Co-Borrower refers to person or entity jointly borrowing under the same facility and sharing repayment obligation. A co-borrower’s financials, KYC, and legal capacity affect underwriting. Do not confuse with guarantor, who supports repayment but may not receive loan proceeds. In MSME underwriting, it provides context for the borrower, facility, banking conduct or approval conditions and helps the credit officer connect operational data with credit judgement. For example, the item may influence eligibility, documentation, sanction conditions or the credit officer’s comfort even if it is not a ratio by itself. It matters because the term can affect how the proposal is documented, interpreted, approved and monitored after sanction. The common mistake is to read it in isolation; it should be checked against borrower documents, bank statements, financials and policy requirements.