TurboTax Desktop doesn't import .csv files.
If the conversion to .txf fails also, either your converter is bad , or the coinbase datafile is bad.
instead format the csv using a spreadsheet and use the Summarize option. Enter only your total proceeds and cost for each sales category into Turbotax.
IRS requires each transaction to be listed on Form 8949, or on your own forms (e.g. spreadsheets) which have the same information and in the same manner as Form 8949.
Either way, if you choose to summarize, you have to mail the transaction details to the IRS within three business days of IRS accepting your tax return.
