Yep, as long as it states start date and salary you're good. I'm a leasing agent and do this all the time.Generally a job offer letter will show your new salary and that will help that you will be financially able to pay rent. Learn how to write a proof of income letter with our stepbystep guide and use our fillintheblanks template as an example. The landlord should always require a prospective resident to fill out a rental application and may collect a fee to cover the costs to screen an applicant. Proof of income, like recent pay stubs or a job offer letter, helps show they can afford the rent. Credit reports may also be required. What's in a proof of income letter? Mention your name, the type of job you do, and why you're interested in the apartment.