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.An offer letter from employer on company letterhead clearly stating income verification. Employment. Applicant must be employed. Documents that prove employment include pay stubs, a W-2 form or an offer letter from a new employer. Bring along at least two pay stubs to show your income stability. You should also look back through your apartment application. The most common proof of income is your pay stub or an offer letter from an employer, selfemployed people have access to alternative proofs of income. If an applicant has outstanding debts to a Landlord, evictions or late rent or mortgage payments, it can be grounds for denial. Arizona Property Brokerage.