Depending on the account model, it is possible for you to add a shared account in addition to your existing personal account, which will be used by a maximum of two people. The related costs entirely depend on which account model you choose. There are no charges for creating the shared account as such, but for the account model you use in order to have this feature (among others) available. With Change and Zero, you have the option to open a shared account for free. The first card is free for both participants. With Now, you can't open a joint account without upgrading to a Change or Zero account. Here you can only be invited to a shared account. You can find out more on how the shared account works here.