Round-Ups are calculated from the daily transactions of your primary checking account and any spending accounts (debit and credit cards) you link. You must have a linked primary account to use Round-Ups and you can link as many spending accounts as you like.
Your primary checking account will always be used to make your Round-Ups payments. Even though we’re keeping track of the spare change from your purchases on your linked debit or credit cards for your Round-Ups, the money is not transferred from those cards.