We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes. Your gift to the Middlesex Annual Fund provides unrestricted funding to the areas of greatest impact and opportunity for Middlesex High School.Learn how to easily create your donation receipts and the best practices to follow in the year-end receipts to your donors. Middlesex Public School District is located in Middlesex, NJ. Organizations seeking exemption from Sales and Use Tax must complete all steps of this application. When you fill out your tax return this year, you can include all contributions you make to these schools as a deductible charitable contribution.