"Entire Year". I've played with it all. If I put the exact same choices into TurboTax 2019 except that I make his birthdate 1 year earlier (ie, so he would be the exact same age in 2019's turbo tax as 2020's), it correctly states he's a dependent but those same responses in 2020 yields "not a dependent".
This is why I believe it's a bug. Basically, I'm sure it's (the tax law's) going to be an issue for parent's who claimed a child as a dependent in 2019 and so they got the stimulus checks but then in 2020, the other parent is claiming the child and which in turn means they are entitled to the stimulus payments since they're based on 2020 taxes...thus potentially double dipping the credit since it's been said all over the place that if you got too much (ie got it for your 2019 dependent who is not a 2020 dependent), you won't have to repay it.
Anyways, he most definitely should qualify as a dependent because he meets all 6 requirements:
1) He's my wife's son and we file jointly.
2) He lived with us the entire year.
3) He's 17 and he's a full-time student
4) He provides much less than half of his support.
5) He's a US citizen.
6) He's unmarried.
Turbotax just keeps saying he's not a dependent. And all I have to change of the above is from being my wife's son to OUR son and it changes to him being a dependent.
