Gather all information required to complete the form. Have a valid form of payment.This donation is contingent on the CRA Board approval. Donations are for charitable purposes only (e.g. , auctions and raffles). Give Miami Day helps make the vital work of nonprofits possible. In this post, I'm breaking down how to write a donation letter. What documents must be sent? Copy of IRS determination letter; articles of incorporation; copy of deed showing donation of property to the community. 501(c)(3) nonprofits apply using Form 1023 or Form 1023-EZ.