld wages from boxes 2 or 17 (he won’t get back anything for Social Security or Medicare), but MUST indicate on it that he can be claimed as a dependent on someone else’s return.  (Supervise this closely or prepare it for him!)

If your dependent’s earnings were over $400 and were reported on a 1099Misc or 1099NEC then he must file a return and pay self-employment tax for Social Security and Medicare.

You might also want to use free software from the IRS Free File versions:

https://apps.irs.gov/app/freeFile/