Piggy bank

Many contemporary banking systems offer savings features that allow users to establish dedicated accounts—commonly referred to as “piggy banks”—into which funds can be deposited manually or automatically via a rounding function. For instance, a transaction of €1.53 would trigger an automatic transfer of €0.47 to the designated account, effectively rounding the expenditure to €2.00.

It would be beneficial to implement a comparable capability within the application: users could designate an account as a savings target and configure other accounts to automatically generate a transfer to that target upon each recorded transaction.