What I don't understand is that if you mail a Form 8453 to the IRS, why do you need to also send a manual copy of the 1099-B when the 1099-B states that it was sent to the IRS. So in essence, the IRS will then have two copies of your 1099-B.
If seems that adding the summary figures in TurboTax and mailing the 8453 and 1099-B to the IRS is really the only option when you have excessive transactions. Using other TurboTax products does not seem to help.
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TurboTax Online can handle up to 1,500 transactions per brokerage account. However, online performance may deteriorate as you get close to this limit.
If you have more than 1,500 stock transactions with a total sales volume of less than ten million dollars, you can switch to the TurboTax CD/Download software (which handles around 2,000 transactions per brokerage) or enter the transactions on Form 8949 using summary data from your broker statements.
