Try a different tax software provider that will handle larger sub-totals.
OR, if you insist on using TurboTax ---
I) If your cost and proceeds are in the range 10 million to 99 million,
the simplest solution is to break up your total summary entry into two or more parts that are within the amounts permitted.
Then the summary line and grand total can exceed 9,999,999 because TurboTax puts it in there.
You will be able to e-File.
You may want to file on paper anyway when you need to attach transaction details.
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II) If your totals are over 99 million,
then you have to do your taxes modulo 100,000,000 or 10^8.
Assuming your gain is less than 100,000,000 TurboTax will calculate your correct tax.
Then get Schedule D and Form 8949 in fillable PDF format at www.irs.gov
You will replicate the forms but with the true numbers.
Print your tax return and remove the Schedule D and Form 8949 from TurboTax
and replace with your own documents.
You will be filing a paper tax return by US Mail.
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III) Your gain is over 100,000,000.
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Scenario III is unlikely but if you find yourself in that situation,
you can get Morgan Stanley or some other big bank to do your tax return for you.
