A method for tracking credit limits between a first financial institution and a second financial institution is disclosed. Each financial instrument may have one or more tenors. An initial credit limit is assigned to a credited financial institution for each tenor of each financial instrument to be traded. A relationship is assigned to each credit limits on a first plurality of tenors wherein credit extended on one of said tenors reduces the available credit on said other tenors, said credit being reduced in proportion to said preassigned proportions. When the system receives a signal associated with trades between counterparties, the system updates the credit limits between the counterparties in accordance with preassigned proportions.