Dependents - Missing or Unlisted Dependents on Form 1040
1
If you are claimed as a dependent on someone else's return, you cannot claim dependents on your own return. If you have inadvertently answered that you are being claimed as a dependent on another taxpayer's return, your dependents will not appear in Box 6c on page 1 of Form 1040.

To correct this, if necessary:
  1. From within your TaxACT return (Online or Desktop) click on the Federal Q&A tab
  2. Click Basic Information to expand the section and then click Dependent on Someone Else's Tax Return
  3. Select No if you cannot be claimed as a dependent on someone else's return

Answering No to the question Can you be claimed as a dependent on someone else's return, such as your parent's return? will result in any dependents already in the return now being listed in Box 6c of IRS Form 1040.