Taxpayer A has owned 100 shares of Y stock for 25 years. The Y stock has a fair market value (FMV) of $100,000 on 12/31/21. As adjusted basis in those shares is $2,000. During the 2020 tax year, in an attempt to capitalize on market volatility, A purchased an additional 100 shares of Y stock for $90,000 on July 18, 2020. In 2021 A sold 105 shares of Y for $105,000 on August 12, 2021.

What is the lowest capital gain A can/should report on As 2021 income tax return and what authority can A cite to support this conclusion?