Subordination of collateral requirement letter for physical disaster loan servicing action request packages. The three main categories of acceptable collateral for SBA loans are real estate, equipment, and inventory.Most SBA loans require some form of physical collateral, such as real estate, equipment, inventory or accounts receivable. All SBA loans require some form of collateral from the borrower. Lenders of SBA loans need to meet the administration's minimum requirements. Uniform Commercial Code (UCC) establishes a standard for recording liens across the country.