Here's what you need to do
The first and usually only step is to download all your transactions from Coincheck and import it to Koinly. There are a couple of ways you can do this:
- As Coincheck has an API, the fastest way to do so is to just add your read-only API keys. Then Koinly will sync your transactions automatically, and you can generate a tax form.
- If you don't have access to your API keys, you can also import transactions by importing CSV files.
- If you only have a few transactions and the above method(s) are not possible for you, you can also add the transactions manually via Koinly's web interface.
Note that if you decide to import CSV files, you need to make sure to import your deposits/withdrawals and trades for ALL years !
That's all you have to do. The only other thing to be vary of is to tag your airdrops/forks so they show up as Income on your generated cryptocurrency tax documents!