Apply for an SBA loan through Texas Capital Bank. We offer a wide range of loan amounts.How to change guarantor on SBA loan to partner that has assets and who runs the business. What Is a Guarantor? In the context of business loans, a guarantor is a person who agrees to repay the loan if the business is unable to do so. Customer: I have an unconditional personal guarantee on a SBA loan and promissory note in Rowlett, TX. (Dallas County). A guarantor agreement is an agreement of a third party to provide assurance of payment in the event the party involved in the transaction defaults. A guarantor agreement serves as additional protection in a loan, making a loan more attractive to potential lenders. How do I fill out SBA Form 1919? Holders' rights will continue in effect as specified in the loan note guarantee and assignment guarantee agreement.