Do i claim my child (who is 19 and supports herself, and does not live with me) as a dependent?

You can not claim your child as a dependent because your child must be met certain criteria set by Canada Revenue Agency, which are mentioned below: -

• You did not have a spouse or common-law partner or, if you did, you were not living with them, supporting them, or being supported by them
• You supported the dependant in 2021
• You lived with the dependant (in most cases in Canada) in a home you maintained. You cannot claim this amount for a person who was only visiting you

In addition, the dependant must also be one of the following persons by blood, marriage, common-law partnership, or adoption:

• your parent or grandparent
• your child, grandchild, brother, or sister under 18 years of age
• your child, grandchild, brother, or sister 18 years of age or older with an impairment in physical or mental functions

For more information about who can be considered as an eligible dependant: - Who is an eligible dependant? (Canada Revenue Agency)

Thank you for choosing TurboTax.