And if they refuse at first, they will often accept if you offer to pay the first few months of rent in advance. Generally a job offer letter will show your new salary and that will help that you will be financially able to pay rent.In California, you'll need to fill out a form that covers your rental and employment history, income details, and references. Learn how to fill out a rental application, what information is required, and what you will need to provide to secure your next place. Before asking your employer to write the letter, have your landlord outline exactly what they need in the letter. Where do you fill out a renter's application? There are a few ways to fill out a rental application, depending on the landlord or property owner's preference. You should also have the tenant upload a W2, pay stub, or offer letter in your rental application. Who Should Fill Out An Application Form in California? All prospective tenants over the age of 18, applying to a property, should fill out a rental application.