TurboTax can import your 1099 information because Wealthfront participates in the TurboTax Partner program. The FAQ below has instructions for importing your 1099 into TurboTax. If you are importing a 1099-B, you'll be prompted to upgrade from TurboTax Deluxe Online to TurboTax Premier Online.
How do I import my 1099?
https://ttlc.intuit.com/replies/3389470
