Show them a copy you signed, but yes. Definitely. You will need to offer proof of employment and guaranteed income.You can also use an official offer letter as proof of income as long as it includes your salary. My SO and I moved from CA to NC 10 years ago. Learn the key elements of a successful apartment offer letter, including job details, rental history, and ways to stand out to landlords. If you've just been offered a new job in a new city and don't have any pay stubs yet, you can submit your job offer letter as well. 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.