wrong compared to what?
proceeds and cost basis are not calculated.
That is the data that you enter. gain/loss is the calculated value.
The summary for Coinbase shows 3 things:
1. Total gain or loss
2. Proceeds
3. Cost basis
This is generated by importing a CSV of transactions. eg: Buy, Sell, Interest, Reward, etc.
The proceeds and cost basis are both in the ballpark of $500k, but i didn't trade an amount anywhere near that.
I fear that some sort of rounding error / floating point precision botched the calculation
Resolved.
Instead of downloading from Coinbase from directly using my credentials I used, "Enter another way" and directly input the gains and losses.
I see you're saying you imported a large number of transactions, but the subtotal is wrong.
Yes, this can happen due to rounding errors that result from the way TurboTax does rounding.
To be off by $500,000 sounds pretty unlikely but what do I know.
I've never seen a coinbase csv file.
There must be something strange about the data in your csv file.
post a sample line for a couple of transactions.
also post the header line.
There was nothing strange in the csv; I got it directly from Coinbase.
I narrowed it down to my SHIB transactions.
$500 of SHIB was 12,1 million coins. Before TurboTax compiles the buys and sells into taxable events, the numbers were correct. But as a transaction it basically said i bought $490,000 and sold for the exact same price.
Sadly, there is no way for me to correct TurboTax's bad math