How to fill out the Bank Letter of Guarantee Template? The Letter of Instruction must be signed in the presence of the individual guaranteeing your signature.A bank typically issues a letter of guarantee to inform someone else that the bank guarantees funds or securities for the client. Details of documents enclosed: (please tick all that are relevant). The list below explains what should be in the bank letter. Financial documentation should be included with your international application. Solution: An Out-of-School Zone with excellent programming, fine arts instruction and athletic activities that reinforce school day content.