Hello,
For tax year 2020, I claimed my brother as a dependent because I was providing more than half of his support. In 2020, he was unemployed the entire year and thus did not file taxes. However, we recently found out that he received a 1099 from Vanguard in 2020 which honestly flew under our radar at the time. He received about 2k in dividend returns and about 20k in "Proceeds From Broker and Barter Exchange Transactions." This was money we exchanged from one mutual fund to another. In light of this, do I need to amend my 2020 return to take him off as a dependent? Needless to say, he will be filing for 2020.
