The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes. Learn what an acknowledgement receipt is and how to create one for your business (with a template and two examples).What do you need to include in your donation acknowledgment letter? On this _____ day of ______, in the year 20__, before me,. , personally appeared. Please keep this written acknowledgement of your donation for your tax records. How do you fill out an acknowledgment letter?