Joint Cash Reserve accounts and joint cash goals are available. If you don’t have an account with Betterment yet, sign up now. If you already have a Betterment investing account, log in now. The sign up flow will prompt you to determine whether you will be the only person using Cash Reserve, or whether you would like a joint account. Betterment on Facebook Betterment on X Betterment Email Share Betterment Clipboard Share Copied!