Sorry about my bad English! I think I qualify as TTS. I have so far this year 600 trades. I am in the green, no losses so far. I have a lot of wash sales. If I elect TTS, the wash sales will not count for 2018? I do my taxes with Turbo tax. How would my broker know my TTS? Thanks
Assuming you filed for MTM with the IRS. File a MTM form with your broker, so thy know to file the correct 1099.
I thought before you file your 2017 taxes, but you should consult an expert. https://greentradertax.com/trader-tax-center/trader-tax-status/
Normally it is REQUIRED to be filed by the tax due date (not including extensions) for the previous tax year. In 2018, that date WAS April 18. One exception I am aware of is for a first time taxpayer, such as an newly formed entity, in which case the MTM election is due within 75 days of inception. There may be other exceptions and/or remedies. Seek professional advise.