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Problem
The late fee cap is 25% of principal. But if a borrower has paid off all principal and only interest/late fees remain, the remaining_debt used for late fee calculation includes accrued interest + late fees. This means late fees can compound on themselves — fee on fee — with no cap once principal is zero.
Fix
Change late fee calculation to always use original loan.amount (principal) as the base, not remaining_debt. This ensures the 25% cap is meaningful regardless of payment state.
Problem
The late fee cap is 25% of principal. But if a borrower has paid off all principal and only interest/late fees remain, the
remaining_debtused for late fee calculation includes accrued interest + late fees. This means late fees can compound on themselves — fee on fee — with no cap once principal is zero.Fix
Change late fee calculation to always use original
loan.amount(principal) as the base, notremaining_debt. This ensures the 25% cap is meaningful regardless of payment state.