Fundraiser letters are like a typical letter stating what the purpose of the fundraising will do for person or organization. Most donations to nonprofit organization are tax deductible. Ask for a generous donation and thank them for their time and consideration. Explain the specific fundraising event and why donations are so necessary. Always include contact numbers if people have any questions. Informing people about your cause or organization may prove them the opportunity to participate in your fundraiser and help you achieve your fund raising goals.