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@dkh wrote:

 As a side note,  I'm curious as to why the client couldn't claim their child initially but now they can.  🤔

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We have the real answer (where's the fun in that?)  But here's a hypothetical:

"Child" age 25 lives at home, supported by Mom and makes $2K on a W-2 job and $10K on unemployment.  Filed a return in February claiming self, AGI=$12K, TI = $0 but gets full RRC.

Fast forward to now.  Child now meets all of the tests to be a QR of Mom (Gross income is now <$4,300).

Aren't taxes fun?!?