How do I open an additional savings account in Alliant Online Banking? Online banking makes it simple to open Supplemental Savings accounts. 1. Near the top right side of the page (the options listed next to the Alliant logo), click on "Explore Products." 2. On the "Explore Products" page, select "Open Now" below the Supplemental Savings tile, then follow the prompts to name your account, add a joint owner if applicable, and fund the account. Note: You may open a Supplemental Savings account with a $0 balance and add funds later. If you have questions about opening a new Supplemental Savings account, send us a secure message in online banking (click "Messages" at the top of any online banking page) or mobile banking (click the talk icon at the top left of the app, then select the "Send a secure message" button) or call us at 800-328-1935.