Self employed

Not sure what you expect "full credit" to be.  When you claim an adult dependent you get a $500 credit for other dependents that can be used to reduce your tax liability.  It is non refundable.  

 

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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