Guarantor should have basically all the same stuff that is requested of you. Your guarantor will fill out an application and provide similar documents to a landlord as you, including photo ID and recent bank statements.This document is an employment guarantor form. How to fill out the Guarantor's Passport Form for Employment Verification? 1. Read through the entire form for understanding. 2. A guarantor is a co-signer who guarantees payment on the lease if it otherwise can't be made. But this is an entirely additional process. A guarantor must fill out an application, provide income documentation, have their credit pulled, and sign your lease. How do I fill this out? To fill out this Guarantor's Undertaking Form, gather all necessary documents and information beforehand.