Inputting Coinbase 1099-DA in Turbotax and Mailing to IRS

catdelta · ‎March 22, 2026

The 1099-DA from Coinbase told me that 1) the version sent to IRS has only gross proceeds but not cost basis, and 2) my version has gross proceeds and costs.

When I tried to input the transaction in TT Desktop, TT does not allow "various" purchase dates. Then I went back and input the total proceeds and costs instead. A friend of mine used the online version, which accepts various purchase dates when inputting individual transactions.

Afterwards, TT Desktop said that I should mail a copy of 1099-DA to IRS. Is this due to 1) IRS version does not have costs and 2) I did not input individual transactions or both? For reference, my friend's online version (with transaction inputs) did not ask so.

Thank you.

My friend

DavidD66

When you enter summary totals for investment sales (stock, crypto, etc.) that do not have cost basis information reported to the IRS you have to either attach a PDF copy of your transactions (e.g. the Form 1099-DA) to your tax return, or mail a copy along with Form 8646, with the box for "Form 8949, Sales and Other Dispositions of Capital Assets" checked. If you had entered each transaction you would not need to mail a copy of the 1099-DA to the IRS.

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catdelta

Thank you, David. But the totals have both costs and proceeds. Wouldn't the total costs fine?

DianeW777

Yes, you will use the total costs from your statement even though they were not reported to the IRS. Be sure to enter the appropriate purchase date so that you receive the correct tax rate for any long term sales (any that were owned and help longer than one year).