If the application isn't fully completed, you don't need to give any further reason to reject. Learn how to handle rental application rejections legally and avoid potential disputes while maintaining compliance with fair housing laws.Provide a Reason Letter: Select the reason(s) for the rental application denial or include any additional reasons not covered in standard options. Here's a look at the reasons why you can reject a tenant and the reasons why not, as well as other tips for getting the best tenants into your properties. Your letter should have a professional and informative tone, covering exactly why you're denying their rental application. Don't be afraid to tell them why you are denying their application.