When you share an investment/brokerage account and each own 50%, you should report your share of the gains and losses on Form 1099-B as follows:
- Report 50% of the gains and losses shown on the Form 1099-B issued by the brokerage.
- On your your tax return, adjust the amounts reported on the Form 1099-B to reflect only your 50% share.
For more detailed information, you can refer to these resources:
