I think this answer is quite helpful. I was able to import my Schedule D details to TurboTax from my brokers last year and I didn't got any prompt to send mail after completing e-file through TurboTax; however, this year, I found that I could not import my Schedule D details to TurboTax and there were also some trading identified as ‘Wash Sell’ transactions and I got prompt from TurboTax that I have to mail form 8453 with form 8949 or an acceptable Continuation Sheet for Schedule D. I'm quite sure that I just need to send IRS my 8453 form with form 8949 and the 1099-B form with transaction details regarding to those transactions identified as ”Washing Sale“ ?if you see non-zero values in1g column in your 1099-B forms). Here's some more explanation about 'Wash Sale': <a rel="nofollow" target="_blank" href="
https://www.dummies.com/personal-finance/investing/day-trading/understand-the-irs-wash-sale-rule-whe...>
Just for your reference.
