Is there any way I can indicate on my application that I will be using a cosigner? When requested, applicants can enter other co-applicants, co-signers, and guarantors they'll be applying with on their rental application.So, in the event you do not qualify on your own, your landlord may ask you to get a cosigner or a guarantor to complete the rental application. Some properties will accept a co-signer if you do not qualify on your own due to credit, income, or rental history requirements. This guide will provide all the necessary information you need to screen, process, and add a cosigner to a lease. A cosigner can help you get approved for an apartment if you have a poor credit history or are unemployed.