There are two options for importing your Coinbase trade history. You can upload your history via CSV files or import via read-only access API. The CSV process is laid out below.
Note - Coinbase and Coinbase Pro / GDAX are treated as two separate exchanges. If you used both, you need to import your history from each exchange. Here is the guide for importing Coinbase Pro.
*Very important to follow instructions exactly as seen to avoid errors*
Step 1:
Login To Your Coinbase Account
Step 2:
Click on your profile icon and select Tools.
Step 3:
Select the Taxes & Reports tab from the tools menu bar.
Step 4:
Click on the Generate Report button next to Transaction History.
Step 5:
Click Generate Report with the following settings and then download the CSV Report.
Step 6:
Navigate to the Coinbase tab on CryptoTrader.Tax and drag the file you just downloaded into the blue box.