If you are generating your tax report and you feel it is not correct, there are a few common errors that users make. Here is a list of them and how to avoid them:
A wallet that you have used with is not connected to your account
An exchange that you have used with is not connected to your account
You are missing some transactions from your transaction history
An internal transfer is not linked correctly and showing as taxable
You have missing costs basis of an asset
Duplicate transactions are present
Your tax settings are not correct
My data is not accurate and I used csv imports for a supported exchange / blockchain