How do I add an external account? To sync a non-Betterment account, follow the below steps: Log in to your Betterment account here Click on the "Sync New" button in the bottom right corner. Follow the instructions to sync. Related articles When I sync a non-Betterment account, does Betterment store my username and password? How do I deposit or transfer funds into Betterment? External portfolio analysis assumptions What is your affiliation with Goldman Sachs? What accounts can I open with Betterment?