@Sam Hopi wrote:
If I have had a loss $10000 for day trading in 2023; and never filed 3115, what can I do?
You can use the $10,000 loss to offset any capital gains you may have during the 2023 tax year. Then, you can use up to $3,000 of any unused capital loss to offset all other types of income (with the balance carried over to the 2024 tax year).
