You can change the payer under Collection -> Associations -> Payers. This will then apply from the beginning of the next month as invoices are created 10 days before the due date. If an older invoice has been established in the name of the previous payer, then a new one must be submitted in the name of the new payer by sending a request to husfelag@islandsbanki.is You will need to specify the new payer, cancel the previous payer, and specify the date when the new payer takes over.