If I held shares of a specific stock since 2016 in one account (let's say Fidelity) and would like to day trade the same stock in another account (E-trade) would the cost basis be treated separately between the accounts?
1/1/2016 Purchase 100 shares in Fidelity at $10
1/1/2020 Purchase 5 shares in E-trade at $20
1/5/2020 Sell 5 shares in E-trade at $30
Will the basis of the sale be $10/share or $20/share?
Would the above example show a profit of $50 or $100?