This free program helps you create a letter to request the return of a security deposit in Minnesota. Before you fill out your letter, you will need to figure out how much interest you earned on your security deposit.Security Deposit Demand Letter – For a tenant requesting to get back their security deposit. Sample. Download: PDF, MS Word, ODT. Learn how to write a security deposit return letter and protect yourself and your tenant. Fill out the appropriate letter. If you need help filling out the letter, call HOME. The letter must include a complete accounting of the resident's security deposit if you aren't returning a portion of it. A security deposit return letter is used after a tenant moves out to relay the status of their security deposit. Mail your income tax return or claim for refund to the address in the Contact Info box.