Edit, sign, and share acknowledging payment online. No need to install software, just go to DocHub, and sign up instantly and for free.The purpose of letters of acknowledgment is to provide proof that you have received specific documents or a specific type of request. The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes. The Illinois Department of Revenue (IDOR) sends letters and notices to request additional information and support for information you report on your tax return. Learn how to write a proof of rent payment letter for your tenants in minutes. Download our free proof of payment letter to use right away. At least 3 points of documents establishing the Applicant's identity and one document proving residency in the City of Chicago. Investors are not required to fill out an FS Form 1199A. This is how we recommend acknowledging receipt of payment.