Need funding for your small business? Learn about SBA loans.The SBA offers information on small business loans, grants, bonds and other financial assistance. Instructions for Completing the IRS Tax Authorization Form 4506-T. SBA requires you to complete the IRS Form 4506-T as a part of your disaster loan application. Shareholder loans must be in the form of a written agreement, with defined interest and a repayment schedule. Use this form to document key loan information such as the loan number, the interest rate, the lender, and the borrower. Once you have received your DUNS number, please fill out below and include this form with your loan application or fax at (305) 756-6008. Application completion: Fill out the lender's application form detailing the business and loan request. Applicants will be assisted on a first-come, first-ready, first-serve basis.