Download a customizable rental application rejection letter template for landlords or property managers to professionally notify applicants. Your letter should have a professional and informative tone, covering exactly why you're denying their rental application.If the application isn't fully completed, you don't need to give any further reason to reject. You can ask, but they don't have to answer. If an applicant is rejected based on information found on a credit report, the landlord must provide an Adverse Action Notice to the applicant. This is included in the Fair Credit Reporting Act.