Generally a job offer letter will show your new salary and that will help that you will be financially able to pay rent. If you're interested in an apartment, put in an offer in writing (or email).Spell out all the terms, including "owner pays the broker fee". Often, your employer will send the income verification letter directly to your potential landlord, as requested on your apartment application. Secure your rental with a compelling letter of employment. Expert tips and templates for crafting a convincing document to ease your leasing process. Applying for an apartment? Are any household members employed or self-employed? What's in a proof of income letter? Learn how to write a proof of income letter with our stepbystep guide and use our fillintheblanks template as an example.