As part of determining the reassessment details for the reassessment period, the eligibility and entitlement engine retrieves the processed ILIs during the reassessment period, creates in memory financial data for the virtual financial components, and compares the financial data to the processed ILIs to determine if any over or underpayments exist. If an over or underpayment is found, the eligibility and entitlement engine creates an over or underpayment financial component and initiates over or underpayment processing. Over or underpayment financial components are once-off with a cover period matching the reassessment period.