TDS threshold per co-owner for rent applies when rent paid individually to a co-owner exceeds the statutory limit. An individual or HUF not subject to audit must deduct tax at source at the specified rate when rent paid to a resident to a payee in a month exceeds the statutory monthly threshold, with deduction due at the earlier of credit to the payee's account or payment. The monthly threshold applies separately to each co-owner where rent is paid individually; deduction is required only for those co-owners whose individual receipts exceed the threshold.