(For self-employed and tip-earning individuals). 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. Is using a job offer letter for proof of income to rent an apartment illegal if i have no i Intention of taking the job? Learn how to write a proof of income letter with our stepbystep guide and use our fillintheblanks template as an example. Tax Returns – Request the applicant's W-2. Example of details you'll want is an applicant's name, their rental history, pet information, current employment, and monthly income. Proof of income (recent pay stubs, W2, employment offer letter). The answer to that is yes.