Looking for an easy way to create fundraising letters? This guide and free templates empower you to effectively communicate needs and inspire support!What do you need to include in your donation acknowledgment letter? Tax-exempt status statement: Statement that the organization is a 501c3 tax-exempt organization. Gather all information required to complete the form. Have a valid form of payment. In this post, I'm breaking down how to write a donation letter. 501c3 Determination Letter Request. Each professional fundraising consultant you employ. Fill out the form below for Fundraising Registration and we will get in touch shortly.