Here's what you need to do
The first step is to download all your data from Coss and upload them into Koinly. There are a couple of ways you can do that:
- As Coss has an API, the easiest way to import everything is to simply add your read-only API keys (API key, API secret). Then Koinly will download your history automatically, and you are ready to create your tax document.
- If you don't have access to your API keys, you can also import transactions by importing your CSV files.
- If the above method(s) is not possible for you, you can even add the transactions manually through Koinly's web interface.
Note that if you decide to use CSV files, you have to make sure to import your deposits/withdrawals and trades for ALL years and not just the current one!
That's it. Don't forget to tag your airdrops/forks so they show up as Income on your generated cryptocurrency tax reports!