If you are expecting a $500 refund for claiming your 18 year old as a dependent, you misunderstood. If you claim a dependent who is over the age of 16 you can get the $500 credit for other dependents--it is not a refund. It reduces the amount of tax you owe.
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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