For your daughter to claim you as a dependent, she would have to furnish over one half of your support. The income you earn is not as important as the support she furnishes to you, as you may have money from savings or social security benefits that you use for support outside of your income earned during the year. The same would apply to you claiming her.
Once she reached age 19, if she is not a full time student, you can only claim her if she earns less than $5,050 per year, and the same would apply to her claiming you.
Support would include things such as the basic necessities of life like food, clothing, medical care, education, transportation, household repairs and maintenance, utilities, etc. You can learn more here .
You can learn more about qualifying as a dependent here: Rules for claiming dependents on Taxes
[Edited 1/24/25 at 9:05 PM PST]
@MichaelS86
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