TurboTax Online is not equipped to handle that large a number of trades.  It is able to handle approximately 500 transactions per brokerage account.

If you have 2000 or fewer transactions per brokerage account you can switch to TurboTax CD/Download. and import the transactions.

If you would like to switch to TurboTax CD/Download, please click here for information on how to do this.

If your total sales amount is less than $10,000,000, you can enter a summary for each category of sales.

Did we ever get an answer to this? I have about 4,200 trades and need a software that will import these trades.

It is acceptable to enter the trades in summary form in TurboTax. The details should be sorted by short-term, one year or less, and long-term, greater than one year.

Then, mail in Form 8453 and your transaction detail within three days of e-filing.

@KathrynG3 

Thank you for explaining this.

I have one further question, is 1099-B an acceptable " transaction detail" attachment to be sent with 8453. Our 1099-B has all the details and our only adjustment are wash sales but it doesn't specifically have the W listed in front of each sale, it has a column that says

Wash Sale
Loss
Disallowed
(Box 1g)

Is this acceptable to the IRS or does the attachment with detail explicitly have to have the W code in front of each wash sale

Thank you very much for your time

Yes, the form 1099-B is an acceptable transaction detail.