Joint Exposure Aggregation combines all relevant exposures connected to the borrower, co-borrowers, guarantors, group entities, and jointly held facilities. In MSME underwriting, this is important because risk may be spread across multiple accounts but supported by the same cash flows, promoters, or collateral. For example, a proprietor may have one business loan, a vehicle loan, and a guarantee obligation for a related entity; all should be considered while assessing repayment capacity. Aggregation helps determine approval authority, exposure limits, concentration, and overall leverage. It matters because looking at only the proposed loan can understate the lender’s true risk. The common caution is to capture facilities across branches, products, names, and related parties to avoid duplicate or missed exposure.