Adding an adult as a dependent gets you the NON-refundable $500 credit for other dependents, which can reduce your tax owed. It shows up on line 19 of your Form 1040.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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