Learn how to create customized tax deduction letter for your church - with the help of 2 FREE samples and steps on how Donorbox can help! Nonprofit organizations may qualify for exemption from some Florida taxes.Each tax is separate and distinct and has its own requirements. Gather all information required to complete the form. Have a valid form of payment. Cost, time, and paperwork required to start a nonprofit. Learn how to start a nonprofit in Florida with our free step-by-step guide. Tax letters will be sent to all donors no later than January 31. The main purpose of this letter is to acknowledge a one-time gift or donation made to the church. Completing the federal application for tax exemption is significantly easier with the assistance and support of a professional.