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.You need a letter of employment to get an apartment so that you can prove to the landlord that you are employed. A new hire letter is evidence that you have an income moving forward, which is when you will be living in the landlord's property. And that offer letter can be used in place. Of a bank statement and or a paycheck does, because it's right up there with acceptable documents. 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 fill out a rental application, what information is required, and what you will need to provide to secure your next place. The most important source of information about your relationship with your landlord is your rental agreement, whether it is written or oral.