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.Formally accept a job offer with our job acceptance letter template. Craft a professional job acceptance letter to start your new role positively. Applying for an apartment? You can also use an official offer letter as proof of income as long as it includes your salary. Learn how to write a proof of income letter with our stepbystep guide and use our fillintheblanks template as an example. What's in a proof of income letter? Applicants can request an employment verification letter directly from their employer. Looking for a renter cover letter to get your rental application noticed?